Document mBa3veQagLrnzrNK2nQ19Z1Vb

.... - ^ --i-- -1 - PLAINTIFF'S EXHIBIT ASBESTOS BULLETIN Vol. 9 No. 5 September - October, 1968. Editor: C. Z. Carr-._l-Forczynski CONTENTS race Fart 1. ASBESTOS MINING.............................................................................. 105 Fart 2. ASBESTOS CEMENT...............................................................................109 Part 3. ASBESTOS TEXTILES.......................................................................... 118 Fart 4. ASBESTOS FRICTION MATERIALS.................................................... 118 Fart 5. ASBESTOS REINFORCES PLASTICS .......................................... 119 Part 6. BUILDING MATERIALS......................................................................120 Fart 7. ASBESTOS PACKING,SEALING & COATINGCOMPOSITIONS. 120 Fart 8. ASBESTOS PAPER & INSULATING MATERIALS..............................121 Fart 9- REFRACTORY FI3RES..........................................................................122 Part 10. MISCELLANEOUS............................................................................. 12 3 Part 11. REVIEW OF JOURNALS..................................................................... 124 (C) Copyright Astex Publishing Co., 1968. ---- ----------------- t- '....'iii-'"1----- I ASARCO ALV 0006583 asbestos bulletin 105 PART 1. ASBESTOS MINING. CANADA. 426 ASBESTOS. Canadian Mining Journal, February 1968, p.150. A. A. Winer. Shipments of Canadian asbestos during 1967 were reduced compared to those in 1966; production was 1.4 million tons of fibre valued at 0163 million. The decrease was probably due to lessening construct ion activity, which affected the demand for short fibre to a small extent although demand for all other grades remained uniformly good. World asbestos production for 1967 has been estimated at 4.3 million tons with Russia's output exceeding slightly that of Canada. The large increase in world production -.vill not hinder Canada's growth as a major chrysotile asbestos producer. Russian exports of fibre are not expected to increase in the immediate future due to her domestic needs. Large overseas sales of Canadian fibre, particul arly to the developing countries are expected to continue and perhaps increase, since asbestos products are highly resistant to humidity and temperature extremes and are especially useful in housing, con struction, and industrial applications. Market growth rates fcr the next five years have been estimated recently for the free world markets - the established markets will increase by 5 per cent, the U.S.A. by about 2 per cent and the overseas market by about 7 per cent. Proposals for development of the Canadian North were made in 1967, and the Federal and Territorial Governments commissioned an economic study of the Yukon. Asbestos has been an important factor in northern development for a number of years. Cassiar Asbestos Corp oration began operation of its mine at Clinton Creek, Yukon Terr, late in 1967 and fibre valued at over 00.5 million has been shipped. Exploration of asbestos properties in the region is being undertaken by other groups. Additional asbestos developments in Northern Canada include the Cassiar plant at Cassiar, B.C., and the asbestos property operated by Advocate Mines Limited at Baie Verte, Newfound land. Although the Asbes'cos Hill development in the Ungava area of Northern Quebec was suspended by the Asbestos Corporation pending a reappraisal of the operation, over 013 million had been spent up to that time. In British Columbia, plans for establishing an asbestos-cement manufacturing plant as soon as markets warrant, were announced by Bell Asbestos Mines Limited. The plant will be situated 15 miles south of Vancouver. In Ontario, Daniel Mining Company has drilled its property 36 miles south of Timmins in Semple Township. Hedman Mines Limited,presently 'I ASARCO ALV 0006589 106 ASBESTOS BULLETIN the only asbestos producer in Ontario, has received additional work ing capital to develop its Matheson property. The plant is expected to be operative in 1968 In the Chibougamau district of Quebec, the MeAdan Mining Corporation Limited is planning an underground development programme to assess fibre grade. The Quebec Asbestos Mining Association, embracing the majority of the Canadian Asbestos producers, participated in Expo '67 by sponsoring a 4000 square foot plaza. Asbestos products of all types were used widely in many of the Expo '67 buildings and structures. Research is necessary to provide additional new use3 for asbestos fibres. It is therefore of interest that chrysotile asbestos fibres have a tensile strength much greater than such other fibres as glass, silica, nylon and rayon; at least twice that of glass and eight times that of nylon. A breakthrough in the bulk handling of fibre is a possibility through the use of hopper rail cars. These cars of 50 ton capacity, specially fabricated by Procor Ltd. of Oakville, Ontario, are being tested. Pressure packing of up to 100 pounds of fibre in bags is another important handling technique under test. Asbestos Production (Shipments) 1966? Short Tons 0 1967" Short Tons Newfoundland Quebec Ontario British Columbia Yukon 57,097 1,341,491 1,696 88,771 - 9,301,204 138,570,399 64,519 15,718,741 - 63,000 1,260,468 1,600 72,640 3,000 10,234,000 138,828,849 70,400 13,365,000 513,000 1,489,055 163,654.853 1,400,708 163,011,249' F - Final P - Prel. Source: Dominion Bureau of Statistics. W 'l ASARCO ALV 0006590  asbestos BULLETIN 427 HUDSON STRAIT ASB! o.