Document 6R0XDMLkexygE7QNVkmj54dn6

JUtMfih Ka> Vol.2. 3 TJ L L E T I N Wo. 4-. July, ii.UgU.3 o ; 1961. Editor: C.Z. 3r. !Tr*c j- " __r\ y->0 oj rw\' nX. uc rART 1 I>IIWING............................................................................ r.iri'T Oc. O Oa* CJT>TCrrOvC: T--TT(r_L?. rART j O-CJL ^ X" V.O A. ---A- i * RART RART RART --/* * cj^TTcrnOpcOj ^T^0Trv:T 7T' -TLT_'-T ' T>0'tr jr P i^JTj?JT.1,i'T^17L*nI,tDvAr,TJ--T^\ AT--tA1 iUy'xnlTuOn; OC 'j;0 7*_ ^\AT-A^-~>rrA\."_--__r<_.A:_/ ^ ^Oj-T*l\'xT_*j--. a7'vr*J .rilIl-'LT/^ .'"'.'V rTT71'7i-'<lJ O'w .i-- 'JkjJ. -- J. \J1`. u .** RART 7 PLASTIC MATERIALS AWL PIPES ........................... PART 8 A-S3EST0S PAPER AWL INSULATING MATERIALS RART 9 REPRACTORY FIBRES ................................................. PART 10 MISCELLANEOUS .......................................................... PART 11 REVIEW OP JOURNALS ................................................. ICO 118 120 12 3 124 128 129 (C) Copyright, Astex publishing Co., 1961. ASARCO ALV 0006529 ASBESTOS bulletin IOC part 1. MINING *"----- CANADA 410 McADAM WILL DRILL - ASBESTOS PROSPECT. Can. Mining Journal 1961, 82, No.6, p.134. Following a magnetometer survey of the property, McAdam Mining Corp announces it will commence diamond drilling after the break-up on its asbestos prospect at Roberge Lake, northeast of Chibougamam, Quebec. It is stated the magnetometer survey has indicated that an asbestos bearing zone, which was discovered and trenched fairly ex tensively several years ago, may extend for a length of 2,200 ft. In this trenching asbestos occurrences were nc~ed ever a strike length of 1000 ft., and across a width of 600 ft. (complete afcstrac 411 Q0i3EC. The Mining Mag., 1961, 105, No.l, p.35. In I960, Lake Asbestos of Quebec Ltd. treated 1,650,510 tons cf rrck and recovered 86,621 tons of fibre. Production at the Black Lakenine is expanding, the 1959 output being 55,890 tons. A drilling party has been sent to its asbestos property in Ungave by the Murray Mining Corp. Pour sampling holes 25 ft. are planned. Work tc date has, it is stated, outlined 11,681 ,260 tons of ore averaging >218.5 a ton (complete abstract). 412 USE OF CONCRETE IN MINING AT THE JEFFREY" MINE D.P.R.Smyth. Can. Mining and Min. Bulletin, 1961, 54, N590, p.455. Asbestos ore at Johns-Manvilie W. Jeffrey mine is mined from a large open pit and by block caving from underground. Concrete has been a most necessary and important aid to mining and has been used to replace other more expensive materials. It has eliminated fire hazard and made working conditions safer. Pipe-line concrete avoids interference with the normal mining operations. The pneumatic placer snd the pipe-line, in conjunction with a proper batching method, can deliver concrete to any point in the mine at a very reasonable cost per yard. RHODESIA. 413 Asbestos Production for the 12 months ended 30th November I960 amounted to 133,963 tons valued at 7,471,905* ASARCO ALV 0006530 101 ASBESTOS BULLETIN u.s.s.r. 414 STRUCTURAL PECULIARITIES AMD GENESIS OF XIEMBAISKOE DEPOSITS OF CHRYSOTILE ASBESTOS. V.N. Kuznetsova. Sov. Geologiya., I960, No.8, 39-49. Kiembaiskoe deposits take second place among all xlie asbestos deposits in the Soviet Union. The genesis of the chrysotile asbes tos veins, their characteristics, types and dimensions of fibres etc., are described in detail. 415 TUVIN3KAYA AUTONOMIC PROVINCE - THE SECOND ASBESTOS BASE OP THE SOVIET UNION. V.F. Eremeev. Sb."Razvitie proizvodit. sil Vost. Sibiri. C-ecl. i mineralno-syr'evaya baza", AN SSSR, Moskva, I960, 30-43. With the discovery of Aktovrakskoe deposits of chrysotile asbestos, in addition to Maloc Ayangatinskoe and Shurmakskoe deposits, Tuvinskaya Autonomic Frovince became one of the most important bases of the asbestos industry in the Soviet Union, The genesis of the Aktovrakskoe deposits, the characteristics of the veins, etc., are described in detail. 416 AMPHIBOLES IN MAGNETITE AN! PHLOGOPI'iE PC ^.inirONo OF jiLiinN. D.P. Serdyuchenko. Sbornik "Zhelezn. rudy Yuzhn. Yakutii, Moscow, AN. SSSR, I960, 326 -357. Amphiboles in crystalline schists, certain granites, contactmetasomatic and skarn formations of magnetite and phlogopite ores or nldan appear usualljr in the form of hornblende, hastingsite, pargasite, actindite or tromolite. Chemical analyses, K-rav dia grams and heating curves of these minerals are given. The genesis of amphiboles and consecutive transformations in the series pyroxene hornblende - tremolite - phlogopite are described. 417 AMPHI30LE ASBESTOS ON THE WESTERN SIDE OF SUBARTIC URAL M.V.Fishman and B.A.Goldin. "Tr.Komi fil. AN SSSR", 19595 No.7, 103-107. Amphibole asbestos has been found in diabase-perphyrite formations (near Sabli). Asbestos veins with cross fibres appear in fissurc-s and cracks where hydrothermal solutions have leached and transformed adjacent rocks. The composition of this asbestos corresponds to that of the actinolite-tremolite series. Chemical and optical prop erties of two local modifications are described in detail. ASARCO ALV 0006531 aS3EST0S bulletin PETROGRAPHY AND MINERALOGY OF ASBESTOS DEPOSITS. Trudy In-ta Geolog. Rndn. Mestorozhd., Petrogr., Mineralcgii Geokhimii, AN SSSR., I960, No.47, 76 pages. MALAYA 4X9 THE GEOLOGY AND MINERAL RESOURCES OF THE KINTA VALLEY, PERAK. F.T.Ingham and E.F.Bradford. Mem. geol. Surv. Malaya 9, I960, 347 pp. General, structural and economic geology are discussed. Asbestos is among a number of mineral resources noted. 420 DETERMINATION OF ASBESTOS FIBRE IN SLUDGE FROM DRILLHOLES IN THE 3ARYULGI DISTRICT, i'l. S. vV. <J. d . r.enicel Ore Dress. Invest. Univ. Melb. Nc.597 , May I960, 8 pp. Certain samples showed fibre contents up tc 6$; no assessment of the quality of fibre was possible because of the condition of the sludee and absence of core samoles. 7..*_"Tipi.u-TXVj*M' 421 GEOLOGY AND ASBESTOS DEPOSITS OF THE TAITA HILLS, KENYA. O.C.Farquhar. WITH AN APPENDIX ON THE MAKINYAMBU MINE, by L.D.Sanders. Mem. gecl. Surv. Kenya No,2. I960, 110 pp. General structural and economic geology are described. The asbestos occurrences are examined in detail. YUGOSLAVIA 422 CROCIDOLITE ASBESTOS OF HALILOVCE IN BOSNIA. S.Pavlovic and R.Milojkovic. Acad. Serbe des Sciences. Bulletin. Sciences Nat. No.7, 1959, 95-96. Crocidolite mined in the vicinity of Halilovce is greenish-blue, its fibres are very thin and up to 5 cm. long; its refractive index varies from 1.658. Probable genesis of the formation is discussed in detail. i ASARCO ALV 0006532 swotwsb* iwww . 