Document 3J7Xe2X5m2rbKvzRMGYz3L1oD

I ? ^ i t* hot( - rore yasKi 206*(.AAJi ^fe^HCANir inuus (24) Formulation of sea! mixes 1:1 Standard testing of rubber seals sloes not give a characteristic picture of their service behaviour. I he fullest correlation with wear in laboratory tests is given by the tear resistance and abrasion trcforc and after immersion in oils. It is proposed that all the mechanical testing be carried out according to GOST specifications. On the basis of the method indicated for preliminary assessment of the properties of the seals, for reciprocal motion with high pressure, and of those working under high friction, mixes arc formulated on a base of nitrile rubber with polyvinyl chloride and asbestos fibre. (25) Sheet material for floors anil walls " This material is made from a composition containing a tiller such as asbestos, limestone, lead carbonate, barytes and cork, pigments as desired, and a plasticized copolymer of vinyl chloride and viinlidcnc chloride. A suitable plaslici/ci for the copolymer is tricrcsvl phosphate, which may be extended with a mineral oil. The plasti cized copolymer comprises 24 to 50 per cent of the total mix. (26) Delay cables The core of a delay cable comprises an inextensibL base member of dielectric material such as linear polyamide, asbestos, or glass fibre over which is a mixture of finely divided magnetizable material and a dielectric binder. This binder may be a synthetic plastic such as polyethylene, polyvinyl chloride, polyurethane, or poly/.vobutylcnc. The inner conductor is wound on this core. Such a cable has uniform electrical characteristics along its length. (27) Beater saturation of asbestos fibres ,r' In treating asbestos with latex, natural or synthetic, some con stituents of the asbestos arc dissolved out and interfere with the adequate penetration of the rubber into the fibres. The condition is largely corrected by treating the asbestos slurry, before adding the latex, with a sequestrant, such as ethylene diamine tctra-acctic acid. (28) Puncture sealing composition 47 The composition comprises a mixture of filler (powdered mica or other lamellar material 60 to 100 per cent, asbestos or other fine fibrous material 0 to 40 per cent, human hair or other coarse fibred material 0 to 5 per cent); a gelatinous medium (containing one or more of the following: bentonite, water-dispersible gums, stearic or other partial esters of a polyhydric alcohol, water); a humectant (c.g. glycerol); a corrosion inhibitor (sodium benzoate); a bacteri cide; and a fungicide. AS'IVIOS IN till Pl.ASTICS INDUSTRY 207 (2'M I 'i of rubber in pus-main joints A summary of Report No. IGU/3-55 to the 6th International C ongress of the Gas Industry, by the Austrian Gas Association, deseiibes the use of rubber for scaling gas-main joints. Various tvpes of joint vita rubber rings, and joints lor cast-iron, steel, and asbestos cement pipes, arc described in detail and arc illustrated. (30) Scaling strips flic scaling st ip is carried by one member to be joined and either engages the second member or lies sufficiently close to it to provide a gooil seal in combination with a series of spring clips for gripping the sealing strip and the member on which it is mounted. The sealing strip is in the form of an inherently resilient strip-like com ponent bent transversely into substantially V or U section and has a covering of asbestos cloth or synthetic rubber. (31) Deposition of tacky impregnating agents on ceUulosic fibres r,n I hese inventions arc designed to prevent the formation of rubber clots when latex, natural or synthetic, is used to impregnate fibres. such as ccllulosic fibres, leather, or asbestos fibres. A list of anticlotting agents is given, for example sodium octyl sulphonatc and sodium butyl naphthalene sulphonatc. REFERENCES I). V. Rosato. `Asbestos Reinforcement', Mail. Plast., 33. 140 (1956) Johns Mamillc Corpn. Brochure F.I.. 39A Plastic I louring Potential-, Robb. Plast. Age. 35. 280 (1954) tbilisli Patent fSl.803. Composition Sheet Mntrrioi. Congolcnm Nairn Inc. Itiitish Patent 682.169. Improvements in or Relating to the Proitnction of 1 tin mophotie C ompositions. Semtex ltd. Itiitish Patent 710.046. Floor-tile Composition of Improreil Properties. Staml.ii,1 Oil I cvclopmcnl Co. British Patent *27.393. Agglntinotnl FUnous Sheet Material. Semtex I.td. Resin asbcsto; Composition', Modern Plasties Encyclopedia, I, 85 (1947) The Southamp on l aunch and Boat Company Ltd. Private Communica tions ` Reinforced Plastics for Aircraft Construction', Plastics, Land., 16,300(1951) .1. E. ( ' m `Potential Efficiency of Structural Plastics', J. R. aero. Soe. (Sept. 12. * Drop i ans .or Aircraft Moulded in Phenolic Asbestos'. Brit. Plast., 28, 60 (P>SS) British Patent 707.946. Asbestos Felts, Cape Asbestos Co. Ltd. `Asbestos Fibre in Industry', Fibres, 16, 5 (1955) V. A. Ward. `Compression and Transfer Moulding. Melamine l orm| aldehyde Asl'C'tos'. Modern Plasties Encyclopedia, 44 (Sept. 1954) 16 I . Jones. Mir Illation of Rotating Electrical Machinery', Eng. Elect. I Dee. P>53) EXHIBIT GE-59 : ' I , j ,j ,: ]| 'i i 208 inorganic i miu s 17. `Inorganic Plastics', Modnn Pta\tics I nc\-ctopedia, 400 (|954) IX. `Cold-Moulded Otganic Plastics*, Modern Plasties Eat i topedia. 452 (|05l> 19. British Patent 6X2,151. `Packing Ring*, Turner Brothers Asbestos Co. 20. Armstrong Cork Co., Rev. Sri. lastruni.. 2.1. 5H2 (|052) 21. Piad. />/vg, 2.1, 104 (1052); Mot tad. Res. Assn. Ah\.. Abstuct 5>44 (Aug 1052) 22. British Patent 680,065. Kupfer-A best Co., Gustav Bach. inv. A. Klein ami V Bach 21. British Patent 6X4,OSS. N V, Ondcr/ockings Instilimt Rcseatch 24. U.S. Patent 2,617,120. Delaware Research anil Development Cotpn.. inv. C. L. Pct/c 25. I*. I. du Pont tie Nemours ami Co. Inc., Rubber Chemicals l)i\ision. Neo prene Notebook No. 5.1, .141 (105.1) 26. Pirelli-General Cable Works l td.. Chem. fee. 69. 2.14 (lost) 27. f rench Patent 1.024,.174. Socielc Pram;aise dc l/Amiante (Appl. 7.`>.50) 28. Argus Chemical I nhorntory. Inc.. 7'trh. Raft., .1 (1054) 20. I-.C. Pra/cr. Machine Design, 157 (Nov. 1054) .10. U.S. Patent 2,702.770. Raybestos Manhattan Inc., inv. R. | Stock .11. British Patent 7.12,007. T. I. du Pont dc Nemours and Co. Inc. 32. British Patent 732,476. Rein/ Dichinncs. (i.m.b.tt. 33. II. Herbert. Abstract. Prakt. Chetn., 6, 276 (1055) 34. British Patent 742.231. K. Klinger ami II. I ohr 35. British Patent 743.452. Raybestos Co. 36. British Patent 745.055. Aimstrong Cork Co. 37. W. T. Henley's Telegraph Works, l td.. Catalogue lr (2nd cd.. 30 (1055)) 38. U.S. Patent 2,716,034. Crane Packing Co., inv. M. M. Main 39. Canadian General Tower Co. Ltd.. Canad. Phut.. 36. 40. 