*p 107 Canadian Min. J. May,1968, p.15. No farther evaluation has been carried out on Asbestos Hill orebody and accordingly the estimate of .vooorves at that property has not been changed; but 18,738,000 tore can be considered as a minimum. The project has been on a care and maintenance basis pending the study of various means of bringing the property into production. Expenditures on the project during 1967 amounted to $'1,770,000. In 1968 costs are expected to be only a small portion of this amount. if Ji 428 ADVOCATE MINES LIMITED. Asbestos, May 1968, p.40. , Net income of Advocate Mines Limited for the year 1967 was #1,865s561 $ compared with $'2,506,726 in 1966. The decrease in earnings was due mainly ~o higher mining costs, which resulted from a 23^> increase in the mens of material mined. Net additions to plant and equipment amounted to $613,463. i As a result of further drilling, ore reserves at December 31 'were 67.000.000 tons. This represents a satisfactory improvement in the ore position as the reserves reported at the end of I966 were 55.000.000 tons and about 1.9 million tons of ore were mined in 1967. , i The value of fibre produced was $10,940,799 in 1967 against $10,803,762 ' in 1966. ' 429 ASBESTOS CORPORATION LIMITED. Asbestos, May 1968, p.40. j 1r i Net income for Asbestos Corporation Limited and its subsidiary ,| companies for the year 1967 was $4,120,159 compared with the previous '< year when- it stood at $5,135,055* Sales in 1967 reached $39,235,457 i against $39,166,628 in 1966. Inventories were valued at $4,450,238 A for stock of asbestos on hand and at $2,329,038 for materials and ; \( . supplies, at cost. v i All mines operated at or near capacity and the value of overall f ij - asbestos production increased by about 5? The average daily tonn- ' j age of ore processed for all mines was 27,008. Ore reserves were j - i =- calculated at year end as 161,163,000 tons. (King-Beaver Mine - 45,942,000; British-Canadian Mine 70,460,000, Normandie Mine , 11.550.000, Asbestos Hill 18,738,000. Other Properties 14,473,000.) [ The Asbestos Hill Project has been on a care and maintenance basis 3 ^ pending the study of various means of bringing the property into production. Expenditures on the project during 167 amounted to $1,770,000. [ ASARCO ALV 0006591 108 ASEE3T0S BULLETIN 430 CASSIm ASBESTOS CCRrOBo'inN LIMITED. Asbestos, May 1968, p.42. Net profit for the year 1967 for Cassiar Asbestos Corporation Limited amounted to ^4,175185 as compared to ^4,145>766 earned in 1966. Demand for all grades of asbestos fibre was good throughout the year and revenue from the sale of fibre totalled s20,845403. A general exploration programme was carried out in Northern British Columbia and. the Yukon but no showings of economic interest were found. U.S.S.R. 431 DEMANTOID FINDS IN ASBESTOS VEINS OF THE DARINSKII DEPOSIT (NORTH ARMENIA) N. S. Korchagina and K. A. Parsamyan. Zap. Arm. otd. Vses. mineralog. o-va, i960, No.3> 114-118; Ref. Zhur. Geol. 1967, 7V204. Bhombohedral crystals of demantoid (modification of andradite garnet) were found in chrysotile asbestos veins. The demantoid crystals were enveloped in asbestos fibre sheathes. Apparently, they were formed prior to asbestos, as a-result of the action of acidic hydrothermal solutions on ultrabasic rocks. 432 THE MECHANISM OP THE FORMATION OF ANTOPHYLLITE ASBESTOS. V. V. Bairakov and A. Yu. Khmara, Doklady Akaa.Nauk SS5R, . 1967, 174, No.1, 185-188. Itinera logical evidence is presented in support of the theory that antophyllite asbestos is formed by chemical transformation and cleav age of non-fibrous antophyllite. Chemical changes comprise a partial removal of iron and magnesium catrons and increase in bound water content. Chemical analyses of specimens of antophyllite asbestos and non-fibrous asbestos are given and their optical properties are compared. 433 FOREIGN TRADE OF U.S.S.R. IN 1967 Exports from the Soviet Union in 1967 included 2855200 tons of asbes tos (256,800 tons in 1966). Treatment of Asbestos Fibres. 434 NETHERLANDS APPLICATION 6,602,625- COLLOIDAL MECROCRYST,TT^ INE ASBESTOS FIBRES. EMC Corp. Chrysotile asbestos is treated with a warm dilute acid or acetyl: mixture (to reduce the SiO?*- MgO ratio) and then mechanically g: A hydrophilic solvent is added and the resulting opaque white ge! formed into a thin foil for use in laminates. ASARCO ALV 0006592 asbestos bulletin 109 435 GERMAN PATENT 1,235,871 nod 1,226,505- PRODUCTION OP PINE ASBESTOS FIBRES. Badische Anilin- & Soda-Fabrik. Pine asbestos fibres are obtained by opening bundles of chrysotile asbestos fibres dispersed in a liquid hydrocarbon medium in the presence of wetting agents soluble in hydrocarbons. In an example, 33O parts of Canadian chrysotile asbestos were agitated for two days in 3000 parts of light petrol containing 30 parts of oleic acid. Asbestos fibres of a diameter of 200 - 500 Amstrong were readily separated from the slurry obtained. 