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PLAINTIFF'S EXHIBIT VO VO CO S3EST0S BULLETIN Vo 1.7 No. 3 -fey - June, 1966. Editor; C. 3. Carrcll-Forczyrski Part Fart Part Pa rt ParT 1. 2. 3. 5. Part n( * Fart Part O^ Part "-ii-Vn-/ Part 11. asbestos hieing. . ASBESTOS CERENT. . ASBESTOS TEXTILES. ASBESTOS FRICTION MATERIALS. ASBESTOS REINFORCE!) PLASTIC; BUILDING ASBESTOS PACKING. CO. ASBESTOS PAPER & IN REFRACTORY FIBRES. Ill S CELT A1TE0US. . . (C) Copyright Aston Publishing Co., 1566. 76 77 02 35 37 88 I:: ASARCO ALV 0006360 asbestos bulletin 63 PART 1. ASBESTOS MINING. CANADA. 236. ASBESTOS. H. M. Woodroofe. Canadian Mining Journal, Feb. 1966, p. 148-9. In 1365 output from the Canadian industry declined almost 3 percent to 1,380,210 tons. Asbestos Corporation Limited is proceeding with the development of a large asbestos deposit at Asbestos Kill, 40 miles south of Deception Bay in Ungava. It is expected that this property will be brought into production in 1970 with a capacity of ICO,000 tons of fibre per annum. Yukon Territory may soon join the ranks of asbestos producers. Cassiar Asbestos Corporation is preparing the Clinton Creek deposit for operation in 1968. It is located 40 miles northwest of Dawson City and is expected to produce 40,CGC tons of fibre per annum. Bell Asbestos Mines Ltd., James Hardie Asbestos Ltd. of Australia and Eaybestos Manhattan Inc. are assisting in the financing of the development. Fibre from this deposit has characteristics desired by the asbestos cement industry. Ore reserves are estimated in excess of 12 million tons. The Munro Mine near Matheson, Ontario, operated for several years by Canadian Johns-Manville Company Ltd. closed down in mia-1964. A new deposit in Reeves township, <-C miles southwest of Timmins is under development. CJU has in hand an underground exploration programme to prove up this interesting deposit. The only product ion of asbestos recorded in Ontario in 1965 was from Hedman Mines Limited east of Matheson. Over the past, few years there has been considerable interest in the addition of short fibre-asbestos to asphalt road-paving mixtures. It has been reported that such additions reduce cracking of the road surface and lengthen the pavement life. Almost 3,000 tons of asbestos were used in this way. Recent research has indicated that asbestos has interesting possi bilities in the paper industry. A project at the University of Florida has indicated temperature resistant paper can be made from a mixture of asbestos and other inorganic fibres. Union Carbide Corporation has developed a special grade of asbestos from its California operation that is reported to be an effective addition to cellulose sulphite pulp in conventional paper making. Because of its electropositive surface change retention of asbestos in the ' *i? ASARCO ALV 0006361 Ot ASBESTOS BULLETIN paper furnish is higher than with other additives. The high surface area and ability to absorb organic compounds improved the dye absorp tion and printability of the finished paper, 237 PAPERS TO BE PRESENTED AT THE 68TH A.G.M. OF THE CANADIAN INSTITUTE OF MINING & METALLURGY - CHATEAU FRONTENAC HOTEL, QUEBEC CITY, APRIL 25-27, 1966. The Canadian Mining & Metallurgy Bulletin of March 1966,Montreal,p.273) 274. Industrial Minerals Division- The Evolution of Open-Pit Drilling and Blasting Practices at the Normandie Mine of Asbestos Corporation Ltd. by J.E.McMenamin - Asbestos Corporation Ltd. 2 38 A New A. p proa oh to Overburden Stripping, by R. E. Evans, Henry J. Kaisey Company (Canada) Ltd. 239 Chrysotile Asbestos. Relationship of the Surface and Thermal Properties to the Crystal Structure, by Edward Martinez, American Smelting & Refining Co. Due to its unique properties, chrysotile asbestos is used in many diversified applications. The relationship of some of the surface and thermal properties to the chrysotile crystal structure is dis cussed. In recent years methods have been developed for modifying the surface properties to improve the performance of asbestos in some applications. Examples taken from the literature are cited,includ ing the effect of pH on the positive zeta potential and the addition of sodiunsilicate to improve the filtration characteristics of asb estos. The dehydroxylation and formation of fosterite as chrysotile is heated are also discussed. 