48 tM.iy 1056) 40. Socttle lc Joint Prancaisc. Publication 2.55.10 (Bc/ons. 1055) 41. I. T. Tnranenko. *Proizvodstov i Primcncnic Sintcticbeskikh l.atiksov*. VNITO Rc/inslichikov, 71 (1953); Ref. 7/ntr. Khitn.. Abs. 5128 (1056) 42. S. A. Solvie. Publication l).Te.J7. (Brussels, r. 1056) 43. S. A. Pavlov and M. S. Monastyrskaya. /.egk. Prom.. No. 8, .15 ( 1055); Ref. 7.hur. Khitn., Abs. 37,526 (1056) 44. British Patent 761.238. Semtex I Id., in. I.. II. Griffiths and W. Saul 45. U.S: Patent 2.756,304. Ilackcthal Draht- mid Kabcl-Wcrkc A-G., inv. J. Sieven and I:. SchcfTlcr 46. U.S. Patent 2,759,813. Armstrong Cork Co.. inv. U. A. I cighlcv. .It. 47. British Patent 767,168. p. A. Ladner. R. P. Iharralt. and P. II Worn! 48. W. W. Ware. Gas limes. 88, 35, 40 (10.56) 40. British Patent 767.004. T. J. R. Bright 50. U.S. Patent 2,769.711/3. American ( vannmid Co., inv. I. II. WilsonI I UR I ill R III ADI N(. N. P. Wahl. 'Investigation of I leal Resistant Polyester I atuin.ilcs*, Wnclil An Development Center Technical Rcpoit 55 342 tAttg. 1055) T. Callinan. `Pour Inorganic Papers', Mater, taut Met/t. (Dee. 1055) G. Lubin. `Tillers and Reinforcements' (Hassons Industries Corpn.). Pratt. Fjt%n% (Dee. 1955) J. B. Campbell. `Asbestos-Reinforced Imv Pressure laminate*, Motet taut Meth. (pcb. 1956) `What's New in Reinforcements?', Mod. P/ast. (Pcb. 1056) AStltSloS IN INI PLASTICS INDUS'! KY 200 ` Pim|m tin's ol I ibious \sbeslos in Reinfotved Plastic Parts and leclt>i<|ues ol I abticationPicpiint ol I lib Anmtal Technical Contcrcncc of S.P.I (Ich. I>5f,| .1 Hioiksien. * Non Glass Heinfoveement for Plastics', ./. Soc. flast. I'.nets (Match P>5r) Asbesltts I cits in (Mass Rcinlorccd Plastic I aminates'. Bu. Ships Repmt No. 4*>m) () 27(Repoit No. I ((April 1056) `Asbestos Reinforcements lor Plastic I aminates', J. Stir. Ptasf. i'nxrs (Aug. 1056) `Asbestos Reinforcements*. Madera Plasties Encyclopedia. 313 (Sept. 1056) R I. Mug'"'*. Jr. `Meat Resistant Honeycomb'. S.A.M.P.P. (Jan. 1057) K. M H< ml R. P. Porsberg. `Developments in Reinforced Plastics lloneyo to Materials', Preprint of 12lh Annual Conference of S.P.I. (Pcb. 105?) .1. R Bond anti I*. ( '. I lliott. `Strength Time Relationship of Silicone Lamin ates made from Various Materials', Preprint of 12th Anmtal Conference of S P I H eh. 1057) .1. B. ( icnshau. 'I'ormulating Polyester Premix Molding Compound' (Inter chemical Coipn.), Preprint of 12th Annual Conference of S.P.I. (Pcb. 1057) W. (). I t ickson ami W. R. Abt berg. `A Study of Various Rcinforcing'Matcrials in Pobester Premix Compounds' (Plaskin Div.), Preprint of 12th Annual Confetencc ol S.P.I. tl eb. 1957) * I be Use of Asbestos Pelt in Glass Reinforced Plastic l.nminatcs*. Bu. Ships Rcpoit No. 4860 <J 27 (Report No. 3) (Pcb. 14, 1957) 214 INOlUiANIC I Ml R 1 S most promising and most effective in electrical applications. A typicnl example of such applications is the electrical tape, the warp of which is made of continuous glass filament or of glass staple fibre yarn and the weft of softly twisted asbestos yarn or roving. In this ease, the exceptional strength of glass filaments contributes to tensile properties, while asbestos acts as a cushioning medium improving the Hex-abrasion properties of such a composite fabric. Perhaps the most successful commercial example of glass asbestos combinations is 1 Novabestos' tape (trade name of Raybestos-Manhattan Inc.). This tape is composed of 30 to 35 per cent of asbestos spinning fibre of non-critical grade, 60 to 65 per cent of glass fibre, and 3 to 5 per cent of organic binder. When coaled with polyvinyl acetate, it provides a tough, flexible, and water- and flame-resistant insulation. Amongst the oiganic fibres, cotton is still the most important reinforcing medium for various types of asbestos rovings. Several polyester-asbestos and nylon asbestos combinations have been developed in recent years in which these new man-made fibres arc mainly utilized for the purpose of improving the strength of the final product. They arc successfully used as a reinforcing core in braiding yarns, rovings, and tapes. ASnisios IN till I I I ( IRICAI INIM'SIRY 215 REFERENCES 1 Mulish Patent MH).| O') Impregnating Compositions for Electric Insulation, Hi itish I homson Houston Co., I.til 2 lltiiish Patent 60S.706. Compound Sheet Materials. Wcstinghousc Electric International Co 3 IP iloli Patent f*07.4X6 Impregnating Compositions for Electric Insulation, Koias 1 ij.. C. I> Moore and R. P. Mall 4 Mtitisli Patent 609.367. Coated Cahrics. Mritish Insulated Callender's Cables I id. and II F. Kictschmcr 5. Miitish Patent M2,202. Compound rubrics, J. E. Gordon, C. G. Fvans, t . N. Phillips. W. F. Mroadsmith. P. t.. McMullen, B. S. C. Quint. O. O. Burgess, ami II. M. Whitcut 6 British Patent 624.361. Compound Sheet Materials, Wcstinghousc Electric International Co. 7. Mritish Patent 630,319. Compound Fabrics. Impregnating for Electrical Insulation. Westinghoose Electric International Co. X. Mritish Patent M2.744. Felted Fibrous Products, India Rubber Gutta Pouha and 'telegraph Works Co., l td., W. W. PufTett, Hawley Products I td. and A. lew in `V Mi itisb Patent 643.OIX. Coated Fabrics, Compound Fabrics, Corning Glass Works 10. Miitish Patent 652.KOI. Plastic Compositions, B. B. Chemical Co., l td.. I . I:. Pnddefoot and F. C. Allen 11. Miitish Patent 654.024. Improvement in or relating to f/te Manufacture of l.l i trie Cables. Pyrotenax I.Id. 12. Miitish Patent 669.158. Coated Fabrics, lilcctrical Insulating Compositions and Processes. Miitish Thomson Houston Co., Ltd. 13. Miitish Patent 6X2.044. Compound Sheet Materials, British Thomson I loustnn Co . I td. 14. Mritish Patent 72*1,682. Electric Insulating Materials. General Electric Co. 15. Miitish Patent 6X3.VOX. Papier-mache Articles. Philips Electrical Industries I td. 16. Mritish Patent 712.634. Resinous Compositions, B. B. Chemical Co., Ltd. 17. British Patent 728,710. Porous, Fihrous Sheet Material for Electric Accumulators. Dry Accumulator Co.. Ltd. IX. ll.S. Patent 2,581.862. lilcctrical Insulation Material. J. S. Johnson and F. I . Schnlman to the United States of America (as represented by the Atomic Energy C ommission) IV ll.S. Patent 2,460.734. Impregnation of Asbestos with Tin Oxide, T. I). Callinan to General Electric Co. 20. British Patent 753.610. Improvement in Laminated Asbestos Materials, General Electric Co FOR FURTHER READING Adtesfos TeUi/es and the Electrical Industry (Booklet, Turner Bros. Asbestos Co . I id.I * Rockbestos Wire and Cable. Catalogue No. 10-G 1954, Rockbcstos Products (*oi pn. F. Jones. 'Insulation of Rotating Electrical Machinery*, Eng. Elect. J. (Dec. 1**53) 244 INORGANIC I IIUU S value of twice the tension at which the yarn is required to run. 1 he pate tensioner is then adjusted so that the balance beam floats freely between its two stops. The winding speed may be varied, but the rate of 60 yd/min is recommended for routine tests. 