436 ENRICHMENT OF ASBESTOS ORES. P. V. Levchenko et al. Tr. Uralskogo Politekhn. In-ta, 1966, 3b.150, 149-151? Ref.Zhur.Khim., 1967, 8M269- Laboratory experiments have shown that by using an air counter-flow column classifier with overflow shelves, highly effective enrichment of asbestos ores can be attained reaching at some stages 92%. Opti mum conditions of the process have been determined. 437 U.S. PATENT 3,346,111. RENDERING ASBESTOS ORE PARTICLES DIFFERENTIALLY FLUORESCENT. The Colonial Sugar Refining Co. The principle of electro-pneumatic sorting has teen applied to the sorting of falling objects, e.g. rocks according to their reflectiv- iiy'characteristic. Yfnen asbestos-containing rock is dipped in fluorescent dye, it is foued that the exposed seams of asbestos can be identified by the relative brilliance of their fluorescence. 438 SOLUBILITY OF THE CONSTITUENTS OF SERPENTINITE. G.I.Loggir.ov and E. M. Ioffe. Sb.i.'r. Eosk.inoh-stroit.in-t. , 1965,No. 50, 64-69; Ref.Zhur.Ehim., 19&6, 13M262. The solubility of the constituents of waste materials of the asbestos industry in 4.7 - 14f HC1 at temperatures of 20 - 100C has been studied with recirculation of the reagent, autoclave treatment and application of ultrasonic vibrations. Data are given relating to the dissolution process, especially in relation to the dissolution of MgO. The problem of the recovery of HCl.from the MgCl2 solutions obtained has been examined. PART 2. ASBESTOS CEMENT. 439 BRITISH PATENT 1,112,223- IMPROVEMENT'.' IN THE MANUFACTURE OF ASBESTOS-CEMENT PRODUCTS. Philip Carey Mfg. Co.(1966) Ohio, U.S.A. ASARCO ALV 0006593 ft i 110 ASBESTOS BULLETIN r !t 440 INSTALLATION OP SECOND VAT INCREASES BY 30$ THE PRODUCTIVITY ; OP ASBESTOS-CEMENT PIPE FORMING MACHINE. . \ J M. E. Chechenin i (Translation from Russian: Copyright Reserved). * i :i The asbestos-cement industry has vast experience in increasing 'J productivity of mesh cylinder machine by installing additional mesh j cylinder vats. Between 1957 and 1965 the number of sheet forming machines with two mesh cylinders decreased sharply and they were \ retained mainly only for the manufacture of special sheets "UV" \ reinforced corrugated and "ATSEID" asbestos-cement electro-insulated - boards. The number of more productive machines with three mesh ; cylinders during the same period doubled. There is also encouraging experience at "Krasnyi Stroitel", Pikalevsk and Sterlitamaksk com bines in operation of four cylinder machines. - Foreign experience shows that installation of an additional vat to a sheet forming machine also increases its productivity. Therefore machine building firms in a number of countries including "Voith" in Austria, "ROM" in Italy, "Wehrnahn" in West Germany are making pipe forming machines with two mesh cylinder vats. ` , f , ;'j SKB Asbotsemmach designed two cylinder machines SM-1040 and SM-1071 for the manufacture of 4 and 6 - metre long pipes, and the new asbestos-cement pipe factories will be equipped with these machines. At the same time, the existing process lines with one 1 cylinder pipe forming machine ought to be reconstructed. In order to show the feasibility of an increased productivity l of the existing pipe forming machines on the account of installation of second mesh cylinder vats, the Scientific-Research Institute for t Asbestos-Cement carried out laboratory and factory scale experiments as far back as in the year 1961. Samples of 100 mm diameter and i 50 cm long asbestos-cement pipes were made beforehand on a laborat Ll j ory machine, while working with one and two mesh cylinders arranged^ in two vats in consecutive order to the felt's movement. I The content of asbestos, grades 3 and 4, in the asbestos-cement mass was 13.7$. Its concentration and temperature were changed in I order to obtain films of various thicknesses. When working with I two mesh cylinders, the mass was supplied to the rear vat, and further overflowed by gravity over the partition into the second one. The laboratory machine was of imperfect construction as com- "V _ ti pared with a factory one; felt speed 14.2 m/min., pressure of the co1| 1 'I I ASARCO ALV 0006594 4S3SST0S BULLETIN 111 rolls at 2.3 kg/31 n.cm., and that of the compressing rolls 13-15 at the start and 10 - 12 kg/lin. cm. ; the end of the pipe's formation process. Because of this, the strength of all the experimental sample3 was low. It was ascertained that at high mass concentrat ions on a machine running with only the rear vat, it was possible to obtain maximum 0.33 mm thick films. The strength of the pipes was the lowest. When operating the machine with two vats, the total thickness of the layer obtained was 0.44 mm and the strength of the pipes proved to be relatively high (Table No.l). The results of the laboratory experiments was the basis