240 Dirt Stripping operations at Canadian -Johns-Manville by J. N. Gauthier, Canadian Johns-Manville Co.ltd. 241 Metal'Mining Division - Aerial Survey of Open Pits at Lake Asbestos of Quebec Ltd. by M. Lauzon,Lake Asbestos of Quebec Ltd. Aerial surveys of the open pits have been conducted regularly at Lake Asbestos of Quebec Ltd.,since 1958. Ground controls are supplied by Lake Asbestos and a topographic map of the pits at a scale of 1 in. to 50 ft. with 2-foot contour intervals, is obtained by aerial photo graphy. The information from the topographic map is then trans ferred by the Lake Asbestos engineering staff to sections from which the volumes removed are calculated. Considering the size and com plexity of the operation this system had proved to be the cheapest, fastest and most accurate way of determining the quantities of rock and overburden removed. 1 ASARCO ALV 0006362 4 ASBESTOS BULLETIN AFRICA. i ; 242 i` GRIQUALAND. NEW ASBESTOS INTERESTS. April 22, 1966, p.296. Mining Journal 65 i The South African Asbestos mining company, Griqualand Exploration, i is proposing to increase its capital by an additional 50,0CG shares which are to be issued to the Hans Merensky Investment and Trust at Ell each. The object is to enable Griqualand to take over the controlling interest in Elcor Investments, now held by Hans Merensky and thus obtain control of further substantial blue asbestos inter ests in the Kuruman district of the Northern Cape Province. The present Elcar milling plant is producing about 700 tons of blue asbestos - crocidolite - monthly, and this will add substantially to Griqualand Exploration's output of this mineral. 243 PROGRESS IN SPECIFYING SOUTH AFRICAN AS3EST0S GRADES. H. A. 3. Engelmohr. South African St nd^rds 3ull./Suid-Afrikaanoe Standuardebulletin, Nov 1964, 18, No.3, 69-71. The history of the work on the standardisation of South African asbestos grades, done mainly by the South African Bureau of Standards, is briefly described. The work is still not completed, and especially testing methods have not been established as yet, since more consultations are needed. It is also proposed to establish a laboratory for testing asbestos fibres. NEW SOUTH WALES. AS3ESTCS. Mining Journal, March 4 1966, p.l52. Preliminary examination of deposits near Barrnbn is believed to have shown a potential for more than 18 million tons of white asbestos. The deposit is being explored by a wholly-owned subsidiary of Merit Oil Ltd. of U.S.A. ,the W'oodsreef Asbestos Co. Ltd. ,'Woodsreef, and i Ampol Petroleum, each hold 50 percent of White Asbestos(I.Iining)rty, Ltd. * formed to develop the leases in the Barraba area. f > j 245 YUGOSLAVIA. NEW ASBESTOS DEPOSITS FOUND IN YUGOSLAVIA. Gummi-Asbest- i Kunststoffe,i960,19,No.2,173. si Deposits of high-quality asbestos have been discovered at Picely at Kosovska Mitroivca(Yugoslavia).The reserve is estimated to amount to I mabeonut t p4ra.g5ramrrai1tp1.tionncslu.Tdhinegfiurmu-rvKr.o-islmce.ltrains+b.nesttuhrasprodneevnenloipriegd thlaergaenbeinnv+.eoos.t ASARCO ALV 0006363 66 AS3EST0S BULLETIN AMERICA. 246 ASBESTOS DEPOSITS IN MEXICO. Ingenierie Quim.(Mexico). 