103 ASBESTOS BULLETIN BRAZIL 423 MINERAL RESOURCES OF 3RAZIL. VOL.l. NON-METALLIC MATERIALS. S.F.Abreu. Rio de Janeiro: Ministerio do Trabalhon Industria and Comercio, Instituto Nacional de Technologia, I960. In part V, insulators and abrasives are described, incl. asbestos, diatomite, vermiculite, etc. PART 2. ASBESTOS-CEMENT 42A PROTECTIVE JACKETS FROM ASBESTOS-CEIvIENT PIPES FOR METALLIC PIPES USED IN OFF-SHORE OILFIELD INSTALLATIONS. M.8.Alekperov and I.M.Kershenbaum. Stroit. Mat., 1961, No.6. 2A-25. Parts of metallic piles or tubes which are affected by sea-water corrosion are protected by means of jackets. Described in detail. 425 "ASBESTOS-CEMENT INDUSTRY ABROAD" ("Asbestctsementnaya promyshlennost' za rubezhom") V.G. Fel'zenbaum. Gosstrcuzdat, I960, pp.143. The technology of asbestos-cement industry in the U.S.A. and other countries is discussed in detail. 426 GOST FOR PLASTIC PACKING RINGS FOR ASBESTOS-CEIvIENT WATER PIPES. Byull. Stroit. Te-knik.-, 1961, No.6. p.15-16. GOST (Russian Standard) 5228-60 is to replace GOST 5228-50. It relates to the dimensions and pnysico-mechanical properties of clastic packing rings for joints of asbestos cement waterpipes ; (GOST 539-48), working under pressures of 5, 8 and 10 atm. 427 NEW UNITS AND COMPONENTS MADE FROM ASBESTOS-CEMENT (RESULTS OF A COMPETITION). Tech. Translations 5, 10, 567 (May 31, 1961) Zhukov K. Arkhitektura SSSR 1959, 2, 6-11. 13p. translation 61-15924 available from Library of Congress: microfilm $2.40 or photostat $3.30. ASARCO ALV 0006533 ASBESTOS BULLETIN 104 428 DESIGNING AND CONSTRUCTION OF GAS MAINS USING ASBESTOS CEMENT PIPES. V.S.Loginov and G.A.Yakovlev. Stroitelstvo Truboprovodov, 1961t 6, No.4, 25-27. Special asbestos cement pipes of a diameter of at least 100 mm. are used; maximum working pressure is 0.05 kg/cm2. Farts of pipelines may consist of steel pipes, depending on local conditions (bridges, channels, etc.). The asbestos cement pipelines are laid at a depth of 0.5 - 1 m. Methods of installation, checking for tightness, etc. are described in detail. 429 UTILIZATION 0? THE HASTES OF ASBESTOS BUSTRY FOR THE PRODUCTION OF CONCRETE AND OTHER Bull :G MATERIALS. N.D.Reshetnyak and Yn. L. Torch'ev. T Kharkovsk. In-ta Inzh. Zh.-D. Transp., I960, No.36, 12 Wastes of Factory No.3 of the "Soyuzasbest" combine were subjected to minercicgical and petrographic analysis. It has been found that the wastes can be used as coarse fillers for concretes. Their use for the production of serpentinite cement requires some enriching operations because of a high content of non-serpentinite asbestos material. 430 UTILIZATION OF CKRYSOTILE ASBESTOS AS AN ADDITIVE TO BITUMINOUS MATERIALS USED FOR THE CONSTRUCTION OF ROAD SURFACES. R. Ariano. Strade, I960, AO, No.11, 577-589. 431 PROCESS CHANGE ZOOMS OUTPUT OF ASBESTOS BOARD MILL Chem. Processing 1961, 24, 5, 128-130. News note about the installation of an impact mill made by Entoleter Division of Safety Industries Inc., and installed by Johns-Manville in its Nashua, N.H. plant. 432 CORRUGATED ASBESTOS ROOF FOR LOW COST HOUSING. Arch. Record, 1961, 129, 175. iL ASARCO ALV 0006534 3~- 105 ' ASBESTOS BULLETIN 433 CONVEYOR LINES FOR MAKING CORRUGATED ASBESTOS-CEMENT WITHOUT TEMPLATES !" j I. A. Ivanov i Director of Belgorod asbestos-cement group. c ; The introduction of conveyor lines for making corrugated asbestoscement without templates offers wide prospects for a complete mech- , anization and automation of the asbestos-cement industry. The first such line, which was suggested by the Inventor, I. A. Icherneto, was installed and is at present employed within factories of the Belgorod asbestos-cement group. The basic item of the line is a conveyor of preliminary hardening (setsing), the adoption of which fundamentally changes +he existing process cf making asbestoscement. Instead cf corrugating (moulding) the sheets cn metal templates, The asbestos-cement sheet, as it comes off the forming bowl, is ! stretched.on trucks of a constantly moving conveyor. The corrugating | operation, trimming of the edges, and compressing takes place as the 1 sheet moves forward. After that, the sheets proceed into the chamber of preliminary hardening. Thus, moving from floor to floor at a temperature of 65 - 80 deg, C, they become strong enough to be stack ed after 50 - 60 min. The hardening process is accelerated to a great extent by the action of washing the sheets all round by a heat carrier (hot air). After leaving the conveyor of preliminary hardening the sheets are stacked on pallets, and then, by a crane placed on a conveyor, they are lowered into a water tank for hardening. The water temperature, in the tank, like that in the chamber of preliminary hardening, is kept in the limits of 65 - 80 deg. C. Since the process of harden ing is carried out under water, the strength achieved in 16 - 18 hours is equal to that of 7 - 10 days with the present process. The .._______________ ____ A_J-J ASARCO ALV 0006535 t asbestos bulletin 106 conveyors - one of preliminary hardening and the other for water jjardening - form a 90 m. long production line. The former under went prolonged trials in one of our group's factories, and the first series of material produced by this method has already been deliver ed to their customers. As for the conveyor for the water hardening process, similar installations were introduced a long time ago in many pipe-making factories, including ours, and have entirely just ified themselves. Without any fundamental alterations the equipmenx will be employed for water treatment of corrugated asbestos-cement. At present, preparatory work is being carried out in the group-':* factories cn re-ecuiping two other production lines. These lines are laid out according to C. Tchernetois invention. As seen cn the figure 1, the conveyor of preliminary hardening will be placed over that of water-.hKrdening. This will net only make the production line shorter by half, but will also simplify re moval of the hard sheets from the conveyor's trucks, and the subse quent stacking and placing of the stacks into the tank for water hardening. Such an arrangement allows use to be made of the return ing trucks aid also shortens the conveyor's length or height by 10$. Furthermore, the water conveyor's dissipated heat is utilized and the loss of