1 he yarn may be passed over the pressure roller and run directly into a waste can. A full description of this lest and several lest data have been re cently published in the U.S.A. n. REFFRFNCFS 1. `Moving a Lake to Get at n Mine*, ffww'wrw MVrC 1957. June Nth 2. `New Asbestos Mine amt Mill*. Asbestos. 1957, 39. No 2, p. 2 3. `New Asbestos Fibre Plant'. Asbestos. 1957. 39. No. 3. p 12 4. British Patent 780.619. Apparatus for Refining Ash-shn fibre*. I. J. Novak to Rnybestos-Manhattan Inc. 5. Private C ommunications with Platt Bros Ltd., Oldham, UK. 6. Private Communications with ClilTe A Co. l td.. Huddersfield. ILK. 7. A. R. Reed and J. Clark. `An Instrument for Rapid fractionation of Pulp*, T.A.P.PJ., 33, No. 6 f 1950) R. J. F. Kenny. `The Array Test*. Asbestos, 34. No. 12. 2 (1953) 9. C. Z. Carroll-Porcvynski. `Asbestos From Rock to Woven Fabric', The Textile Institute. Manchester 10. M. S. BadoMet. *Filtcrability of Asbestos Fibres Used in Wet Processes'. Can. Min. MetaU. Ruff. Tram.. 52. 260 (1949) 11. U.S. Patent 2,568,023. Free-filtering Asbestos atnf Method of Pro,fu< (ton 12. C. 7. Carroll-Porc/ynski. `Asbestos Textiles l.cvclncss testing*. Asbestos, 36, 11.2 (1955) 13. C. Z. Carroll-Porcvynski. * Modem Testing Methods'. .KAriM*. 33. No. 12, 2 (1955) RECENT PATENT ? ITFRATURF ON ASBFSTOS Friction materials British Patent 742,286. Brake Linings. British Resin Products t id. Anacardic materials, such as cashcw-nut-shcll liquid, arc polymerized by mixing with one or more phenolic sulphonic acids and heating. 1 he products may be further polymerized or they may he reacted with formaldch\de, giving products used in clutch facings and brake linings. British Patent 757,039. Friction Linings, Fcrodo Ltd. The frictional properties of friction linings comprising a fibrous material, such as asbestos, and a binding agent, particularly a mixture of natural rubber and a phenol formaldehyde resin, arc improved by incorporating a small amount of molybdenum disulphide. British Patent 769,212. Refractory Brake Linings Compositions. Bendix Aviation Corpn. * A friction material for brake linings is formed by a sintered mixture of mullitc and a metallic binder. The mixture includes molybdenum or tungsten, which acts to inhibit the formation on the friction surface of a high-melting-point glaze. An apparatus for testing specimens of the friction matciials when raised to an appropriate temperature is described. British Patent 77,768. Phenolic Resin Meta! ('ompt>sition for Broke Shoes, Westinghouse Air Brake Co. UK I M Ol vlini'MINIS IN 1111 AS Ill'S I US INDUSIRY 245 \ composition Miiiablc lot making brake shoes for railway vehicles consists Phenol fotinaldclndc resin . Cast non chip-. . . . Asbestos libtc . . . t imnlcanized powdeted rubber Cat bon black ... .... ... . .. . .... .... (Pet rent) X to 15 60 to 75 12 to 20 4 to 10 0 to 10 Bt itbh Patent 7X4.9X7. Rotnling of Meta! to Moulded Compositions. Bnkclilc Ltd. Ibis (mention is for improvements in the bonding of metal components to moulded compositions comprising a filler (c.g. asbestos) and a bonding agent. British Patent 787,7X2. Apparatus for Extruding Brake Linings, James Hardic and Co. I td. Hiitish Patent 789. >X7. Friction Elements, The Raybestos Co. Ceramic Diction element for aircraft or railroad cars comprises a fired ceramic matrix bodv composed of at least 60 per cent by weight of alumina or zirconia oi their mixiuies and having a porosity of at least 10 per cent by volume of the tiled body. Hiitish Patent 7X1.5S6. Frictional Elements, Small and Parkes Ltd. PnlsphosphiKhioroniliidcx rubbery materials, being whole, inorganic and thermostable and capable of undergoing polymerization at temperatures of 360 (have been found to be useful as a bonding agent in the manufacture of In. " mjI elements. In one example a mix for producing a friction clemciM .. he following ingredients: (Parts} Asbestos . . . . . . . . .135 Oily polyphosphochloronilridc ..... 40 Red oxide of iron ....... 32 Saltci. I Iwin J. . Selecting Friction Material', Part I. Selection factors. Woven, rubberized, and moulded materials. Materials in Design F.ng. 46. 5, 130 133 (Oct. 1957) Btakes. drums, clutches etc. British Patent 7X8.703 .t Brakes. A vehicle etc., brake mechanism with a secondary actuating cylinder is operated alternatively by high- or low-pressure fluid. Fawick, T. L. 30.1.56. (U.S.A.). British Patent 7XX.750 Clutches. A magnetic clutch is automatically co-opcrablc with a brake controlling gear selection in a planetary gearing, c.g. for a vehicle. F.aton Mlg. Co. 16.6.54. (U.S.A.). British Patent 7XX.830 . Brakes. A split carrier sleeve is friclionally pressed against an automatic adjustment pin. c.g. in an aircraft disk brake, by split rings. Goodyear Tire and Rubber Co I.X.55. (U.S.A.). British Patent 78X.X4I . Disk hake. A caliper shoe subject to frictional drag in brakes of automobiles, etc. is tightened on the disk by the wedge action of inclined bearing surfaces. Coutalcn. F. 10.2 56. (France). British Patent 7XX.856 One-way clutch. A fticlion element comprises a variable-compression coil spring. Parkinson and Cowan Ltd. 30.6.54. British Patent 7X9.2R5 _ Clutch. For example, an aircraft propeller turbine, hydraulically controlled with vaiiahlc application pressure and high-rate disengagement. A modifica tion oi'Hi itish Patent 690,592. Gen. Motors Corpn. 27.6.56. British Patent 789.2X7 ... . dutch disk. Clutch disk which docs not chatter, squeak, etc. is divided into I 246 IN'iRf.ANM t JUKI S vanes each carrying linings w Kh grooves extending inio ibc \ .inc main ul. S A Ltancniscdu l'erodo. 6 7 s* <} ranee) Biilish Patent 7X<>,477 Brake or (.'hitch. f-awick Cmpn. A hook-flange assembly In which a base plate ol a friction Nock is seemed to a nihhei-mm faced annular, fluid disten sible member. British Patent 675.3X0. Asbe\ft>\-eem,'nf Bt*m ,1-mal.ing \ta, hinc\, I . Y. Hringuc Asbcstos-ccmcnt slurry in a tank is mixed and shictidcd hv totaiv blades, and is deposited through a metei ing outlet onto a belt tiaxellini* oxer a suction box and conveyed to a wet press and to a making-roller. British Patent 677,4X8. Improvement in or ic/ofing to the imnnunt of f ihn cement Products. (.). H. Waecliter Asbestos-cement is wound up on a making-roller. The sheet snipped thete- from is passed on a conveyor to a rotary cutter, conveyed to a traxelltng bell which passes through a drying chamber heated by gas. elect*icily, or ladiant heat to 400" to 600 K to dry the outer strata of the sheets and then through a cooling chamber to a platen or roll press with plain, intaglio, or relicT rolls, e g. to emboss a wood-grain pattern on the sheets. Hritish Patent 702,301. Moub/ing