1965, lOj. No. 106, 10-17. Serpentine dike characterised by asbestos mineralization occurs at El Novilo in Sierra Madre. The asbestos-bearing zone, about 10 km. in length and 1 km. in width, lies 18 km. from Victoria Township (Tamaulipas State). It contains chrysotile asbestos of high quality. Small deposits of actinolite asbestos occur at two other locations, viz., in Sierra Madre and at Camacho; they contain inclusions of chrysotile and anphibole asbestos. Tremolite-actinolite and chryso tile asbestos have been formed in the Gerrero State, but they have not been fully investigated as yet. 247 MINERALOGICAL INVESTIGATION CP ASBESTOS 0? BOLIVIA. ?. Ljunggren et al. Bol.Inst.Boliv.Petrol. ,1965, 5., No.1-2, 35-38. Crocidolite deposits occur 50 km. north of Cochabama(Bolivia). The length of crocidolite fibres vary from microscopical sizes to 1 m. They are very strong; their tensile strength ranges from 70 to 225 kg/mm . Their resistance to attack by acids is very high.Density is 3-00; compared with South African crocidolite, the Bolivian variety contains more Mg and less PeO^. JAPAN. 248 ASBESTOS. Mineral Trade Notes, Voi.62, No.4, April 1966,p.7. Product!on(Hokkaido Mine) 1963 16,520 metric tons 1964 1F73TO metric tons 249 IMPORTS INTO JAPAN. Country 1963 Metric Value C.I.F. of Origin Tons 1,000 U.S.# Canada Rep.of S.Africa U.S.S.R. United States Other countries 69,113 24,160 11,901 3,978 6,340 Total 115,492 10,195 2,989 1,228 560 1,075 16,047 1964 Metric Value C tons 1,000 U.I 84,067 29,005 13,641 8,128 9.128 143,969 11,954 4,760 1,173 1,119 1,547 20,553 Source: Foreign Service Despatch A-560, Nov.26, 1965 - Tokyo. j ! ASARCO ALV 0006364 I I ASBESTOS bulletin I PART 2. ASBESTOS CEMENT. 67 f 250 I I PRODUCTION OP ASBESTOS CEMENT PIPES BY THE AUTOCLAVE METHOD. I. Z. Volchek et al. Stroit Mat., 1966, 12, No.3, 19-20. Autoclave process for the production of asbestos cenent pipes at Aknyanskii Zavod is described in detail. The process comprises a preliminary hardening on the conveyor, storing for 16r20 hours before machining and then autoclaving for 10 hours in^total(the maximum pressure being 8 atm. gage). The loading and unloading is done automatically. The density of the products is up to 1,75 g/cm3. 5v,e tensile strength of the cices of diameter of up to 100 mm. is 142-190 kg/cnP, with diameters larger than 200 rm. tne tensile strength reached 216 - 275 kg/cmd. (Pull translation will appear in the next issue of the Asbestos Bulletin). RUSSIAN PATENT 178,718. PRODUCTION CP ASBESTOS CEMENT ARTICLES. I. Z. Volchek et al. 1 In order to increase the strength and density of asbestos cement; products a semi-dry mixture is laid on the conveyor in several thin , layers; each of the layers is densified with perforated rollers, : reinforcing members with layers of cement adhesives are laid between t the layers and then the whole assembly is passed through a calender. ; 252 ; FRENCH PATENT 1,414,192. MOULDED, FIBRE-RSINPCRCSD RESIN ARTICLES. Johns-Marville Core. f Shaped articles, such as pipe joints, and plastic articles of large ; dimensions are produced by the transfer-moulding process using a ? fibrous sheet,impregnated with a heat-hardenable resin, such as 2 epoxy, phenolic,' epoxy-novolac or polyester resins. The impregnated I sheet is formed into a tubular cylinder which is heated at 66-177C ] and introduced into a transfer-moulding apparatus. Suitable fibrous ; materials include asbestos paper and glass fibre mats. The asbestos paper can contain other fibres (e.g. nylon), fillers, organic mater- j ials etc. i . | 253 FRENCH PATENT 1,430,834. ASBESTOS CEMENT PRODUCTS. ' Philip Carey Mfg.Co. , . Asbestos cement products comprise a mixture of mineral fibres con- .% taining a major proportion of asbestos fibres,mainly of soft chryso;.|T tile asbestos variety and a minor proportion (2-25 wt.$)of hard glass. .