heat in the chamber of preliminary hardening is reduced as far as the outlet openings because the. trucks are situated at one end of the conveyor. To enable the removal of the hard sheets from the head end (in stead of the tail end, as in the original layout), the conveyor has the shape of an arch, under which the stacking equipment is placed. The asbestos-cement sheet, which proceeds from the conveyor, is stretched on the conveyor's moving truck, corrugated, and slightly compressed along the crests of the corrugations. The edges are trim med by means of a high-pressure water jot. This secures a better quality cut than the conventional trimming by discs. r ASARCO ALV 0006536 T 107 ASBESTOS BULLETIN The truck with the sheet on it proceeds further into the hard ening chamber. Moving shuttle-wise upward in surroundings with a temperature of 65 - 80 deg. C, it reaches the stacker in 50 - 60 min. Removing and stacking is carried out bymeans of vacuum suction, A lifting mechanism, working on the principle of auto- or electro-lifting gears, will be used to load the stacks on thec.eo.nveycr for water hardening. It can be hydraulically or mechanic ally operated, with the forks placed at a distance slightly wider than the width of the conveyor belt. By lowering the forks ben eath the latter, they leave on it the pallet with the sheets. The lifting device must operate in a similar way. The forks can be turned through 180 degrees, thus enabling the placing of a stack of ready products on the belt or its removal from the forks by means of an auto- or electro-lifting gear or crane. In this way, very favourable conditions are created for a complete automation'of the asbestos-cement manufacturing process. 434 ASBESTOSIS - EPITTMCLOC-ICAL STUDY IN AN ASBESTOS-CEMENT PLANT. Cantellano j.lvarado, Luis and ethers. Salud Publiva Mexico, 1S'60, 11, 557-566. ( 435 B.P.370,054. IMPROVEMENTS IN IMPREGNATING CEMENT-BONDED ASBESTOS BOARD. Midland Silicone Ltd. Cement-bonded asbestos board is impregnated with a solution of a polysiloxane resin. Such a treatment improves the electrical prop erties of the material. V ASARCO ALV 0006537 Fig.l, Mechanized production line. 1.Convenor for preliminary hardening: 2. Conveyor for rater harden ing: 5.''transporting belt - stacker of sheets: 4. Corrugating equipeent:~5. Compression rollers: 6. stacking device: 7. uoaeing~device: 8, rifting device: 9. Transporting belt for ready products. !! ^nrA:: I* rf/A>y pgr#a, hycro-cpeninc of asbestos-cement. piping for water supply into the mircr.piping of the mixer's closed cycle, reflector disc. corner pieces holding the disc. ni.xer of the asbestos-cement suspension. worm for opening and closing the stop-cock. centrifugal pump, 53N - 150 piping from tfea pump to the scoop mixer piping to ths stop-cock piping from the stop-cock to the scoop mixer, piping for water supply to the mixer, piping for transfer of asbestos-cement suspension from the mixer, piping from the mixer to the stoprcock. i i ASARCO ALV 0006538 asbestos bulletin l-io 436 MACHINERY FOR 'THE HYDRO-OPENING OF ASBESTOS V.V. Firulin, Director of Krasnoyarsk Asbestos-Cement Products C-rout). The method adopted by factories in the asbestos-cement industry has many considerable shortcomings It is too ascd on low output machinery - edge runners and hollanders. .sxuilaxicn of which requires considerable space. To improve the existing method of opening and to make it more productive, the rationalizers of the Krasnoyarsk group suggest ed that in the place of hollanders, machines of a new construction, working on the principle of hydro-opening (hydro-pulping) should be employed. This consists of a cylindrical tank with a conical lower part and 6 my capacity, centrifugal pumps, and piping. This opening of the asbestos and the preparation of the asbestos-cemenx suspens ion is illustrated by the sketch. In a special mixer of 2.5 n-' cap acity (the nixing blades being rotated ty a 10 h.p. electromotor) the asbestos suspension is prepared and pumped by a centrifugal pump (SHN - 150, with a capacity 150 sr/h) into the hydro-opening tank which is hand furnished with 1.5 of water. To the conical part of the tank is connected a second centrifugal pump which sucks the suspension through a pipe and returns it back into the tank. The tank is provided with a nozzle which allows adjustment of the dia- ' meter of the opening and consequently the velocity of the stream. Y/hile the suspension is hitting with great force and velocity the reflector disc which is installed inside the tank, opening of the asbestos fibre takes place. After the opening is completed, cement suspension (prepared in the same mixer in which the asbestos suspension was made) is supplied to xhe tank. To obtain a better contact of the cement particles with the asbestos fibrils, the blend is pumped once more through 'i 1 ASARCO ALV 0006539 r 1 1 | ASBESTOS BULLETIN the tank, and only then is it let out into the scoop mixer. In the first instance the unit was equipped with a pump, 5 NDV, which ach ieved opening degree of 90-96$ in 1.5-3 minutes. However, the concentration of the blend was only 12 g/l00cm^. It was necessary to install another centrifugal pump, SHN - 150, and after that the concentration of the blend reached the technical standard, but the degree of opening was reduced down to 78$. At present, members of the group are solving the problem of increasing the degree of opening at the same productivity rate by improving the unit. UM,ingfl Ul .tiliL3r`JU > m u * 437 German P.1,110,389. HOOF SUPPORT, ESPECIALLY ROOF RAFTER, PROVIDED WITH FRAMEWORK ANCHORED IN ROOFING SLAB. Rheinbau G.m.b.H. Roofing plate consisting of asbestos cement or plastic, is provided,on its underside, with a ribbed layer of concrete in which the.upper booms of the framework are encased. H T fv rrw fT d H itir** 438 U.S.P. 2,973,783. STRUCTURAL FORM PRODUCTION. C.F.Boe. Method of production of structural units from an aqueous mixture of asbestos-cement is described. i{ 439 U.S.P.2977,276 MACHINE FOR THE MANUFACTURE OF AS3EST0S:j CEMENT PIPES, Johns-Manvi lie Corp. | i A machine for the manufacture of asbestos-cement pipes by a contin uous process is described. 