for working out reconstruction projects for installation of a second mesh cylinder vat at 3-metre pipe forming machines. This was accom plished by PKB Asboshifer in three versions. According to the first, the second mesh cylinder var was installed between the exist ing vat and the machine's compressing part. To secure feeding and overflow of the asbestos-cement mass from the first into the second vat, the latter was sunk somewhat below the floor level and provided with an additional pump to return the surplus mass into the first vat or the scoop stirrer. Suspension of the couch rolls and the water detaining rollers is carried out in the usual way. Over the second vat on the machine's bed plate is mounted telpher for removal of the mesh cylinder when changing its mesh. In this variant the usual length of the felt and the machine's measurement remains un changed, and, owing to its continuous overflow and recirculation, there is no necessity for float arrangement to regulate the mass level in the vats. However, with such a construction the existing flow of backwaters is disturbed owing to the lowering of the second vat. The different vat levels cause undesirable pitch of the felt,and film forming on the second mesh cylinder is adversely affected. Also removing of the second mesh cylinder is more difficult. According to the other variant (Fig.l), the second mesh cylinder vat is also installed between the existing vat and the machine's compressing part, but on an even level. Feeding of the second vat with the mass takes place by overflow through an additional chute connecting adjacent walls of the vats. The level of the mass in both vats is equal. In order to lower the concentration of the mass, an additional clean water spray is installed at the overflow into the second vat. The second vat is mounted on wheels and it can be wheeled aside the machine, by this making it easier to change the cylinder. The existing apparatus ensures the required level of the mass in both vats. The measurements of the machine and the length of the felt do not change. With this variant the machine's deconstruction is more complicated. Installation of rails under the additional vat requires deepening of the machine's seating and to wheel the vat aside,there must be free space, also the chute ASARCO ALV 0006595 112 ASBESTOS BULLETIN connecting the vat must be easily dismantable. * According to the third variant (Fig.2), the additional mesh cylinder vat is installed between the existing vat and the scoop stirrer. The apparatus which regulates the feed of the machine with the mass must be replaced and connected to the additional vat. The asbestos-cement mass is overflowing from the additional vat into the existing one, which is on the same level. Both couch rolls are mounted on one extended felt's frame, but each of them has independ ent suspension with weight arrangements to regulate the pressure on the mesh cylinder. The pivoted fixing of the feltb frame to the machine's bed plate permits by means of a winch to raise it in a vertical position when changing the mesh cylinders. Instead of the water detaining rollers special suckers are installed on the felt's frame, which by means of a flexible hose are connected to a pump and remove the squeezed out water. The last variant is the least labour consuming as to alteration of pipe forming machine. At nearly all factories there is space (behind the machine) where additional vats can be installed. There will be no difficulty in making a 19-5m long felt for two vats in stead of a 16m long for one vat. In order to check the effectiveness as to introduction of an additional vat, at the Bryank combine was reconstructed a pipe forming machine ATM-3. As a base was taken PKB project's second variant, with the following alterations: the second vat was in stalled not on rails but on anchor bolts on an even level with the main vat; the winch, raising the felt's frame, was transferred nearer to the machine's compressing part, and the lever of the additional couch roll was directed to the same side as the lever of the main couch, roll. Two batches of VNL-8 100mm diameter pipes with different felt speeds were made; one at 31.7 and the other at 43.3.m/sec. It was ; difficult trying to avoid some process trouble during the experiment, namely, the water pressure in the spray pipes was insufficient, the conveyor of the pipes preliminary hardening was not equipped with rollers and the water temperature in the pipes hardening ponds was only 30 - 350- All this adversely affected the quality of the .