* fibres having a diameter of 5-25 microns. V ASARCO ALV 0006365 iWU imlllHWU iM iBip r~' ASBESTOS BULLETIN 59 260 INTENSIFICATION OF THE HYDRATION PROCESS FOR HARDENING ASBESTOS-CEMENT PRODUCTS. M.I. Strelkov and B.F.Pedoryakin. Translation from Russian This article describes the technical aspects of making asbestoscement using pre-hydrated Portland cement. It has been proved that it is possible to speed up the hardening process of the binder by using deeply pre-hydrated cement, that is cement with specific surface area of 5500 - 6500 cm^/gr. and contain ing 15 tD lOfo of new formations. Prehydration of the binder permits intensification of the hardening process, reduces the period in which the ultimate strength is reached, lowers consumption of the binder and makes it possible to eliminate steaming, while improving the quality of the product. By using deeply pre-hydrated Portland cement a binding strength of up to 400 kg/cm2 can be achieved which is by 100 kg/cm2 niore than using ordinary portland cement, speed cf the asbestos cement hardening process is considerably increased; ier example in 15 to 20 minutes after the product being made, it results in a strength of 60 - 80 kg/cn2, but after a day/when kept under air humid conditions it reaches 250 - 280 kg/cm-. Under the normal conditions, when cement is combined with water, around each particle of the binder a film is formed of new formations, which seals the reactive surface cf the particle and restricts furth er interaction of the 'water with the cement. The speed cf the hydration is determined not by intensity of the chemical reaction, but by the amount of the water percolating the film of the new form ations. For this reason the speed of the chemical reaction, 'while being very high,- is slowed down and so, accordingly, the hardening process. The pre-hydration of cement by additional wet grinding consid erably lowers the film's negative role during the hydration's stages and by this accelerates the chemical reactions ox the hardening process. This is confirmed by the kinetic heat evolved during the hardening process of a3bestos-cement made with pre-hydrated portland cement. The thermal effect while being a function of the exothermic reaction of cement with water, permits the determination of the cement's hydration process. Fig.l shows temperature changes during cement hardening. The curve of ordinary Portland cement is similar to the curve i ASARCO ALV 0006367 70 ASBESTOS BULLETIII v as determined by A. A. Baikov. It has a horizontal section during the setting period in contrast with the deeply pre-hydrated cement orasbestos-cement where the horizontal section is absent. A rapid rise of the temperature, the maximum of which is reached in five hours instead of 13 ones for the ordinary portland cement, proves the less ening of the film's negative role. The amount of the chemically bound water in the original cement as shown is 0.32$, but after regrinding it increases to 3*47$. The samples made with these two cements were hardened under normal humid air conditions. The samples made with the pre-hydrated portland cem ent at all stages of the hardening period contained approx. 5$ more combined water. Many investigators pay attention to the particle size distri bution as to one of the main factors determining the hydration process. It has been proved that the particles of up 30 microns are the basic carriers of the cement's strength qualities. The fraction under 3 microns contributes only to the cement's initial strength, but the fraction over 60 microns does not take any part during the hardening process., A characteristic peculiarity of the pre-hyarated cement is the absence of inactive particles from 30 to 60 microns. Thus the inactive fraction of the ordinary portland cement is converted into an active binder. The second characteristic difference of the pre- hydrated cement is the considerable content(approx.45$) of particles under 3 