440 U.S.P.2,975,833. MACHINE FOR THE MANUFACTURE OF ASBESTOSCEMENT SHEETING. A.Magnani. An apparatus for manufacturing sheets of large size from a slurry of asbestos fibre and portland cement, the surface of the suction roller is provided with ribs forming channels which are externally defined by the web and which communicate with the suction source through out- let ports of the cylinder. H ASARCO ALV 0006540 asbestos bulletin 112 iAX GERMAN PATENT 1,080,010. HYDROPHOBIZATION OF ASBESTOSCEMJNT PRODUCTS USED AS BUILDING MATERIALS. Th. Goldsmidt A-G TECHNOLOGICAL PROCESSES IN THE MANUFACTURE OF ASBESTOSCEMENT ARTICLES. P.N.Sokolov. Moscow, Gcs. iza-vo lit-ry po stroit., arkhit. i stroit. mat., I960, p.394. 443 FLINTKOTE TO BUILD jftO MILLION ASBESTOS-CEMENT PIPE PLANT. E & MJ Mineral markets. 1961, 32.? No. 29, p.6. A plant having an annual capacity of 46,000 tons is to be built at Kavenna, Ohio, under a licensing agreement with J-M. 444 BRITISH P.858,790. MGULDII ASBESTOS-CEMENT PIPES. liarchioli. The inflatable core of.the parent specification is modified by the end cf xhe yieldable ring having closed end, whereby the ring ccmpleTely closes the end of the inflatable member. 445 BRITISH P.858,017; 858,720. MOULDING FIBRE-CEMENT ARTICLES. Commercial Casanova S.A. The parents describe a method of moulding wherein the water expre ssed from the mass moving in the mould is forced into one cr more than one water-collecting layers which covers the moulding space and comprises three elements; an outer impervious covering having holes in communication with a water-receiving space, a centre layer of metallic mesh and an inner fabric layer. 446 BELGIAN PATENT 596,897. MINERAL FIBRE SHEETS, Turners Asbestos Cement Cc. Mineral fibre sheets consisting of mineral fibres and a hydraulic binding agent are produced with the aid cf a machine of the wet type, in v;hioh a rotating c5dLinder is contacted with a suspension of the, binding agent and fibres. A tc-and-fro movement in a direction roughly parallel to the cylinder axis is imparted to the fibres by an agi~atcr, so that fibres in the peripheral vicinity of the cylinder, which are set in motion by the cylinder in the course of its rotation, are disposed at random. 'I ASARCO ALV 0006541 **e 113 ASBESTOS BULLETIN PART 3. ASBESTOS TEXTILES 447 FIGHTING THE DUST IN ASBESTOS TEXTILE FACTORIES BY DAMP SPINNING AND WEAVING. A.J.Cells. Plaste und Kautschuk, I960, 7, No.11, 560-561. Increasing the moisture content of asbestos fibres by about prior to spinning or V! caving, reduces the concentration of asbestos dust in the air to about one-third as compared with dry spinning. However, small asbestos dust (particles of about 2.5 microns) is not reduced by this treatment. The process is described in detail. 448 HEALTH PROGRESS IN ASBESTOS TEXTILE WORKS. J.Mitchell. Arch. Environmental Health. 1961, _3 1, pp. 37-41. Dust counts taken in 1936 are compared ate the great improvement. hose cf I960 to indic- 449 3.?.869,312. TREATING FI3P.0U Johns-ManvilLe Corn. The method and apparatus is especially suited for use in the cleaning cf asbestos fibre to remove unwanted particles, such as dust, and is also intended for use in separating asbestos fibres cf various length. 450 B.P.852,157. v;cx T TAPE-LIKE RESISTANCE HEATER ELEMENTS. T. French & Sons Ltd., J.Sellers, and T.E.Peace. 451 U.S.P.2,947,328. ASBESTOS DRYER FELT. V.D.Asten and J.G.Schoepf (Asten-Hill Manufacturing Co.). 452 U.S.P.2,948,641. TREATMENT OF ASBESTOS FABRIC. Thermoid Co. In order to render asbestos fabric flameproof and to improve its flexibility etc., a mixture of fluoborate salt, mica and plasticizer is applied to it. 453 U.S.P.2,971,615. TREATMENT OF ASBESTOS YARN. Nalco Chemical Co. Asbestos yarn for the manufacture of brake lining is impregnated with silica aerogel or the like and then dried. I ASARCO ALV 0006542 "'I AS3EST0S BULLETIN 114 454 U.S.P.2,972,221. NOVEL METHOD OP I^NUFACTURING ASBESTOS YARN. Rex Asbestwerke Graf von Rex. * The colloidally dispersed asbestos fibre in an aqueous medium is extruded through a forming channel. 455 CAN.?.616,813. APPARATUS AND METHOD FOR OPENING ASES3T0S FIBRE BUMBLES. Johns Manville Corn. 456 FIRE RESISTANT PIPE. Modem Plastics, I960, 38, No. 3, ?.15S. Synflex Products Div. hose originally developed as paint carrying drop lines for car manufacturers to reduce fire hazard in spray painting consists of a central nylon core tube covered v/ith vinyl, and wrapped v/ith Mylar-bached asbestos tape. The cuter covering is 0.012" galvanised steel amor. PART A. ASBESTOS FRICTION MATERIAL; 457 PASSENGER CAR BRAKE TESTING, The Engineer, 1961, 24, No. 3, on. 4^4-450. Two papers presented by A.E.Livsey, A.F.Prestidge and D.F.Ivlcor at a recent meeting of the Institution of Mechanical Engineers are summarized. 458 TESTING OF CLUTCHES FOR DESTRUCTION. Automobile Engineer, June 1961, pp.224-227. A new burst chanber for high speed testing of Borg and Beck clutches has been designed and installed by Automotive Products Group in their new test house. 459 COOLING HOT 3RAXES. I.G.Hicks. Product Engineering,' 1961, 13, No.2, pp.57-59. A nomograph is nrosented which givws a rough idea of the time required by a brake subjected to short hard stops, to cool off before it is ready for the next stop. A second nomograph gives the arum.,radiating surface area required to keep the brake temperature rise within allowable limits. ASARCO ALV 0006543  115 ASBESTOS BULLETIN 460 BEARINGS FOR 1000F AND ABOVE. Product. Eng., 1961, 32, No.33, p.12. No commercial materials have been developed specifically for use in hearings at 1000F and above, but a survey by Battelle Memorial Institute shows that several cemented carbides and cobalt-base alloys should be serviceable under rolling-contact conditions at least to 1300F. For sliding conditions nickel-base and cobaltbase super-alloys, cemented carbides,-some cerments and a few pure ceramics all look good. Above 2000F, intermetallics, graphite and some ceramics may be considered for potential bearing applications, but graphite, at present, appears to be the^only material suitable for sliding-contact applications above 3G00~F. -or i'l^w /-.iiilxvii c. epoxy resin is reported by Russian ana bending strengths equal to these of po plastics. It surpasses them in chemical a: hesive properties, and low Source: Review of the Soviet Technical rr of Technical Services, 'Washington 25, D.C. 