Aslrstos-ecment. Soc. due. I ibiocimcnl et tics rcvctements l;lo. Hollow bodies of angular or curved shape, c.g. T*pieces and pipe bends, arc moulded from a mixture containing a watery substance in which asbestos and cement predominate, by feeding the mixture alter being homogenized under pressure into a moulding space between a mould and a coic and having the required non-rcctilincar or angular character, the walls of the mould and or core being perforated anil coated or covered with filtering material British Patent 70*1,701. Moulding ('onugated .Sheets (torn l thtoto Cenwnt, .1. P. Pctrilsch A plant for manufacturing hoards from asbestos cement compiises a con veyor system associated with means for conngaling solt sheets on moulds anti means for stacking the moulds loaded with the corrugated sheets. British Patent 704,0X9. Process of an Apparatus for A foult/ing At tides ftom Pasty Masses (c.g. asbestos cement). N. V. f let nil v II. i erste Nedet- landschc Kabrick van Asbest cement Platen Mnrtinit I he invention enables the production of machine-made bent pipes, sockets, bends, T-shaped articles and the like. British Patent 770,912. Asbestos cement Prothtefs covet at w ith .Mammons Cement Compositions. Amianths AKT-(ics. A, layer of asbestos Portland cement, from which gypsum has been removed with the mixing water during manufacture, is covered with a wet or dry laser of coloured asbestos aluminous cement to which may be added magnesium silico-fluoridc and sugar to retard setting. The aluminous cement may be supplied in front of the forming roller. ' British Patent 772,666. Coating Asbestos Shingles. Rohm and Maas Co. Polymers and copolymers of vinyloxy ethers and the mcthylol and alkoxv- mcthyl derivatives arc applied to asbestos shingles to imparl a protective coating. British Patent 775,303. Cementitious Compositions, F indlay (J. K. A pointing material consists of a dry mixture which is subsequently mixed with a watcr-ahsoihcnt filler such as aslxcstos fibre, shellac, and a plastic moulding powder. British Patent 775,492. Plastic (ompositions. Insulex Mineral Products l.td. Thermal insulating lining for pipe- is prepared by intimately mixing and grind ing together lime and natural sil a, c.g. kicsclguhr, and adding vcrmiculitc or asbestos and heating the composite material in an autoclave to promote reaction between the lime and silica. British Patent 775,919. Machine for Moulding Concrete Pirns. Akticbolaget Otto Verken British Patent 761,744. Fibre Board. Kailhoms Akticbolag Solid moulded slabs or other shaped bodies of asbestos are prepared by KIMM Ml \ 1 | Ol'MI MIS IN I III ASHISIOS INDUSI KY 247 pie*.ipif.iting the binding agent on It* the fibres suspended in an aqueous solution ot the binder, e g caiboxymcthyl cellulose, by acidifying the solution with acid, p.ntially dehvdiating the coated fibres, pressing them to form moulded dial's ami diving the slabs. lb itish Patent 7X6.5*5. Stmt fatal Panel Incorporating Corrugated Asbestos Sheet os lit info,cement. Pctrcdcnc l.til., 23 39 Hendon Valley, London. S W.1K A stmctmal panel lor use in building comprises a core of corrugated asbestos sheet et'v ci cd on at least one side with a layer of hardened gypsum plaster moulded on to the cote so as to bridge the crests of the corrugation. Hijiish Patent 790.040. Improvement in Moulding Fibrous Cement Pipes. (.oalita S.A., .huge Juan I, Valencia, Spain. Internal mould lor manufacturing bent, tubular fibre-cement elements, where in the core, in the form of a solid cylindrical body occupying the interior of a pneumatic rubber lube, is articulated and flexible. U.S. Patent 2.*2X.35J. Apparatus for Producing Pipes. John Fcrla to U.S. Asbestos Cement Pipe Co. # I he object of this invention is to improve the construction and manner of opeiation of the machine, particularly in the raising and lowering of the calcmtei ing tolls, ami the means used for applying pressure to the formed pipe. A Im (her object of this invention is to improve the manner of extracting the excess moisture from the applied layer and to improve the mechanism for supphing mixtures of asbestos and cement to the mandrel. U.S. Patent 2,529,175. Apfwratm far Texturing Asbestos-cement Pipes, W. L. Nelson to United States Civpsum Co. | his invention applies to a machine for impressing a design into the surface of a plastic sheet. It comprises a conveyor belt, a die suspended above the bell, a sming-hased pressure-imparting roller and means to reciprocate this toilet. . U.S. Patent 2,568,023. tire-filtering Asbestos and Method of Procuring Same. \V. M. Perry to Johns Manvillc Corpn. I his invention relates to an improved free-filtering form of chrysolilc asbestos fibres and to a method of treating such fibres to increase their frccncss and lillcrability. U S. Patent 2.588.828. Composition for and Method of Producing Coated Cement Stir faces mat the Product Resulting Therefrom, S. Ciricncr to Johns- Manvillc Corpn. * Putable, weatherproof, and decorative coatings for asbestos ccmcnt-basc sheets arc obtained from a suspension of finely-divided mineral pigments and 3 to 6 per cent (dry weight) of silicone resin in an aqueous solution of an alkali silicate. . U.S. Patent 2.750,302. Method of Preparing a Non-blooming Cement Shingle and Products. I\ Camarda U S. Patent 2.7X5,987. C. L. Blake , Roofing anti siding compositions comprise a mixture of about 35 to 50 per cent Pottland cement anti 15 to 20 percent asbestos fibre. U S. Patent 2.701,131. Johns-Manvillc Corpn. . A method is described for manufacturing high-temperature insulating blocks ami shapes from a slurry containing 35 to 78 per cent diatomaccous earth. 5 to I s pci cent asbestos fibre, 2 to 7 per cent hydrated lime, 0 to 10 per cent bento- Mile, anil 5 to 10 per cent self-setting normal magnesium carbonate. U.S. Patent 2.794.752. Light-weight Concrete. Intcrnationclla Siporcx A.B. (Sweden) A cellular concrete Mock made by expanding with aluminium powder a slurry of cement, lime, ami asbestos fibres, is impregnated with silicate anu thermo plastic icsin to increase its tensile strength. U.S. Patent 2,796.813. Streatite Research Corpn. Impiovcd backing rings for the welding of ends of pipe sections arc made of porous, shaiterablc, easily machined ceramic compositions. Mixtures include kaolin, talc, feldspar, kyanitc, and asbestos. 248 l N t r It (; \ N i ( i i li K l s U.S. Patent 2.79X.822. Thermn-Konf Inc An improved surfacing niatcrial lor roots is made l>y apphrng to a heat softened asphaltic base a layer of Portland cement, plasticized polw invl acetate, short asbestos fibres, marble floor, powdcicd atnmininm silicate, anil water. U.S. Patent 2,813.637. Shingle Take Off, Johns Manville ('orpn Improved method and apparatus for automatically handling and slacking uncurcd shingles and sheets of asbestos ccntcnf. Recent literature afinterest `Colour on Concrete and Asbestos.