microns, 15$ - 2 to 3 microns and 30$ - 1 micron or under. The specific features of fractional composition of the prehydrated cement as investigated by Anderegga and Hebella,Eoka,Iopitala and James and the data of Butta proved that, at an average hydration speed equal to 1 micron in a day, the majority of the particles will be hydrated in 20 days. It has been observed that approx.97$ of the pre-hydrated cement has reacted with water. The intensification of the hardening process of the pre-hydrated Portland cement is also confirmed by the thermal analysis(fig.2). On the left are curves showing the loss of weight and thermographs of the hardened portland cement at 3 days for ordinary portland cement and the pre-hydrated one. nThe first low temperature endothermic effects observed up to 200C are due to the presence of the calcium hydrosulphoaluminates (50 - 120C) and calcium hydroaluminates (140 - 150C). For the pre-hydrated cement these effects are more pronounced as confirmed by the curves of the weight loss. The latter between 50 and 120C is twice as high and equals 15$. Such a feature must be explained by the higher reaction speed of the pre-hydrated cement with water. The second endothermic effect which points to the decomposit ion of the hydrated calcium aluminate and hydrated calcium silicate (curve B) is also higher. The increase of this effect means the ASARCO ALV 0006368 ASBESTOS BULLETIN 71 intensification of hydration not only on the account of the domin ates present(low temperature effects)but also of the calcium silicate. The loss of weight for the original portland cement is 2 - 3^,but for the pre-hydrated - 3.5$. The third endothermic effect is charact erised by the dehydration and decarbonisation processes of the cal cium hydro silicates. This effect of the pre-hyarated portlgnd cement starts" somewhat before 610C and reaches its maximum at 700l'C. The loss of weight increases approx. 1.5 times. The values of the ob served effects for cements at 28 days age are increased. The loss of weight for the original cement is 125^,but for the pre-hyarated 20?;. Loss of weight on the account of the 2nd and 3rd endothermic effects for the pre-hydrated cement is approximately 2i* higher. In tables 1 and 2 are given the strengths and frost resistance figures of laboratory asbestos-cement samples. Intensification of the hydration process of cement by the suggested methods speeds up the hardening of asbestos-cement and results in higher ultimate strengths. Erost resistance tests of the asbestos-cement samples made with pre-hydrated portland cement were carried out according to the national standard 378-60. As cc.n be seen from table 2 these samples only after 150 cycles of freezing and thawing are slightly loosing their strength. High frost resistance of asbestos-cement is most important,because it contributes to its durability. On condition that the pre-hydration proceeded up to 15 to 12$ of new formations specific pressure of 150 kg/cm2,temperature of the pressing surfaces 9CC and asbestos content of 13-15?=, the water absorption ^f.the asbestos-cement is 17? at sd. gravities of 1.68 to 1.72 gr/cm-h It must be noted that the micrcstructure Hoe asbestos-cement samples made with a pre-hydrated portland cement are characterised by negligible amount(2 - 55 e.t 28 days age)of small sise(7 microns) grains of clinker minerals,and by their uniformity and high density. Thus the pre-hydration of the portland cement for making asbestos-cement products intensifies the physico-chemical processes taking place during the hardening and this in turn helps to obtain higher strength products. Pre-hydrated portland cement was used at the Kharkov electro-mechanical factory for making compressed asbestoscement articles,the strength of which proved to be over 400 kg/cm2 and the impact