* pipes. However, comparative data as to the pipes strength and productivity of the machine, when working with one and two vats, was r obtained. The control batches of the pipes in the main differed in the ha ASARCO ALV 0006596 iri ,i! ?ig. 1 Installation scheme' of the additional tat between, the existing vat and the compressing part. % Fig.2 Installation scheme of the additional vat between the existing vat and the scoop 3tirrer. H4 ri i} \` h ASARCO ALV 0006597 ASBESTOS BULIiETIN 115 In the latter case it took longer to get the machine to a steady running condition after the start or when changing the film's thick ness* It was inconvenient to watch the rinsing of the additional mesh cylinder and the bronze meshes owing to lower concentration of the asbestos-cement mass in the vats soon got blocked. A twofold increase of the machine's filtering area with a simultaneous lowering of the mass concentration led to a considerable increase of the back waters volume. As a result the -'.apacity of the 6 NE pump, installed to convey backwaters to the recuperators was insufficient, and the pit under the machine was already overfilled in 1.5 hours after starting to work with both cylinders. The control batches of the pipes were hardened under the factory's routine conditions - 9 hours on the roller conveyor and 48 hours in ponds with 30 - 35C water temperature. At a fortnight's age, they were subjected to hydraulic pressure and the walls density tests. They proved that the pipes made with both mesh cylinders in operation and from a film of high total thickness (0.34 - 0.37 mm) when sub jected to a hydraulic pressure test, had an average ultimate strength of 148 - 133 kg/cm2, but with one cylinder and maximum possible film thickness of 0.28 - 0.34 mm - only 100 - 75 kg/cm2. Productivity of the machine was calculated according to the chronometric timing data by using formula P = 4,?Q Z. 4.2 . 0.98 piece/' D shift, where p - complete formation cycle of one pipe in min. The calculations proved that by installation of a second vat the pro ductivity of pipe forming machine can be raised by 25 - 30$. The work carried out by the Scientific-Research Institute for Asbestos-Cement showed that installation of second mesh cylinder vats to the existing pipe forming machines will allow to increase their productivity in average by 30$ and at this the quality of the pipes will not worsen. The installation of second vats will require only insignificant alterations in the factory's preparatory departments, namely, to increase the asbestos-cement mass supply to the machines and the backwater pumps capacity. The projects for installation of second vats worked out by SKB Asbotsemmach must be elaborated while taking into account carried out experiments and the latest conclusions concerning the forming machines feeding assembly and with a view that, during the years 1968 - 1969 the second vats are made and installed in several factories. I "T ASARCO ALV 0006598 116 ASBESTOS BULLETIN TABLE 1. Asbestos-cement pipes of 100mm diameter formed on the laboratory machine With one vat With two vats Thickness of the asbestos-cement in mm. 0,12 0,18 0,22 0,30 0,33 0,19 0,34 0,44 Concentration of the mass in 5 5 8 10 10 5 6 8 Density of the pipe walls gr/cm' 1,84 1,58 1,62 1,65 1,58 1,70 1,70 1,57 Strength of the pipes: Bursting press ure in atm. 19 13 13 12 9 21 21 25 Ultimate tensile strength kg/cm2 96 81 73 68 55 101 93 104 441 ASBESTOS PRODUCTS IN Tnl BUILDING- INDUSTRY. G. E. Bonne ii. Methods of production of asbestos cement, and its refractoriness heat-insulating properties, sound absorption and durability are described. The*resistance of asbestos cement to attach by acidic atmosphere is discussed. Coefficients of thermal conductivity and sound absorption were determined for various types of asbestos cement, in relation to different structural elements made of asbestos cement. 442 FRENCH PATENT 1,524,317. DEFIBERISATION OF ASBESTOS. Centre de Recherches de Pont-a-Mousson. ':t Defiberisation of asbestos is carried out in an aqueous suspension in an apparatus comprising a graded hydrocyclone which separates fine fibres from fibre agglomerates. The fine fibres are withdrawn from the top part of the hydrocyclone, whereas the agglomerates are withdrawn from the bottom part, reground and recycled. 7 L. 'l ! ASARCO ALV 0006599 ASBESTOS bulletin 117 JAPANESE PATENT 11120/68. Pennsalt Chem. Corp. COATED ASBESTOS-CEMENT. Asbestos-Portland cement products are coated with an aqueous resinous dispersion containing a methyl methacrylate copolymer, sugar, titan ium dioxide, zinc oxide and chromium trioxide. 444 : RUSSIAN PATENT. MACHINE FOR SHAPING PROFILED WORK PIECES FROM FLAT FIBROUS CEMENT BLANKS. R. I. Lipkin and V. S. Osinov. A machine for shaping flat fibrous cement blanks comprises a suction1 box plunger co-operating with an elastic band placed underneath the plunger, being extended and supported by rolls which are mounted on , a frame. The position of the rolls on the frame can be changed de pending on the desired shape of the products. 445 ; RUSSIAN PATENT. MACHINE FOR TRIMMING STACKED ASBESTOS CEMENT SHEETS. Spets.konstr.byuro po oboruaovaniyu dlya proizv. asbestotsementnyky izdelii i rulonno-krovelnykh materialov. (M. S, Khiger et al.) / A machine for trimming stacks of asbestos cement sheets, or the like, comprises disc knives with carriages provided with reversible arms ; interacting with the stack, a clamping plate hydraulically driven and a rotatable base provided with hydraulic lifters and mobile trolleys. The stack can be easily trimmed on all sides. 