- Bldg. Mat. IV57. 18. No II. p 47.1 The use of internal enamel lor the waterproofing and protection of concrete is mentioned. `Apsb. e1s6tos-cement Decking Tiles lor Hal Roofs.' little. Mat. I'is? |g No. I . Asbcslos-ccntcnt decking tiles with incombustible finish base been developed for application over asphalt and built-up fell coverings. 'Asbestos-cement Panels for Interior Walls of Slone.' //..roe an,I lit,me 8 174. (Sept. 1955) '' `Asbestos-cement Products. What They Arc and How to Use I'hcm ' Am Rltl. 72. 8.1 90 (Oct. H50) The Plastic and Structural Properties of Asbestos C ement.' Chao. Pe Jean. Univ. Microfilms. Publication No. 4127. 158 ' 'Improvement in the Quality of Asbestos cement Materials bv Hydrophilic Additives.' S. B. Salid/hanow. Dokladr Akad. /slunk. Uzbek . 6 17 IS (1955) Additives arc surface-active materials, including soap flakes. Asbestos in the fl,tor.tiling industrv British Patent 785,059. Laminates let /lociine Corerine. Soc. Del. I.indcuni Soc. A laminated material suitable Tor door covet ing comprises at least two laminae of a highly-plasticized resilient polyvinyl resin and at least one oilier non- dcformable lamina containing little or no filler or plasticizer which is sand wiched between two resilient laminae. British Patent 785,020. Floor Cttret ine. Rubber Improvements I .til. A Boor covering of plastic or rubber is coated on its undersurface with a tacky cement which is protected by a removable sheet of vinyl chloride polymer. ' British Patents 784.488 and 688,373. Laminated Materials for Carmine M alls and Floors, Marlcy Floor Tile Co. A laminated-sheet material suitable for coveting walls and doors is fbimed by saturating a fibrous-base layer, c.g. fell or woven fabric, with coal-tar or it solid or highly-viscous distillation residue of coal-tar, covering one surface of the base layer with an intermediate adhesive layer and laying thereon a wearresisting layer of a thermoplastic composition consisting of copolymer of vinyl chloride and vinylidcnc chloride together with a plasticizer, and at least 59 percent of a filler containing asbestos, cork, harvlcs. china clas, dolomite etc. ' ' ' British Patent 777,748. Moulding Linoleum Trpe Sheet Material. Armstrong Cork Co. British Patent 777,067. Bituminous Compositions for L'loor Covering, Serltlcs Ltd. ' A join-filling or door-covering composition comprises a mixture of tar and 6 lo 18 per cent of vinyl chloride resin. Asbestos as a filler niav be present in (his composition. British Patent 770.067. Bituminous Compositiim. Scnitex Ltd. The composition which may be used as a join-filling material, as an electr ical insulating material, as an adhesive or fixative, or in the construction of roads, airfield runways, doors, or bridges, comprises an oil-gas tar admixed with a III ( I \ I !>l VI I lll'MI N IS IN llll; ASIII SIDS INDUSTRY 249 poixniei poll vnnl clrlotide in an amount of from 5 lo 60 per cent and may contain lillcis. c :. granulated cork, rubber crump, asbestos fibre, hydrated lime, limestone, or brick-dust, and a plasticizer such as dibutyl phthalatc. Mulish Patent 756.183. Making Marbled Sheet Maleiial Rubber and Fibrous Composition. Semtex I til. ,. T samples describe a thermoplastic composition comprising polyvinyl chloride, tricrcsil phosphate, asbestos fibre, dried carbonate, dried stearate, gelled castor oil. pigment, and whiting. Vulcanizablc rubber composition com prises natural lubber, high styrene butadiene rubber, asbestos fibre, whiting, zinc oxide, wax. anil sulphur. ' British Pateirt 756.384. Marbled Thermoplastic Sheet Material. Semtex Ltd. A process for tiic ptpduction of thermoplastic sheet or rubber-composition sheet matciials having a marbled pattern, is described in which a net of the mater ial. e g. plasticized polyvinyl chloride, is superimposed on a base sheet of the same material but of a different colour and the two bonded together hv calendering at an elevated temperature. Ill ilish Patent 756.944. Jointless Flooring Compositions, R.M.Buthhy C omposite Mooring materials based on polyvinyl resin latexes arc described which give a veined or marbled effect on trowelling. British Patent 751.733 Laminated Sheeting Flmtr Coverings.Semtex Ltd. I animated sheeting suitable for use as door coverings consists of a vulcanized rubber backing sheet to which is bonded a wearing surface of a filled plasticized polv vim I resin such as a plasticized polyvinyl chloride resin containing asbestos filler, the sheets tire bonded together by applying a rubber-metal rcsinate adhesive to the rubber layer, and an adhesive comprising a mixture of an acrylo nitrile copolymer and/or a vinyl resin copolymer and a phenol formaldehyde resin to the polyvinyl resin layer and finally heating the two under pressure. British Patent 745,955. tile Compositions. Armstrong Cork Co. files which can be made in light-duty equipment comprise 70 to 80 per cent asbestos filler and 20 lo 30 per cent of binder. The binder includes a phenol formaldehyde resin, a vinyl resin, e g. a vinyl chloride-acetate copolymer and a plasticizer. British Patent 742.231. Roller Sheeting Plastic Fibrous Compositions, R. Klinger and 11. I oltr . examples arc gixen of compositions to be rolled into sheets, suitable for door surfaces, insulation, and packing. The composition for door surfaces and packing contains rubber, benzine, zinc oxide, sulphur, and asbestos fibres. Also, for the door lilhoponc is added and for the packing, heavy spar. British Patent 745.149. Thermoplastic Compositions for Tiles. Semtex Ltd. Thermoplastic compositions suitable for the production of tiles of satisfactory indentation, static load, and grease resistance comprise 76 to 50 per cent by weight of filler, e g. asbestos, and 24 to 50 per cent by weight of binder com prising a polyvinyl tesin. e g. vinyl chloride, vinylidcnc chloride copolymer, a plasticizer, and a blown vegetable oil. British Patent 741.01)1. Plastic Tiles. Armstrong Cork Co. A composition suitable for making plastic tiles comprises 60 to 80 per cent by weight of filler such as asbestos and limestone and 40 to 20 per cent by weight of binder including a vinyl chloride-acetate or vinyl chloridc-vinylidenc chloride copolymer, a coumarone indene resin or a polystyrene resin or poly mers of unsaturated hydrocarbons, a dihydric alcohol-aromatic dicarboxylic aciil condensation product, c.g. dicthylcnc glycol phthalatc. and plasticizer, e g. tiicrcsvl phosohatc. . British Patent 740.861. Fibrous Compositions for Floor Tiles, l.tablisscmcnt Slallit. . I ihro-ccmcnl compositions for door tiles comprise sawdust treated with calcium chloride and nitrile, volcanic stone, quartz, sand and gravel, and Port land cement. British Patent 738,794. Resilient Tiles. Armstrong Cork Co. A resilient tile comprises 70 to 80 per cent filler and 30 to 20 per cent binder. I he filler contains a linclv divided inorganic material, c.g. limestone, and a 250 NOR(iANIC I I M R I S fibrous material. c p. asbestos. The binder contains a tesiiwnodificd phenol formaldehyde resin and plastici/cr. I he composition is hot-mlUd into a blanket, then passed through a calender to produce a sheet which is cut into tiles. Recent lifeiafure of interest Tire Retardant Vinyl Asbestos I Me 1 looting ' Manufacturers: Kentile Inc., 5X ? d Avenue. Biooklvn. N.V Press announcement: The I numeint limes, .lannaiy xih. loss 4 Reinforcement of Plastics with Asbestos.' Anon. Kant u (iumnti |`S7 10. No. 11,277 280, 2X2. 