resistance 5-6 cm/cm2. Before the factory was using a hardening process which included 16 hours of air hardening,18 hours of steaming and 15 hours of drying. Y/hen using pre-hydrated portland cement it was sufficient to submerge the articles in water for 2 - 3 hours and this secured their high strength. Pre-hydrated portland cement is al3o used for making frameless asbestos-cement wall panels. For this asbestos-cement mixture of plastic consistency was prepared, but the hardening was carried out under air conditions. The period of keeping them in moulds was reduced from 5-7 days to 20 - 24 hours with simultaneous improvement in the quality of the panels. ASARCO ALV 0006369 2 ASBESTOS EULLETIN TABLE 1. The degree of prehydration of Portland cement in i Temp. of the mould "c 0.65(original cem.) ditto. 18-20 90 191(orehydrated c em..) 18-20 ditto. 90 Ultimate bending strength in kg/cm4 aft er 20 4 1 min. hrs. day 7 n 28 9 days mths. 0 0 120 199 302 335 0 0 200 256 289 362 20 60 70 100 231 2 50 '.05 379 421 413 463 TAB!E 2. The number of freezing and thawing cycles 25 50 75 100 125 150 0 Ultimate benci r.g str ength in Kg/cm Control S r*"" i.C s A 1f* t/w71j, +sJ LV+V--p test 334 361 365 400 410 429 423 430 430 430 43,2 428 261 BELGIAN PATENT 665,619. Y/ATE3 PAINTS. Y/acker Chenic,GmbH. Paints suitable for protecting plaster, asbestos cement and concrete against moisture consist preferably of 0-60^ water, 40-90 of a mixture of pigments and alkaline organosilicones(e.g. potassiun methylsilicone), and 0--2i<> of other binders and/or additives normally used in paints. " t '? ASARCO ALV 0006370 Pig. 1 rinetics of the heat evolved during the hardening of "she products. 1 - nab.-cors. or. the basis of prshydrated Portland cement2 - prehydrated Portland oeuent 3 - asb.-eeia. on the basis of ordinary Portland cement 4 - ordinary Portland cement. Tsasp. in c. co xo ix rx swra? tss ::j sx t> kx .<xs i % hiI U ! M'v 1 \ nihil ;Vrf^"--,1 `rK*i 11 i ! fyt*1n! j-'\'m:r TYr"11; mm P'Th ^mi r!--.!f1 sl -H i'i *n- 1 !V!l! 1 :jl ki Pig.2 Thermograms and curves of weight losses of ordinary (a) and prehydrated (b) cements after 3 days -(on the left) and 28 days hardening. ASARCO ALV 0006371 asbestos bulletin 75 262 MODERNIZATION 0? MACHINES FOR THE PRODUCTION 0? TILES, S. V. Khnyrov, Stroit.Mat.,1966, 12. No.2, 8-9, A number of improvements in machines for the production of asbestos cement tiles are described. Applications of pre-heating rollers improves the effectiveness of the compressing process. A special tubular device has been introduced to promote the removal of water by means of an air stream and thus to prevent metro-absorption of moisture by the formed tiles. Rubber-lined large diameter rollers are used for squeezing water from the asbestos cement mass. Suction system has been improved by introducing two suction boxes 'working at different pressure gradients. Driving system has been modified. Improvements have been introduced in the equipment ana procedure for cleaning the cloth and the screen cylinders. A semi-automatic line for metering, feeding and processing asbestos fibres has been devel oped. A continuously working mechanical device for cleaning the recuperators and removing foam has considerably enhanced their pro duction capacity. 263 GERMAN LATENT 1.70.',; 032. ASBESTOS CEMENT .CUING RINGS FOR MUFF FIFE J1IAIS. Toschi G.m.b.H. Asbestos cement rings for muff pipe joints are provided with sawtooth-profiled ribs, which are located on the inner side of this part of the ring 'which is directed towards the muff mouth, and on the outc-r side of the other part of the ring. 264 FRENCH PATENT 1,417,893. IMPROVING FIRE RESISTANCE OF STRUCTURAL PANELS. Badische Anilin- a Soda-Fatrih. Fire resistance of structural panels, e.g. asbestos cement panels, is improved by coating the surfaces of the panels with a layer of and, to protect the panels against moisture, an external covering of a plastic material, e.g. a prlyanide may be applied. 