446 BELGIAN PATENT 707,993. FI3ERISING CRUDE ASBESTOS. Centre de Recherches de Pont-a-Mousson. / A suspension containing asbestos fibre bundles is processed in a ;; hydrocyclone; Fine fibres are extracted from the upper part of the ' hydrocyclone, while the remaining agglomerates are withdrawn from . the bottom of the hydrocyclone and further treated in an edge-mill, i The cyclonic treatment is carried out with water under a pressure of several atmospheres. 447 GERMAN PATENT 1,269,558. MATERIALS PROTECTING AGAINST j DAMAGING RADIATION. F. Marxen and R. E. Vogel. j f" Materials used for protection against gamma rays and neutrons, such- as concrete, magnesia cement, asbestos-cement etc., accoding to t l German Patent 1,230,342, contains 2.5 - 35?" of compounds of stearic \ | acid and/or saturated fatty acids with zirconium, lithium or barium. i' ii - ! < ! 1{ ;i ASARCO ALV 0006600 118 ASBESTOS BULLETIN PART 3. ASBESTOS TEXTILES, 448 CANADIAN PATENT 737,275. FLEXIBLE NON-RESONANT MATERIAL. H. K. Porter Co. A fabric containing preferably about 83f by weight of asbestos fibres and the remainder cotton or other fibres is coated on at least one of its surfaces with a natural or synthetic rubber or latex film containing finely divided discrete particles of a very dense solid material. The particles are so dispersed as to be essentially entirely dissociated from one another. Lead pellets are preferred. The rubber or latex material may contain a flame proofing agent, such as a chlorinated paraffin, and a solid pigment, The limpness of the material makes it essentially non-resonant. U9 FRENCH PATENT 1,521,719. ASBESTOS FIBRE CORDS. Rex Asbestwerke Graf von Rex KC-. Asbestos cords are manufactured by preparing a dispersion of short asbestos fibres, forming it into a band while .coagulating it by means of a precipitant, and then twisting the band to form a cord. 450 JAPANESE PATENT 9908/68. HEAT-RESISTANT PACKING MATERIALS. Kurosaki Yogyo Co. Packing materials for e.g. ingot moulds or metallurgical plants are produced by preparing a mixture of aluminium, bauxite, or similar materials, adding water and an organic or inorganic binder, e.g. clay, and optionally graphite, kneading the mixture, burying in it cords of asbestos fibres, and forming the materials into elongated bodies. FART 4. ASBESTOS FRICTION MATERIALS. 451 CANADIAN PATENT 737,548. FRICTION COMPOSITION. Chrysler Corp. A composition suitable for lining clutches, brakes and the like, consists of about 77 parts by weight of Grade 5K asbestos fibres, 20 parts of toluene as a solvent, 14 parts of a low-viscosity sol uble butadiene-styrene polymer in crumb form, 3.8 parts of zinc oxide, 3 parts of organic friction particles such as "NC-lll", 2.3 parts of coke particles, and 2 parts of water. The butadiene-styrene poly mer is cured by oxidation. The composition has a good friction stability and fade resistance. 'l ASARCO ALV 0006601 IM IW fm M w ii-M n i ................................................. .. ..........-------------- ---------------------- -------- ^ ^ d h ^ - e asbestos bulletin 119 452 JAPANESE PATENT 12676/68. PRODUCTION OF BRAKE OR CLUTCH LINING. Alebono Brake Industries Co. Corrosion of metallic parts in contact with brake or clutch lining is prevented by first impregnating asbestos fibres with an aqueous or * methanolic solution of sodium nitrile or sodium benzoate, then drying and bonding with a resin. PART 5. A-SBESTOS REINPORCED PLASTICS. 453 NETHERLANDS APPLICATION 6,717,219. RESINOUS BONDING COMPOSITION. V/. R. Grace & Co. An improved bonding composition for various substrates comprises: (1) a liquid resin, such as an epoxy, phenolic, polyurethane, poly- sulphide, polyester, polyamide or polyimino resin; (2) a curing agent for the resin; and (3) a mixture of (a) 5-55/ by wt. of chrysotile asbestos fibres(diameter max._25 microns, length 200 - 500 microns) or polyoxymethylene fibres) and (b) 50-957 by wt. of a fill er, such as kaolin, Giatonaceous earth, Portland cement, or oxides or hydroxides of Si, Al, Ti, Pe or 2n. 454 NETHERLANDS APPLICATION 6,717,283. MOULDED PLASTIC PANELS. I.C.I. Ltd. Strong, corrosion-resistant, light-weight panels, suitable for use, e.g. in cars or caravans, consist of a foamed plastic material, such as polypropylene, polyamides, polycarbonates, acrylonitrile/butadiene7 styrene copolymers, polyacetals, polyphenyl ethers or polysulphones, optionally reinforced with asbestos or glass fibres. ; 455 FRENCH PATENT 1,512,974. MOULDING COMPOSITIONS, Badische : Aniline- & Soda-Fabrik. il A moulding material consists of (a) bitumen (b) copolymers of ethyl- j : ene and vinyl esters and/or acrylic or methacrylic compounds (c) poly- -j i isobutylene and (d) oily butadiene polymers and/or high molecular % weight aliphatic polysulphides, and/or fillers. Suitable fillers i) include glass fibres, asbestos, rockwool, wool fleece, jute etc. j 456 FRENCH PATENT 1,521,166. SANDWICH LAMINATES. V7. R. Grace & Co. \ Laminates comprise a polystyrene foam layer interposed between two [ sheets, at least one of which is made of thermoplastic resin contain- j ing a fibrous reinforcement such as asbestos, glass, organic fibres, j] % asbestos-glass fibre blend or a mixture of asbestos fibres with i ; f- cellulosic fibres. e JL ASARCO ALV 0006602 r*ft: 120 ASBESTOS BULLETIN PART 6. BUILDING MATERIALS. 