'ide rubber and to have tensile ar resistance, ad- 28.1951, Office !I ( ( j 462 BRITISH P.846, 337. MnlAL FRICTION ELnLmNT. .America Brake Shce Co. A sintered powdered metal friction element comprises a heat conduct ive metallic matrix or iron or copper with the addition of tin and a dispersion of 5-50# by weight of highly angular particles of sillimanite AloSiO^. Up to 10# by weight of graphite or lead is added as friction modifier, the mixed powders being preferably cold pressed and sintered under light pressure or^hot pressed. Iron based com positions are sintered at 1800^-2000~F and copper based composition at I500-1700r, a pressure of 150 psi being maintained during the sintering operation. 463 BRITISH P.856,022. SINTERED METAL FRICTION ELEMENT. General Motors Corp. A porous sintered meta.1 friction element comprises a ferrous base metal and 20-32# by weight of graphite in which the graphite consists of a mixture of powdered praphi'te and flake graphite. t ASARCO ALV 0006544  ASBESTOS bulletin 116 STOPPING PROM 100 M.P.H. R.N. Kemp. Automobil Eng. 1961, Febr. pp. 48 - 49. jests were carried out by the Road Research Laboratory on a 1957 standard production sport type car fitted with hydraulically operated, vacuum-assisted, self-adjusting disc brakes on all wheels. The mean- breaking distances obtained in these tests were 47 ft. from 30-mph, 185 ft. from 60-mph, and 515 ft. from 100-mph. 465 THE DETERMINATION OP THE ABSORPTION PROPERTIES OF ASBESTOS BRAKE LININGS. A.F. Willert and J.I. Kostyerin. Kauchuk. i. Rezina, I960, 1_9, No. 11, 24-28. Standard methods of the determination of the relative absorption of water and oil by asbestos brake linings are described in detail. PART 5. ASBESTOS REINFORCED PLASTICS. 466 BEHAVIOUR OF FLA3TICS IN RE-ENTRY ENVIROMENTS D.L. Schmidt Modem Plastics I960, 38, No. 3. pp. 131-140 The performance of phenolic-asbestos mat is compared with other fibrous materials. 467 ASBESTOS-PHENOLIC MOULDING COMPOUNDS. Materials in Design Eng. 1961, 53, No.6, p.7. "A series of asbestos-phenolic moulding compounds are recommended for ablation applications. Two grades are available: a gneral purpose compound for use up to 3500 F and a high temperature compound for use up to 6000 F. Some typical applications are insulations for re-entry vehicles and rocket motors; Source: U.S. Polymeric Chemicals, Inc., Canal & Ludlow Sts., Stamford, I Conn." (complete abstract). 468 B.P. 873,974: FIRE RESISTANT FOAMS. Hooker Chemical Corp. Asbestos fibre may be used as a reinforcing agent. ASARCO ALV 0006545 117 ASBESTOS BULLETIN 469 ASBESTOS-PLASTICS COMPOSITIONS USED IN ROCKETS J.J. Mobilia and D.V. Rosato. S.P.E. Journal I960, 16 No.8. 949-952 The use of asbestos in rochets is constantly increasing. New compositions consist of heat-resistant plastics, filled with quartz and graphite and reinforced with asbestos fibres. 470 PHENOLIC RESINS. Chem. Eng. 1961. 68, 13, 80. News note on silicone - and polyamide-modified phenolic resins produced by Zeichhcld Chemicals, Plyophen 23-017 and 23-057, which can be used for heat-resistant laminates. Fillers such as asbestos improve their properties. 471 Gem. P.1 ,103,579. PROCESS FOR THE PRODUCTION OF PLASTIC MATERIALS BY CURING POLYEPOXY COMPOUNDS. Henkel & Cie. Polyepoxy compounds are hardened by heat treatment and the action of curing agents. Numerous fillers, including asbestos, can be added. 472 US.P. 2,987,880 Insulation for Rocket Motors. Phillips Petroleum Co. This invention contemplates a laminate made up of the following components: a sandwich of aluminium foil between two layers of ceramic fibre paper adjacent to the motor case; and then a layer of phenolic resin impregnated asbestos. Preferably another layer of aluminium foil is also employed next to the asbestos layer. 473 CERAMIC ADHESIVE. Mat. in Design Eng., Aug.,1961, p.174. A paste-like ceramic adhesive is now available from Melpar, Inc. It is claimed that it has high bond strength at temperatures up to 2600 F. It is particularly well suited for bonding graphite, zirconia, alumina and other nonmetallic materials. ASARCO ALV 0006546 -> i ASBESTOS bulletin 118 ptRT 6. ASBESTOS PACKING, JOINTING, SEALING AND --' COATING COAPOSIIXONST 474 Germ.P.1,104,775. PACKING RING. Goetzewerke Friedrich Goetze A.G. Ihe ring consists cf a corrugated annular member made of a metal sheet, housing in its grooves concentric rings made of rubber or plastic cords (internal rings) and asbestos ccrds (external rings). 475 SIMPLE COMPRESSION PACKINGS. Id.M.main and E.H.Stubenrauch. Machine Design, 1961, 19, No.l, pp.51-57. Compression packings create a seal"by being squeezed between the threat cf the box and the gland. It requires frequent gland ad justment to compensate for wear and loss of volume. The types required for various conditions are listed and the most commonly used packing lubricants are given. 476 HOY/ TO CHOOSE A DYNAMIC SEAL. V.L.Peickii, D.A.Christensen. Product Eng., 1951, 20, No.3, pp.57-59. The 5 basic types of seal available to the designer are shaft seals, face seals, compression packings, moulded packings and labyrinth of positive-clearance seals. There are 17 different materials to choose from. A review of all the types and an exhaustive analysis of c-ach in terms of basic selection factors, materials and design recommend-- ations are given in this survey. 477 NEOPRENE-ASBESTOS GASKET IdATERIAL Product Eng., 1961, 32, No.29, p.6a. Short announcement of Rogers Corp., Rogers, Conn, new gasketing material for service against hot or cold oils of various types in fuel, lubrication .and hydraulic systems. It is claimed that it has compressibility _f yy*s at 1000 psi and 45$ at 5000 psi. Despite high compressibility, the material reportedly has excellent resist ance to stress relaxation and resultant loss of bolt torque. Its longitudinal tensile strength is 2100 psi and transverse 1100 psi. j ASARCO ALV 0006547 119 AS3EST0S BULLETIN 4r"8 PERFORMANCE 0? SOKE MODERN GASKET MATERIALS Mechanical World, June 1961, pp.208-210. A discussion of the basic factors governing the performance and selection of resilient seal materials and the properties of some typical modern compositions. A79 BRITISH P.853,525. IMPROVEMENTS RELATING TO ROAD-SURFACING COMPOSITIONS. Sentex Ltd. The composition for use in surfacing airfield runways, roads, pavements, loading platforms, railway-station pi- ''NY'rn3 j nny co^s^si/ of1* -- i-VC (Ccrvic HO) Anthracene oil Phiting Asbestos (7R) 50 J. 480 British P.850,796. BITUMINOUS COMPOSITION. ;oau Tar Research Association. A bituminous composition comprises a pitch cf coal ori air. and/or medium or heavy tar oil in which is dispersed 10-; 0$ cf a coal, Fillers such as asbestos, flour and polymers such as butadieneacrylonitrile copolymer may be added. | 481 Russian ?.135,396. MASTIC (CAPPING) I.K. Loronenleov. | A mastic for hot capping electro-vacuum equipment consists efr { Adhesive Mo.88 (Russ, specification) 32$,bitumen 10$, marble G.P.1,108,53. 