2X4 This article reviews on the basis of seventeen telercnces. mouMini; composi tions of asbestos and synthetic lubbers. poKletrallumoetlnlonc and \m\l compounds in brake and clutch materials, seals, aeid-icsisiatu coatings, flooring, and coalings. 4 floorings.* F. l ortun. Knnsstolle, 47, 56(> S7X (1957) General requirements of good flooring materials arc enumeiated after which plastic floorings arc discussed including that made of polyvinyl asbestosfilled resin and linoleum. Progress made in standardization is reviewed. Asbestos paper British Patent 759,319. As/testos Paper, Raybcslos Manhattan Inc. Paper is made from a suspension of chrysolite asbestos fibres having 25 to 100 percent of the weight of the fibres of a w ater-soluble soap, e g ammonium, sodium or potassium hydroxide reacted with linseed, castor, soya, or fish oil. as colloidizing agent. British Patent 771,0X0. Coated Tah ir, Kcltog Co, Materials such as paper, leather, glass, wood. iron, copper, aluminium, or asbestos may be coated with a resinous polymer of irilluoiochlotoctlnlcnc applied from a dispersion. * British Patent 773,563. Impregnate// Electric Insidafion. BIX A cable conductor is enclosed in a laminated body built up horn insulating strips and permeated with a gel formed bv subjecting a liquid organo poly* siloxanc to high energy irradiation. The strips may be of asbestos paper. British Patents 777,913 and 753,610. Electric Insulating /Vi/wt. General Electric Co. Electric insulating paper, laminated plates, etc. made from asbestos and containing minor quantities of bentonite, or glass or ccUulosic fibres, arc impregnated with phosphoric acid compound and healed to 600' to 1,000 C , c.g. for I to 15 hr to form products of a low power factor and dielectric con stant and of high dielectric strength. The asbestos may have an iron content of 6 per cent, or may be purified to an iron content of less than \ per cent. Highly viscous aluminium phosphate solutions may be used lot bonding the laminates. Alternatively, orthophosphoric acid and asbestos fibres may be moulded and fired. British Patent 7X1,512. Paper Containing Synthetic filaments. On Pont dc Nemours and Co. Paper is made by felting, e g. on a paper-making machine an aqueous* pulp having suspended filaments of polytctrafluorocthylcnc. asbestos fibres, or flake mica, a setting agent, and antifoaming agent. The polytctrafluoroctlivlcnc filaments may be prepared by shredding extruded rod. The paper made mnv be sintered at 350' to 370" C to improve its strength. U.S. Patent 2,401.313. Reinforced Asbestos Paper, \:. G. Quinn U.S. Patent 2,451,805. Coating Asbestos Paper, T. f). C'allinan General Electric Co. The tensile and dielectric strengths of asbestos paper arc improved by treating it with a 20 per cent silver solution of magnesium chloride and drying, dipping in 20 per cent solution ofconcent rated ammonium hydroxide and drvinc at 175* C. ' U.S. Patent 2,467,540. Treating As/testos Paper with Hvdrofhunie Acid, F. M. Marion KIIIM hi VI I Ol'M! NTS IN Till: ASBESTOS INDUSTRY 251 I lealmcnt improves the tensile strength. U.S. Patent 2.493.601, Insnlatinv Paper of Asbestos and Renfonife, Y. R. W'altci s to (ienci al I Icctric (o. U SPatent 2. <57.71 V lest Snips. A. Wright l lealmcnt <4 asbestos paper for sugar testing. US. Patent 2.66I.2XX. loiminv Asbestos Products from Polsviilcnt Jon Dis- fu t si ,1 Ubi \h<\. (i I). B.ubaias U S Patent 2.626.2IV lv/xwAv Dispersion. I. Novak to Raybcslos Man hattan Inc. Asbestos-tibie dispc'sions for the manufacture of paper. U.S Patent 2.791.1 <9 Cement-bound Asbestos Paper, S. M. Lillis A low-cost process for making cement-bonded asbestos paper is described in which the heater slum comprises 96 to 9X per cent water and 2 to 4 per cent solids, the latter consisting of XO to X8 per cent asbestos fibres and 12 to 20 pet cent Pod land cement. A solution of sodium silicate is applied to the pat liallv dt ied paper. / aminated motet infs British Patent 753,610. /.aminated Asbestos Material, General Electric Co. I aminated asbestos products comprise asbestos laminates bonded with an aluminium phosphate ami having a varnish coating of an organopolysiloxnne resin Biitish Patent 761,132. /.aminated Pudding Board, Tcntcsl Fibre Board Co. A sound-absorbing building board for lining ceilings and walls comprises a facing lavet of hard material such as hnrdboard or plastic material formed with perfniatinns. united for example, by gluing, to a backing of softer material such as asbestos. British Patent 764,335. I.aminated Material, I.C.I. Ltd. Articles of clothing that reflect heat radiation arc made up from flexible sheet material, e g. asbestos impregnated with a flame-proofing composition, or coated with polyvinyl chloride and metallized with aluminium. British Patent 765,562. Laminated Materials, Distillers Co. Ltd. I animates arc produced from materials such as asbestos, using as the bonding agent n mixture of an unsnturated polyester resin, a monovinyl aromatic compound and a finely divided vinyl chloride polymer. The laminates arc useful in the production of boats, tubes, ducts,car bodies, and aeroplane parts. British Patent 771,559. Thermosetting Synthetic Resin Laminates, Scmtcx Ltd. An antistatic material in the form of a tray or container comprises a polyester tesin having a laminated fibrous reinforcement, e g. asbestos embedded within it and having a small proportion of acetylene black distributed through it. Mouldings British Patent 742,011. Moulding Resin-impregnated Fibrous Material, Westing- house flcctric Intern. Co. < A leltigcrator is made by uniting a mass of fibres, c.g. asbestos with a small quantity of binder, shaping the mass into a desired body impregnating the entire exterior of the hotly with organic resin, curing and hardening the applied resin. A final coat of enamel may be applied. British Patent 756.745. Moulding Fibre Resin Material, Bristol Aeroplane Co. Ltd A turbine blade is produced from icsin-bondcd asbestos. British Patent 762.462. Moulding Resin-impregnated Fibrous Material, National Research Development Corpn. In making a built-up aerofoil skin by vacuum moulding, use is made of several layers ol asbestos felt, which bad been impregnated with an aqueous solution of phenol formaldehyde resin and, just before laying in the mould, further impregnated with an acetone solution of a stable resorcinol-formaldehyde icsin. 