265 RUSSIAN PATENT 163,939. PASTES. A. Ivi. Karasynuk. An improved paste, based on dried wastes from washing waters of the asbestos cement industry and suitable for the production of struct ural materials and the like, contains up to 60 vol.$ of the above Mentioned waste material (dried to 40-60$ moisture) and up to 40$ 03^ "black binder". The paste imparts to structural materials imperm eability to water and gases, and also anticorrosive properties. I ASARCO ALV 0006372 IO ASBESTOS BULLETIN 265 FRENCH PATENT 1,415,041. TREATMENT OF ASBESTOS FIBRES V/ITH A EYEROI/iODIFIER. Johns-tfanvilie Corp. In British Patent 922,427, compositions comprising asbestos fibres with a hydronoaifier are described. This invention relates to a method for applying the hydromodifisr onto asbestos fibres. According to the invention, asbestos fibres are suspended in air together with a finely comminuted hydromodifier(2T* based on the weight of asbestos) and a spray of fine water droplets is applied, so that the moistened hydromodifier adheres to the asbestos fibres. The fibres are then dried. In an example, ch.rysotile_ asbestos fibres are coated(not necessarily in a continuous manner) with hydroxy-propoxy1-nethyic e11ulose as a hydromodifier. Other varieties of -asbestos may be treated 267 SOUTH AFRICAN PATENT S5/C570. OPENING ASBESTOS BUNDLES Asbestos fibre agglomerates are suspended in a Liquid, and the suspension is conveyed through conduits gradually and repeatedly varying in cross-sectional at a high frequency. PART 2. ASBESTOS TEXTILES. dot BRITISH PATENT 1,003,105. IrPRCVETENTS IN AND RELATING TO FIRE RESISTING CABINETS. St raw ford Equipment Co. Ltd. -- A- -L > resisting cabinet -acccrdinr to claim 1 or 2 wherein asbesvos taoe or other thermal insulating * o t r v" striz: ierr* is r.ico provided between abutting surfaces of the cabinet body and the door. 26S FRENCH PATENT 1,411,473. TRANSPORT CONTAINERS FOR RADIO-- ACTIVE PRODUCTS. Lener & Cie. Hea.t- and shock-resistant containers for radioactive materials consists of two layers of biologically screening materials, the internal one being more dense than the external, and comprise fire proof materials including envelopes of asbesvos cloth, and powdered asbestos, vermiculite or plaster used as fillers. 270 BRITISH PATENT 1,010,361. ECTRICAL INSULATION. English Electric Co. This patent is covering insulating material comprising of asbestos fabric impregnated with a cement consisting of a micaceous powder nixed with a solution of phosphoric acid. J 4 S ASARCO ALV 0006373 ............................................. iw<iiw> iw<m>n. ASBESTOS bulletin 77 271 SOUTH AFRICAN PATENT 65/3156. British Belting & Asbestos Ltd. YARNS. Composite yarns comprise asbestos combined with staple glass fibres. Preferably the staple glass fibres are spun or doubled with the asbestos. 272 BRITISH PATENT 1,02 3,972. IIuPROVELENT RELATING TO YARNS COMPRISING STAPLE ASEESTOS YARN. Turner Bros.Asbestos Co.ltd Yarns are composed of slivers of staple fibre asbestos and a smooth glass continuous multifilament. PART A. ASBESTOS FRICTION MATERIALS. 273 BRITISH PATENT 1,017,181. CORE::SION RESISTANT BEARINGS. Urn T.-td. The porous bearing matrix is made of asbestos cloth, yarn or cord soaked in a solution of a nitrite and or benzoate of an alkali metal or alkaline earth metal which afte r evaporation of solvent leaves a fine deposit of crystalline nitrit e within the porous bearing struct- ure. 274 72T2T rxp TC! IT *2 A rx^*T-T-'/TXl TXjU/h-*.