482 GERMAN P.1,107,135. PROCESS FOR THE PRODUCTION OF DURABLE COATINGS ON SURFACE OF METAL SHEETS EXPOSED ON THE OPPOSITE SIDE TO INTENSIVE HEATING. H.Henning and T. Ascher. The invention relates particularly to the external coatings of ex haust pipes. The coatings consist of a binder and pigments and fillers. TiO, is a preferred pigment, and asbestos dust is a pre ferred mineral filler. Examples^cf the compositions according to the invention are given. 'I ASARCO ALV 0006548 XN ASBEST03 bulletin 120 ig3 TWO COMPONENT PUTTIES FROM UNSATURATED POLYESTERS. E.W.Laue. Gumni Asbest Kunststoffe 1961. 14, pp.532, 534, 536 & 538. jhe raw materials for and the properties of caulking compounds are discussed. Asbestos is one of the fillers mentioned. PART 7. PLASTIC BUILDING MATERIALS AND PIPES. 484 RIGID P.V.C. BUILDING PRODUCTS. British Plastics, 1961. 34, No.6, pp.334-335. They are Terrain system for soil ' warn air hoaxing and ventilation The Rynway rainwater system intr Yorks. Imperial Metals Ltd. ,nd waste drainage, roof drainage, reduced 'ey A.3. Plastics Ltd. need by Rodiand Tiles Ltd. and 485 PLASTIC FACED ?LAS; ER30ARD. Architect <$: Building News, 1961, 220, 2 p.76. Announcement of Paramount Plasterboard and Paramount Dry Parti now ava:`- lable with high i: pact plastic and vinyl coatings. on 486 GLASS FIBRE REINFORCED-PLASTICS ROOF LIGHT. L.G.Cwen. rlastics 1961. 25, 284, pp.283-84. Three designs are described. 487 P.V.C. COVERING. Plastics, 1961. 25, No.283, p.58. Six designs by Bernard Wardle (Everflex) Ltd., are to be used for wall covering and office partitioning in the new Shell Building at South Bank, London. A seventh is being used in the swimming pool. 488 VINYL SURFACING MAT IS ABRASION RESISTANT. Materials in Design Engg,, 1961. 53, No.6, p.176, 178. News note about a new Armstrong Cork Co. product called "Autoccrd" with a vinyl surface bonded to a, resin-saturated asbestos fibre backing. ASARCO ALV 0006549 121 ASBESTOS BULLETIN 489 WHICH FLOORING FOR THE LABORATORY. E.L. Lilly Building Mat. 1961, 2J_, No. 8, p. 114. The more scientific method of analysing the reaction of the chemical substances involved in the wear of a floor as its chemical constitution is being increasingly employed and this article is a contribution to such analyses. 490 Russian P.134,617. PRODUCTION OF POLYMER-BITUMEN TILES. I.V. Provir.teev. The tiles consist of a black bitumen layer containing bitumen, coumarin resin, stearin, talc and asbestos fibres and of a finish ing layer made of a powder mixture containing 7 - 9$ cf polyvinyl chloride, 3 - 5$ of dibutyl phthalats 2 - ifo cf techn. stearin, 8 - 12$ cf cyclohexanone-formaldehyde resin, 8 - 12$ of polystyrene and 60 - 70$ of pigments. The production method is based on hot pressing or calendering the- bitumen composition with the plastic powder mixture. I I I 491 NEW ASrECTS OF PLASTICS PIPE EXTRUSION. K. Lominighaus and Dinl. Ing. Schiedrun. Plastics I960, 25, No. 278p 497. ` Discussion on ways anc. means cf improving today's technique in so far as quality and output are concerned. ; ; ii ; 492 RIC-ID P.V.C. PRESSURE PIPE ON MARKET. Contract Journal 1961 No.4278, p 1.540. "Aspect" is the trade name for medium impact rigid P.V.C. pressure pipe made by Allied Structural Plastics Ltd. 493 RECENT APPLICATIONS IN CORROSIVE CONDITIONS OF RIGID P.V.C. PIPING D.A. TREBURG. CORROSION TECHNOLOGY. 1961, 8,7. pp 215-17. A number of applications of P.V.C. Piping are described, including its use for water supply and gas supply lines.. ! j ASARCO ALV 0006550 ASBESTOS bulletin 122 PART 8 ASBESTOS PAPER AND INSULATING MATERIALS. 494 German P. 1,107,067. PRODUCTION OP A DENSE ASBESTOS PAPER WEB. Clupak Inc. (N.Y.) A web consisting of asbestos fibres, asbestos powder and a small amount of a binder (starch or a resin) is subjected to a com pression in the direction parallel to its surface, being at the same time subjected to a pressure applied in the direction vertical to its surface. The product has improved mechanical properties. The method permits the utilization of low-quality asbestos materials. 495 AS3EST0S: GENERAL, MINING, PROCESSING (28th Continuation) Gummi-Asbest-Kunststoffe, 1961, _1_A, No.5, 416, 418, 420, 422, 424, 426, 428, 430. German (West and East) standards for various properties of asbestos paper and cardboard are compared with those of Czeshoslovakia; density, moisture (max), asbestos and binder contents, losses on heating, strength and content of acid-soluble materials are tabulated. Standard tests are described. Manufacture of asbestos paper and millboard is described in detail, including type and characteristics of raw materials, production processes, machines, etc. 496 ASBESTOS AND ITS PRODUCTS IN EOREIGN TRADE OF VARIOUS EUROPEAN COUNTRIES. Gummi-AsbestKunststoffe, 1961, 14,, No. 5, 458-466. Import and export of crude asbestos, asbestos paper and millboard, asbestos fabrics, sheets and various asbestos cement products in Switzerland,'Austria, Italy, Great Britain, France, Belgium and Holland are discussed in detail. Tables (relating to some other countries) are included. 497 Belgian P.597,025. INSULATION. Bohle Cie, G.m.b.-H. Thermal or refrigeration insulation comprises a layer of mineral fibres (glasswool, rock wool, asbestos fibres), a layer of foamed polyurethane and a flexible supporting layer of hard paperboard, corrugated board or fabric, or sheets of synthetic or other material. ASARCO ALV 0006551 123 ASBESTOS BULLETIN 498 Germ. P. 1,103,122. PRODUCTION OF RUBBER-CONTAINING PAPER, CARDBOARD ETC. P.D. Pamam Co. , Chicago. To an aqueous slurry containing up to 2$ of animal, vegetable or mineral "fibres (such as e.g. asbestos) is added a coagulating agent, and then slowly, a stabilized latex emulsion (under constant agitation with a gas). After the emulsion coagulates, the slurry is oassed through a machine of a type used normally in paper production. Instead of latex, an emulsion cf a synthetic resin can be used. osas .1 INSULATING ASBZSTCSIIIC. ,TE PRODUCTS. Volchek. Stroit. Mate . , 1961 , 7, No.5 o_i "Asbestcsilicate" materials, made from a mixture of silica, lime and asbestos, are characterized by good heat-insulating^ properties (thermal conductivity of 0.06-0.078 kcal/m.hr.and a high mechanical strength (flexural strength^cf 5-14 kg/cia ): their density varies between 200 and AOO kg/m-'; they can be used at temperatures up to 600"C. Experiment?.! work, carried cut at Inzenskii combine, is described in detail. Marshallite was used as silica material; asbestos, of a grade net lower than 6, was fiberized (more than 70/). Autoclave treatment was applied which resulted in a reaction between silica and lime giving the product good mechanical properties. 