252 inorganic i iitki s British Patent 766,918. Afotthfing Fibtotis Works or fioonfs, .fohns Mnnvillc Corpn. A pre-rcnctcd dilute aqueous slurry, eg. of asbestos. diatomaceous caitli, and hydrated lime or bentonite is supplied to a high-pressure piston mould having a brass perforated piston and perforated base plate, to lotm blocks or hoards. British Patent 788,063. Moulding Reinforced Plastic Tithes, I he Distillers ( o. Ltd. The fibrous reinforcing material may be asbestos. British Patents 778.683, 778,6X5. 77S.6X4. and 778.661. Moulding Resin f ibre Articles, Bristol Aircraft Ltd. Aircraft wing panels arc made of woven or Idled asbestos fahiic impregnated with thermosetting resin. U.S. Patent 2,795,510. Moulding Composition, .1 S. Thompson Free-flowing moulding composition comprises asbestos libics spraxed with acid and aluminium metal. Bituminons compostfions British Patent 742,639. Bituminous am! Fibrous Ctwtposifunts, f Tz. Posschl. An expansion joint composition comprises phenol, pitch, and fillets. The fillers comprise a mixture of asbestos, baryta, and china clay. British Patent 742,711. Fibrous Compositions, Ccllon Ltd. Mastics for use in lagging pipes consist of the following (in per sent); petroleum residues (35). tung oil (35). wood . our (10). short fibic aslvstos 116). titanium dioxide (3), and cobalt driers < t). British Patent 756,723. Bituminous Composition, Chetnieprodukte Cics. Anti-corrosion and scaling compositions arc described with asbestos librc as a filler. British Patent 776,057. Bituminoits Composi/iiuts, Winn and Coalcs I til. A material which is used as an insulant to ptcvcnl galvanic coi rosion of metal junctions comprises a carrier of woven or felted fabric made from asbestos. Filtration British Patent 770,396. Paper Coated w ith Adhesive and nines, Vokes Ltd. A filter for fluids is produced by deeply pleating a laminated sheet comprising a sheet of paper impregnated with a synthetic resin hut leaving the pores open for the passage of filtrate adhered by means of a pervious adhcsi\c which docs not form a fluid-tight skin to a layer of felted material, c.g. asbestos. British Patent 780,265. Filter Mats, Ford Ltd. Mats formed of ccllulosic and asbestos fibres for use in filter presses for beer, have directly deposited on one or both surfaces a water-insoluble resin, e.g. urea-formaldehyde applied as droplets, which, after evaporation form par ticles to provide a permeable film on such mat surfaces. U.S. Patent 2,614.655. Filter AlaterUd, S. II. Katz, to U.S.A. as represented by the Secretary of War. A new type of filtering medium is made by impregnating a filter paper with a finely pulverized asbestos-particle filtrate. U.S. Patent 2,790,523. Cigarette-smoke Filters, Cambridge Filler Corpn. A composite filter sheet material comprises asbestos, viscose, and cotton libics. ` U.S. Patent 2,795,103. Sereen Filtering, G. Jenison Asbestos fibres mixed with foamed gypsum plaster forms a porous mass. U.S. Patent 2,797,163. Filtering Material, W. J. Smith and R. W. .lames to U.S. Atomic Energy Commission The sheet is formed by a wet process of glass fibre, blue asbestos, and polvacrylic resin. The resulting sheet has good heal resistance and filtration properties. `Disposal of radioactive wastes at Argnnnc National laboratory.* \V D. Rodger. Proc. fnd. Haste Conf 8lh Conf. 1953, 474 479(1954) Gaseous or gas-borne wastes arc disposed of by conventional air-cleaning equipment supplemented by use of the A.F.C. filter, a highly ictcntixc paperasbestos filter, later burned in an incinerator. Kit I \ I 1)1 V it or Ml N I S IN I nr ASBESTOS INDUSTRY 253 I /< it irid institution Mi nidi Patent 773.2X2. Ffeetiieal Insulating Material, General F.lcctric Co. An elect\ ical insulating structure composes a sheet of insulating base material impiegnated with an organic binder resin and coated with an organo-polysiloxane icsin. Base mateiials may he multi layered felted-asbestos sheets. Biiiish Patent 777.2`HL l aminates for Electric Insulation, Wcstinghousc Electric International ( o. Compositions which arc useful for picparing laminates and for impregnating elcuiical coils comprise a polysiloxane, polymerizable through the vinyl gtonp in the presence of a catalyst. I lie laminates may consist of sheets of asbestos chlh. U.S. Patent 2.7XS.052. Electrical Insulation, E. L. Schulman to Wcstinghousc I Icctiic Corpn. A i hin laminated sheet of electric insulating material, having high strength and good icsisinncc to cracking, comprises a sheet of glass cloth bounded on each side by a surface sheet of asbestos paper impregnated with a polyester resin. I t.S. Patent 2.792.871. Insulating Structure, P. Doigan to General Electric Co. Asbestos material impregnated with a polyester resin is wound in the form of c> lindeis foi use as dielectric harriers on transformer cores. U S Patent 2.809.946. Moulding Composition, T. R. Blcgen and T. G. Custer to (icncral Floe* tie Co. Moulding composition for manufacture of products having improved water icsisinncc and electrical properties comprises unsaturated polyester resin, chiysotilc asbestos, and a lead salt. Textiles British Patents 75X.640. 746.037, and 746.03R. H`aterpmofmg Asbestos, LibheyOwens l-'oid Clan Co. Asbestos is waterproofed by the application of a vinylsilanol aqueous disper sion at a pi I of lietwccn 3 and 8. The material may be immersed in the disper sion or the dispersion applied to the material followed by drying. The silanol condenses to form an insoluble water-repellent silicone. British Patent 772.0XX. Silicone-coated Cloth, General Electric Co. Heat-resistant asbestos-cloth is coated with an organopolysiloxancs composi tion. British Patent 780.660. honing Presses, R. Ixssing [ kc is made of asbestos fabric as a heat-insulating material. `Aluminized Asbestos Keeps Driver Cool.* Anon. Materials in Design F.ng. 46. 7. 210. 212 (Dec. 1957) Keasbx and Mattisonk aluminized asbestos cloth used as a protective cover for a caialx lie exhaust purifier installed on a fork lift truck. / ibre recovery U.S. Patent 2.803.346. Removing Filters from an Ore, D. Weston and A. R. MaePherson The apparatus and method arc described for removing opened asbestos fibres from host rock ami unopened fibre bundles. U.S. Patent 2.813.306, Dust Renmving, Me. W. D. Sheldon I he mass of fibres is passed over a screen being subjected to the pulsating air How which alternatively lifts and redeposils the fibrous material. I t.S. Patent 2.X 13.626. Recovering Asbestos Filters, C. G. Boss Good fibres arc iccovcrcd from the tailings by allowing the latter to fall free tluough a series of electrostatic fields where asbestos is progressively separated from waste. `Machine for Reclaiming Asbestos Spinning Wastes.