457 CANADIAN PATENT 736,909. FIBRE-REINFORCED PLASTIC PIPES. Johns-Manville Corp. A high-bulk asbestos paper is impregnated with 35-657 by wt. of a thermosetting resin, the paper is heated to partially cure the resin and remove most of the volatile substances, and the paper is formed into pipes (or other shapes). The pipes are completely covered with a neoprene rubber sleeve or other flexible member, and then subjected to fluid autoclaving to finally cure the resin. The sleeve is then removed from the cured shape. 458 NETHERLANDS APPLICATION 6,715,986. MORTAR COMPOSITION. 3auunternehmung Fritz Bender. A mortar, particularly suitable for laying blocks of porous concrete or sand lime bricks, is composed of (1) washed sand (max.1mm);(2) a hygroscopic powdered material (pref.unslaked lime, Munster lime hydrate, etc.); (3) Portland cement; (4) buff stone powder; and (5) an adhesive (pref.raethyIcellulose, optically with addition of asbestos powder). The mortar can be applied in thin layers, and the joints have good characteristics and durability. 459 JAPANESE PATENT 2779/68. RUST-INHIBITING PAINT. Mitsubishi Heavy Ind.Ltd. A rust-inhibiting paint for welded joints consists of (1) one or more of urethane or alkyl-type resin; coal tar and asphalt; (2) a mineral substance, such as limestone, fluorospar, crysolite, clay or asbestos; (3) a deoxidiser such as ferro-silicone or ferromanganese; and (4) a hardening accelerator. 460 GERMAN PATENT 1,268,812. METAL CHIMNEY STACK. H. Ruck. A metal chimney stack is protected against corrosion by inner and outer coating of a glass fibre-reinforced resin composition contain ing heat-resistant fillers such as asbestos fibres. PART 7. ASBESTOS PACKING,SEALING & COATING COMPOSITIONS. 461 FRENCH PATENT 1,515,542. SEALING MASTICS. W.R.Grace & Co. Sealing mastics are composed of a butyl rubber, a solvent and,option ally, a drying oil (e.g. linseed oil) and a filler. Suitable filled are calcium carbonate, talc and asbestos. The product is improved ' by the addition of a polybutene containing oil gelled with a metal salt of a fatty acid, preferably aluminium stearate. ASARCO ALV 0006603 ASBESTOS BULLETIN j. 462 NETHERLANDS APPLICATION 6,614,021. MANUFACTURE OF ASBESTOS PRODUCTS. Turner Bros.Asbestos Co. Asbestos products are prepared electrophoretically by passing an anionic aqueous dispersion of asbestos fibres, optionally with other components, between two electrodes in order to effect displacement of the solid components towards the anode where they are deposited and continuously withdrawn from the apparatus. Alternatively, a porous membrane may be placed in the path of the electrophoretic movements of the solid components which are deposited on it and with drawn. Asbestos sheets and coated products, e.g. packings of asbestos coated with styrene-butadiene rubber of polytetrafluoroethylene, may be produced by this method. 463 RUSSIAN PATENT. REFRACTORY LUTING FOR INDUCTION FURNACES. N. I. Grafas et al. A refractory living material contains, as a filler, calcined serpentinite from wastes of the asbestos industry. The use of the serpentinite filler allows to dispense with of the expensive I^SiFg and prolongs the service life of the lining. The composition consists of (in $): coarse serpentinite filler 25-35, medium serpentinite filler 20-30, finely ground serpentinite 15-25, water glass 12-20, finely ground magnesite 5-15. 464 CANADIAN PATENT 743,852. LATEX-BONDED ASBESTOS SHEET MATERIAL. Dominion Rubber Co. Sheets are produced by mixing with water about equal parts of asbestos fibres and cellulose fibres; adding a latex comprising 70-9770 by wt. of a butadiene-styrene copolymer or butadiene-acrylon itrile copolymer and 3-30$ of a carboxylated rubber polymer; dewater ing the mixture; and forming into sheets using conventional equip ment . FART 8. ASBESTOS PAPER & INSULATING MATERIA15. 465 CANADIAN PATENT 737,432. ASBESTOS-POLYESTER LAMINATES. Johns-Manvilie Corp. High-bulk asbestos paper is float-saturated with catalysed isophthalic polyester modified with a diallyl phthalate monomer and dissolved in an organic solvent. The paper is cured to the B-stage, then plied and press-laminated. The resulting laminate is post-cured at about 325F. The laminate is particularly suitable for motor and switch gear insulations, as it has good physical and electrical properties at high humidity and high temperature conditions. ASARCO ALV 0006604 122 AS3SST03 BULLETIN jlSB 466 FRENCH PATENT 1,523,465. ASBESTOS PAPER OR CARDBOARD. S. A. Franchise du Ferodo. Paper or cardboard is manufactured from a mixture of asbestos fibres and a binder containing an alkali metal silicate and an alkali metal aluminate in a suitable ratio. 