500 Russian ?. 136,225. PREPARATION 0? A HEATINSULATING ASBESTOS-BASE MATERIAL, D.K. Flyate, N.T. Dcdcnov, K.V. Khartke, E.G. Vagaba and A.E. Gushchin. In order to improve mechanical and heat-insulating properties of asbestos materials impregnated with organosilicon,ccmpounds and used as heat-insulators at temperatures up to 400^0., up to 10$ of cotton fibres is added, and the mixture is processed in machines of the type used in paper industry. 501 German P.1,108531- CORROSION-PREVENTING WRAPPING A. Hasenb. The wrapping, protecting metal pipes frem corrosion by alkalis, or acids consists of a fleece or fabric of glass or mineral fibres which are electrolytically coated with Cu, Cr, Ni or Ag, and of an anti-corrosion mass applied onto the said substrate. ASARCO ALV 0006552 ASBESTOS bulletin 124 502 ASBESTOS MOULDING SHEET. The Financial Times August 30th 1961, p. 11. An asbestos moulding compound has been developed in sheet fern. The material is not woven and is said to be not only readily moulded but also to have exceptional clean-ness when it is machined. A tough, pliable, asbestos felt sheet capable of withstanding operating temperatures of 5,000 degrees Fahrenheit or more for periods of at least 90 seconds, it also resists only slightly lower temperatures for very long periods of time. At the same time the mechanical strength of the material is claimed to be good while it is pliable, and tests have demonstrated an excellent resistance to abrasion. It will also withstand other forms of erosion. The compound uses a special phenolic resin which enables the asbestos fibres to be free-flowing during moulding processes. As a result, seams made in the material and other types of joints can readily be worked together in a rather similar fashion to putty. It can be moulded at both high pressures and low pressures, as desired. Xu 0 uXl* be used in sheets less than inch thick or more than i inch thick. Although originally developed-for defence purposes, it is expected to find widespread industrial applications where high temperature resistance, heat insulation, abrasion resistance, intricate moulding and good physical properties are required. (complete abstract). 503 ASBESTOS: GENERAL, MINING, PROCESSING (29TH CONTINUATION). Gummi-Asbest-Kunststoffe, 1961, t4, No.8. pp. 721-2, 724 Machines used for the production of asbestos paper are described. The production and properties of various grades cf pure asbestos paper are discussed in detail. Data relating to the chemical resistivity of antophyllite asbestos, crocidolite, tremclite, anosite and chrysotile are tabulated. PART 9. REFRACTORY FIBRES. 504 PROGRESS WITH REFRACTORY FIBRES. C.Z. Carroll-Porczynski. Engineering Materials and Design 1961, 4, 7, pp 418-424. Properties and uses of Refrasil, Potassium titonate, graphite and zirconium dioxide fibres are discussed; 7 tables, 14 figures, 35 references. ASARCO ALV 0006553 125 ASBESTOS BULLETIN 505 HEAT RESISTANT PLASTIC STRUCTURES WITH CONTROLLABLE POROSITY. Micarta Div., Westinghcusc Electric Corp., Hampton, S.C., U.S.A. Announcement of heat resistant plastic structures which are said to provide a new means of cooling rocket nozzles. The porous material can be made of glass, leached glass, cr quartz fabric bonded with a high temperature phenolic resin. Controlling the porcsity in the structure provides greater cooling where desired, as at the nozzle throat. "Cooling is effected by evaporation, by coolant flowing through the wall, and by the formation of an insulating film inside the nozzle. 506 OFF THE LOOM: ROCKET ABLATIVE MATERIAL. Missile & Rockexs, August 7, 1961, p.26. The carbonaceous materials developed by the H.I. Thomsen Fiber Glass Cc. , and designated as HITCO-C, have a purity of 96i= carbon, and are being fabricated in both fibre, end fabric form. The Company says the materials retain strength over a broad temperature range, and even show a strength increase at temperatures over 3000F. Compatible with most resin systems, the HITCO-C series can be fabricated by standard reinforced plastic techniques, such as high- pressure moulding ana tape winding. 507 REFRACTORY INORGANIC MATERIALS FOR STRUCTURAL APPLICATIONS. H.A. Pearl, J.M. Nowak & ethers. U.S. Government Res. Reports, I960, 34, Nc.2, p.177. Thirty-five refractory inorganic materials systems were evaluated in exploring possible techniques to prepo.re refractory inorganic materials into high temperature aircraft structural elements. The fabrication techniques were evaluated by the results of room temperature modulus of rupture, impact and thermal shock tests. The best over-all Bell Aircraft system was based on .003" aluminasilica paper impregnated with alumina-silica cement. Specimen of this system were tested at elevated temperature (2000F) for modulus of rupture, compressive strength, and compressive shear. 508 B.P. 871,577. CERAMIC FIBRE PRODUCTS. The Carborundum Co. This invention relates to a method and apparatus for forming ceramic fibre products bonded with colloidal silica. ASARCO ALV 0006554 ASBESTOS BULLETIN 126 509 AS REINFORCEMENT FOR PLASTIC Product Eng. March 27 1961, p. 9. A recent report from H.I. Thompson Fiber Glass Co. indicates that zirconia-phenolic laminates will have excellent short-term heat resistance, relatively low thermal conductivity and good flexibil ity. Structural composite, thermal insulation and ablation shields are among the possible application for this new material. Since Zirconia fibres can be made in both "wool" and filament form it should find many new outlets. 