* (In German.) K. Muller, (iiimnti u . f sl*est., 10, 694. 696 (Dec. 1957) Separates usable fibres from foreign matter and fine asbestos dust. I N (> R (; a \ I ( I IIMU S Miscellaneous British Patent 752,433. Pafehinjc, Ametienn Matictla Co. A composition for patching plywood compiiscs a thermosetting rcsiti. e.g. phenol formaldehyde resin, mineiat fillers, e g. china cla\. and lihons material, e.g. asbestos. British Patent 783,327. Composition (or Jointing Constitutional Putts The hands, strips, or moulded elements to he used lor jointing comprise; Bitumen .... Rubber ... Polyvinylchloride or polvctlnlcnc Petroleum jelly . .. Pulverized rock . .. Asbestos . . Chlorophcnol . .. fPer tent) 50 (y 4 7 24 X I British Patent 766,918. Minna/ fibre Hoar/. Johns M.tnvil Ic ( oipn The process is described for the munuf'a elute of therm.i insulating hoards made from amphibolc or Amosite asbest 14 INORGANIC FIBRE PAPERS Asnr.stos vaptrs S lethal of manufacture Asbestos papers arc made in thicknesses ranging from 2-5 mils to 60 mils and in widths from 36 in. to 60 in. The equipment and the production technique closely follow those for ordinary cellulosepaper making. Chrysotilc asbestos of paper stock grade is mixed with a large amount of water to the consistency of a thin slurry in a beater of conventional design. The hinder, usually of a proccsscd-starch type, is added in the beater in order to improve strength and permit faster wet-end operation. The slurry discharged from the beater by means of plunger pumps passes over settling troughs where rock and foreign matter are removed. The purified material is afterwards screened immediately ahead of the paper machine in order to eliminate oversire fibres and unopened fibre bundles. At this stage, the material reaches the wet end of the machine and the formation of the paper begins with the pressing of suitably prepared layers of asbestos fibres by felt couch rollers. The sheet thus formed is transferred to the dry end of the machine, where it is passed through a series of steam-heated rollers and wound on a drum. Uses Asbestos papers arc chiefly used as a low-cost spacing material in the electrical industry and for heat insulation. Some years ago a range of high-purity asbestos paper was de veloped by the Johns-Nfanvillc Corporation, made entirely of asbestos fibres with no binder, the so-cailcd `Quinterra' grade, which opened new possibilities in high-temperature dielectrics. Its main chat ''u-istics arc low thickness, homogeneity, flexibility, and high nice1 and dielectric strengths *. Successful attempts were mark- to icinfnrcc high-purity asbestos paper with glass fibres, and this material would appear to have possible applications in electrical machines, as its tensile strength and resistance to tearing arc quite high. Another interesting combination of asbestos and glass has recently been introduced; glass cloth and asbestos paper, both of 255 2(>(> I NORC A N It I 111|< I S Cushioning materials between metals aiul brittle ceramics, anil rcrractories to prevent vibration failure of brittle materials at high temperatures. Low heat-capacity refractory facings on steel and other metals. Paper can be cemented to metals to alford protection from heat and corrosion. Gasket between orifice block and feeder bowl in glass furnace fore hearths. Seal between refractory sub-assemblies in launder or piping systems conveying molten non-ferrous metals. Protective sheet to prevent scratching of polished metal during heat treatment. For production of inorganic or organic bonded laminates ;l. Properties Chemical composition ' Per n or Alumina . . . . , . Silica . . . . . lloric oxide ...... Soda.......................................................... Of, Total magnesia, lime, iron oxide . . si 2 47 | on 0s Thermal conductivity (B.t.u./ft* hr deg. 1) Mean temperature C Ft j GOO 1,003 1.400 I.X00 2.000 `A" fartot 0 52 0 7.) 0-95 1 22 I .76 Physical data Series Rated thickness tin.l Density, Ih/fl" at rated thickness . . H'/lb (approx.) . Lb/ft' (approx.) . 970,4 970 /f //i "70/ 0 020 19 .71 00.72 oo:o , 0 040 1 1X5 , 16 n 1 19 0031 0057 070-/7/ v70-y 1 0 040 | o oso 14 :o 0 0<0 15 04 0 10ft 970-./// 0 oso 14 10 0 100 I \ i) It t; A NI (' I I It It l P A PI It S 207 IU I I KI Nt rS 1. '(Jointerta and (Juinorgo electrical Insulations'. Teeli. Data Sheets. Johns Mam die 2. r. Jones. Insulation of Rotating electrical Machinery, F.ng. FJect. J.. 1.7 I GO (195.7) .1. I . I . Schulman. 'A New Commutator Oar Insulation', Westinphottsr Fngr, 7. Gl (1>M7| 4. `Uses of AsIk-sIos IV.jrcr'. Asbestos Faetbook, 1944, Asbestos. Philadelphia 5. I S Patent 2.49.7.604. Instdatinx Paper of Asttestos and Bentonite, T. R. Walters to (iencral t Icctrie Co. G. U.S. Paten 'so 77.1, As/tesfos Impregnated with Tin Oxide and Process of Produeine. tllinan to (iencral Tlcctric Co. 7. Itiilish Pat.iil n -.692. Asbestos Paper Products, Raybestos-Manhattan Inc. H. Itiilish Patent 72'.711. Asbestos Paper Palp. Rayhestos Manhattan Inc. 9. Itiilish Patent 759.119. I'io,Italian of Asbestos Paper. Rayhestos Man hattan Inc. 10. Asbestos Pio,ha is. Rayhestos Manhattan Inc. Bulletin No. T-1956 11. M .1 (VI cary. It W. Sciihncr, J. K. Missimer.and .1. J. Trying. 'Manti- lactiuc of I'.ipci (tom (ilass eibres*, T.A.P.P.I.. 35. 2X9 (1952) 12. M .1. 07 cary. R. II. Ilohhs, J. K. Missimer.and J. J. Trying. `TITccts of Mechanical Preparation and pit on the Strength of (ilass fibre Paper', li t P.P.I.. 37. No. 10(1954) I. 7. M J. O leary and D. Iluhhard. 'Some Properties of a (ilass Used in Paper Manufacture'../. Res. not. Bin. Stand..55. No. I. Research Paper 2599 (19551 14. libcrxlns Products for Papermnkim; (Booklet GL2, Al. Owens-Corning liherglas Cotpn.) (I eh. 1954) 15. t.I.S. Patent 2.694.670. Sized IFafeelaid Glass Fiber Products. American Cvanamid Co. IG. U S. Patents 2.G92.220. 2.65R.84S. and 2.728.699. Glass Paper. Dominick l.al'ino 17. British Patent 769.6X7. Glass Fibres and Plastic Sheets and Films. American Machine and l oiimlrv Co. IR. British Patent 751.485. Sheet Material of Fibrous Cellulose and Glass Fitnous Ravine. Hawley Products Co. 19. British Patent 659.9X9 and U.S. Patent 2.604.424. Glass Fibre Reinforced Ctepe Papet. British Thomson Houston Co., Ltd. 20. U.S. Patent 2.770.940. Glass Fiber Tivinr, Owens-Corning Tihcrglas Corpn. 21. ` I ilw-tfrax Papet'. lech. Data Sheet. Carborundum Co. (1956)