467 NETHERLANDS APPLICATION 6,614,464. INSULATING MATERIAL. Grefco Inc. Insulating material containing a light weight inorganic aggregate (e.g. expanded perlite) and a fibrous material (preferably newsprint, but other fibres may also be used including asbestos) is produced by first mixing the inorganic aggregate with the fibres in a gaseous medium under dynamic conditions, then admixing an aqueous componentcontaining a binder, separating the mixture from the gaseous medium, separating nearly all the water, shaping the resulting material under pressure and drying. 468' BELGIAN PATENT 707,539. THERMAL BARRIER. Soc.pour 1'Industrie Atomique, S.A. FAR' 471 Hea As con 250 nix par 472 The ann mat sul 473 Hot and cold compartments of e.g. a heat-exchanger, are separated by means of porous barriers having a low permeability. A suitable barrier may consist of a laminate comprising sheets of inorganic webs, such as glass fibres or asbestos fibres, and metallic sheets, such as stainless steel. PART 9. REFRACTORY FIBRES. 469 NETHERLANDS APPLICATION 6,617,544 & BELGIAN PATENT 707,877. GROWING SILICON CARBIDE WHISKERS. Silicon carbide whiskers are grown by the gas-liquid-solid method. A gas phase containing components of silicon and carbon at a temperature 1200-1400C is in contact with molten iron which is distributed in a finely divided form on a solid substrate. The whiskers grow on the-., solid substrate,and are then separated. They are particularly useful as filter material,and as reinforcement for plastics,glass or metal, or for use in semiconductors. 470 INVESTIGATION OF THE GROWTH OF TIN WHISKERS. A.Politycki & H.P.Kehrer. Zeitschrift fur Metallkunde,1968,59,No.4,309-313* The incubation period of tin whiskers is reduced to a Tew hours and V the initial growth rate increased to 500 A/hr.,if a 0.5-1 micron tip coating is deposited on a copper sheet(deformed by 30$)and the electr olyte is heated to 40C. The addition of organic brighteners to the electrolyte is very advantageous. An com as tit 474 Aro hal ato Coe acc 475 Lub spr an the tai sil 'l 1 ASARCO ALV 0006605 BULLETIN 123 rjprp ip. MISCELLANEOUS IMPROVED METHOD OP PRODUCING HEAT-RESISTANT ADHESIVES. P. A. Dranniskova and G. I. Shekhterman. Heat-resistant adhesives are now widely applied in various fields. i simple and rapid method of the production of organosilicon adhesives containing asbestos fibres comprises calcining the asbestos fibres at 250C, activating their surfaces by milling in a vibratory mill and tdxing them with the other components in a vibratory mixer. The .parameters of the process are given. 472 GERMAN PATENT 1,224,449. INGOT MOULD WITH OPTIONALLY HEATED HEAD. Ver. Osterreichische Eisen - und Stahlwerke. i fhe joint between ingot mould and its head is surrounded by an annular heat-insulating body or, alternatively, a heat-insulating -Si naterial sulating is housed materials in a recess in the joint member. are asbestos or slagwool. Suitable in 473 <5 GERMAN PATENT 1,240,150. ION EXCHANGE MEMBRANE ELECTROLYTE POR A FUEL CELL. S.E.R.A.I. An electrolyte body for a fuel cell for hydrogen or methanol fuel comprises a membrane consisting of an inert carrier material, such as asbestos, impregnated with a phosphate of tetravalent tin or titanium. 474 FRENCH PATENT 88,236 (ADDN. TO 1,424,877) AROMATIC POLYMER COMPOSITIONS. Monsanto Chem.Ltd. Aromatic polymers are prepared by heating an aromatic sulphonyl balicb with an aromatic silicon compound having replaceable hydrogen atoms. During the heating sulphur trioxide groups are liberated. Composition containing asbestos fibres impregnated with the polymer Recording to the invention have high strength at elevated temperatures 475 FRENCH PATENT 1,515,184. DRAWING OP METALS. Soc. d'Exploitation des Brevets C.S.L. & lubrication during the drawing of metals is carried out either by spraying a lubricating substance or by inserting a tube composed of -M a material having lubricating and heat-insulating properties between |be billet and the walls of the draw plate. The composition may con *:.V$ tain asbestos, kieselguhr or mineral wool, with a binder, such as a silicate or a natural or synthetic resin. ASARCO ALV 0006606 124 ASBESTOS BULLETIN PART 11. REVIEW OF JOURNALS "ASBESTOS", March 1968. 131 North York Road, VLllow Grove, Pern.19090,U.S.A. 476 EDITH E. COX RETIEES, D. 2. 477 SCRAP RECOVERY IN 3T0S CEMENT PRODUCT PLANTS, 478 NOHAMITE IJ ` -- . .. - :i ^ JJ LAAINATES, c. 10. 479 Q.A.K.A. vlt ;-\y: ASBESTOS TEAM, d.12. 480 BUI USING, p< 30. 481 MARKET CO NIL LIONS, p. 36. 482 IMPORTS t: rXrORTS, p.4 0. 483 UPAS, c.4 6. 484 ASBESTOS PRICES' d . 5-*r. 485 ASBESTOS PATENTS,' p. 56 "ASBESTOS", April 1968. 486 NOTE FROM THE PUBLISHER, o.l. 487 ASBESTOS TEXTILE ELECTRICAL INSULATIONS, o.6. 488 MARKET CONDITIONS, p.24. 489 BUILDING, c.34. 490 PRODUCTION, d.38. 491 IMPORTS & EXPORTS. o.40. 492 INDUSTRY NEWS, c.46. 493 NOTES FROM IQ67 ANNUAL REPORT'S, d.50. 494 ASBESTOS PRICES, 0.58. 495 ASBESTOS PATENTS, p.60. "ASBESTOS", May 1968. 496 ASBESTOS TEXTILE ELECTRICAL INSULATIONS, o.2. 497 MISS EDITH E. COX RECEIVES ASBESTOS STORY RING, D.10. 498 MARKET CONDITIONS, d.12. 499 BUILDING, p.16. 500 IMPORTS & EXPORTS, p.22. 501 PRODUCTION, p.28. 502 INDUSTRY NEWS, d.32. 503 ASBESTOS PRICES, p.46. 504 ASBESTOS PATENTS, p.50. H ASARCO ALV 0006607