510 NUCLEAR FUEL IN THE FORM OF GLASS FIBRES. K. Lustig. Soviet Science, Glass and Ceramics, March I960. The author proposes that nuclear fuel elements be made of glass fibres containing oxides of uranium, plutonium or florium. Advantages claimed for this novel approach to the nuclear fuel problem are: chemical stability, thermal stability and heat resistance which make it possible to operate reactors of temp, up to 1,000 C; extensive possibilities for varying the content of fissionable material and using different type of fuel, continous removal of fission products by the liquid coolant o.nd of the replacement of fuel elements: and simplicity and low cost product ion. The author states that glass fibres containing uranium-235 has already been tested in Soviet reactors. 511 FUSED QUARTZ TAFE FOR HIGH-TEMPERATURE INSULATION. Product Eng., 1961, _32, No.29, P 8. Amersil Quartz, Hillside, N.Y. has fused,quartz tape ready for evaluation in sizes from 2 to 8 inch. (press announcement), 512 STUDIES OF METAL FIBRE REINFORCED CERAMIC COMPOSITE MATERIALS. E,Z. Stowe11 and Tien-Shin Lui, Southwest Res. Inst. San Antonio, U.S.A. The mechanical behaviour of ceramic materials at elevated temper atures is described from a phenomenological standpoint. The 'ai.scoelestic characteristics of both the ceramic material? and metals at elevated temperatures make possible the prediction of their behaviour. ASARCO ALV 0006555 t iWiiiiinm 127 ASBESTOS BULLETIN 513 CHEMICAL "DRAWING" PRODUCESTUNGSTEN FILAMENTS. Product Eng. August 7, 1961, p. 15. Electrolytic etching techniques -are now successfully being applied to production of fine tungsten filaments according to some Russian reports. The technique seems straightforward but there have been a number of problems in its application. Uniformity was poor owing to current fluctuations during etching as well as variations in the diameter of the original wire. Now substitution of dc to ac current, reduction in electrolyte concentration and shielding of the system from the disturbing effect cf air currents have brought substantial improvement. A 15-20$ solution of sodium hydrate is being used in a dual-bath system. (complete abstract). 514 METAL FIBRES USED IN RESISTANCE WELDING. Mat. in Design Eng. 1961, 54, Hc.1. ?. 164. An improved resistance welding technique uses a piece of fibre metal sheet between surfaces that are to be welded. The fibre metal sheet greatly increases the ratio of contact resistance to bulk resistance, permitting the metal in the fibre mat to reach its melting point quickly while the base metal remains cool. The improved welding method was developed by Armour Research. 515 B.P. 871,124. IMPROVEMENTS RELATING TO FUSED QUARTZ jNlBRES. Engi'nard Koncvia me. The method comprises passage of a gas flame at a temperature higher than the melting temperature of fused quartz, into an open ended combustion conduit, feeding said material into flame, passing a high pressure gas over the flame ana directing the flame ever the material during its passage through the combustion conduit, melting the material and fiberizing by means of high velocity and high pressure gas. 516 German P.1,108,388. A PROCESS FOR THE PRODUCTION OF QUARTZ FIBRE'S. Engelhard Industries, Inc. A process for the production of glass fibres by a stream of hot gases is applied to the production of quartz fibres. The gas temperature is above 1700cC, and the gas pressure is between 1.4 and 4.9 atm. gage. ASARCO ALV 0006556 asbestos bulletin part 10 MISCELLANEOUS. PULMONARY FUNCTION IN ASBESTOSIS OF THE LUNG. M.E. Bader, R.A, Bader & I.J. Selikoff, Am. J. Med. 1961, 30, 235-242. 128 518 PLEURAL CALCIFICATION AS A ROENTGENOLOGIC SIGN OF NON-OCCUPATIONAL ENDEMIC ANTHCPHYLL-ITE ASBESTOSIS. R. Kivilucto. APCA Abst, 1961 7, 1, p7. Acta Radiol. (Stockholm) Suppl. 194, 1-67 (i960) 519 Germ, ?. 1,106,734. PROCESS FOR THE CATALYTIC, FLAME-FREE BURNING OF GASEOUS OR LIQUID ORGANIC COMPOUNDS. Z.H. Helborger. Catalysts,- containing mainly oxides of chromium III and IV and, optionally, oxides of other heavy metals, are deposited on inert carriers, such as asbestos, kieselguhr, etc. 520 Russian P. 132,525. TREATMENT OF BRITTLE CHRYSOLITE ASBESTOS. I.N. Kuz'min, I.G. Kamenshchikov and M.P. Ovchinnikova. Asbestos for the production of filters is boiled for 1 hour in a 0.2-0.25$ solution of HCl (151. per 1 kg of asbestos), then washed with cold water and fiberized in an oq_uecus suspension (contng. 0.5 - 1$ of asbestos) in a vertical paddle stirrer (900-1000 r.p.m., 40-50 mins.). 521 MEASUREMENTS OF THE PRESSURES APPLIED DURING THE PRODUCTION OF ASBESTOSROLLERS. N.A.' Shirokov. Stekloj Keramika, 1961, 18, No.4. 38-39. The pressure applied during the production of asbestos rollers used*for the vertical drawing of glass should be carefully con trolled, otherwise the rollers cannot be properly machined, or if the pressure is too high, their axes may be bent. An appar atus for the measurement of pressures applied is described in detail. ASARCO ALV 0006557 129 ASBESTOS BULLETIN PART 11. REVIEW OF JOURNALS ASBESTOS - July, 1961. 807, Western Saving Fund Bldg., Philadelphia 7, Pa., U.S.A. 522. ASBESTOS-CEMENT PRODUCTS IN THE CONSTRUCTIONAL FIELD. W.E.Sinc V/.E. Sinclair, pp.2-10. The performance of asbestos-cement roofing in tropical conditions is discussed. 523. CANADIAN J-M TO USE SKIPS IN OPEN-PIT LINING, p.12. 524. B-E'-H DUCT INSULATION p.14. 3aldwin - Ehret - Hill Inc.'s improved spun mineral fibre duct insulation is described. i* 525. EAY3EST0S REVEALS FINDINGS 0? 3RAKE TEST RUN, p.16. ! * i This report indicates that T.he prelected life of the stock sets of Raybestos proving ground tested brake lining used, i averaged more than 42.500 miles. 526. CAPE INSULATION EXHIBITED. New C posil ET moulded slabs and Aluminium Foil Faced Asbestos Cloth have been developed by The Cape asbestos Co.Ltd. 527 IMPORTS & EXPORTS AC-23 INTERNATIONAL ASBESTOS-CEMENT REVIEW Editions Girsberger, Zurich, Switzerland. This number contains numerous illustrated articles on Schools. 528. Seily Oak Boys Secondary Modern School, Birmingham. 529. Hccksrill -J.M.I. School, Bishopstortford, Herts. 530. Waltheof Secondary Modem School, Sheffield. 531. University Extension Buildings, Auckland, New Zealand. 532. Asbestps-cemeni partition walls. 533. A school in Lagos. 534. Prefabricated schools in Belgium. 535. An Italian proposal for a prefabricated school, 536. Secondary School in the Pestalozzi Children's Village. 537. Prefabricated school near Geneva. 538. School in Kauklahti, Finland. 539. Mount L^wley High School, Western Australia. 540. New buildings for the National Polytechnical Institute, Nexico City. 541. Voldparkens School in Copenhagen. 542. French Prefab Schools. Jk. ASARCO ALV 000655S