|7/ /, (CT X XxL uiTlfUi*Tl -mJTJL ^O ^ ^ ^ L. O *J l Clutch facing produced by a novel method was made from solids consisting of: powdered phenol formaldehyde resin 20 parts by weight asbestos fibre 50 11 "" powdered, cured resin of cashew nut shell liquid 17 " barytes 13 " 275 CANADIAN PATENT 713,479. FRICTION ELEMENT. Chrysler Corp. Friction elements having good friction stability and fade resistance are produced by forming into a predetermined shape a dry composition consisting of grade 5K asbestos fibre, particulate "cardolite NC-lll" resin, zinc oxide and an uncured synthetic rubber copolymer, e.g.- a butadiene-styrene or butadiene-acrylonitrile copolymer, and curing the shapes in the presence of an oxygen-containing gas at a temoerature of about 290F. 'I U ASARCO ALV 0006374 78 ASBESTOS BULLETIN 276 EFFECT OF TEMPERATURE OR FRICTION AND WEAR CP PILLED FLUORIDATED PLASTIC MATERIALS. N65-29121 Air Force Systems Command, Wright-Patterson APB Ohio. Foreign Technology Div. V. D. Parkhomenko and S. IT. Gants, 19 Apr. 1965 6p. refs. Transl. into English from Izv. Vysshikh Uchebn. Zavedenii, Mashinostro(Moscow), No.9 1963, p.130-133 (FTD-TT-64-117 6) 1+2; AD-614957. An examination was made of the effect of temperature and the nature of the filler (molybdenum disulfide, boron nitride, barium sulphate, ground coke, talc, soot or colloidal graphite) on the coefficient of friction and wear of "fluoroplast" (poly-(chlorotrifluoro ethylene) ) while undergoing a water lubricated friction process. In general: 1) wear decreases with increasing filler content (up to a limit): 2) wear increases by increasing water temperaxure: 3) the coefficient of friction (mu) increases as temperature increases; 4) mu decreases with increasing specific pressure; and 5) rau decreases with increas ing speed of sliding. Under the test conditions MoS0, BN, Bare, and coke improved the wear resistance ;o a greater extent than oxnc-r fillers. 5. ASBESTOS REINFORCED PLASTICS. 277 ASBESTOS-REINFORCED PLASTICS. G. L. IVickc-r. Gurmi-AsbcstEunststoffe, 1966, 19, No.3, 293-297. "Duraform" products manufactured by Turner Brothers Co. arc thermo plastic polymeric materials reinforced with asbestos fibres and produced in the form of plates. Pour kinds of "Duraform" produces marketed at present are described, and their properties are compared with those of thermosetting or thermoplastic polymeric materials reinforced with other inorganic fibres, particularly glass fibres. The "Duraform" products compare favourably with other materials, in particular their modulus of elasticity is two or three times that of similar products, their tensile bending and impact strength is high, they possess a good resistivity to chemicals and to weathering, they are non-inflammable and relatively cheap. Their possible applications, especially as structural materials are wide. 278 BRITISH PATENT 1,010,043- IMPROVED ORGANIC THERMOPLASTIC MATERIAL AND PROCESS. FOR ITS MANUFACTURE. Societe Orgar.ico. The object of the present invention is to provide an organic thermo plastic material which is improved by the addition of discontinuous mineral fibres, in which the said fibres are distributed in an inti mate and uniform manner throughout the mass of the thermoplastic material. The material contains asbestos fibre. ASARCO ALV 0006375 r i.SBH-STOS BULLETIN 79 27a GERMAN PATENT 1,187,013. MOULDING PREPARATIONS CONTAINING UNSATURATED POLYESTERS DERIVED PROM CERTAIN DIKYDRIC ALCOHOLS Farbenfabriken 3ayer. Heat-hardening compositions are prepared from unsaturated polyesters, derived from dicarbocyclic acids, or their derivations, and specified dihydric alcohols, with the addition of inorganic or organic fillers, organic peroxides, dyestuffs, lubricants and other ad.iurants. In an example, to 750 parts of a polyester obtained from bis-(3-nsthy1-4-2- hydroxyethoxy-5-chlorophenyi) methane and fumaric acid, with addition of a small amount of hydroginine-quinone mixture, are added 200 parts i- of diallyl phythalate, 100 parts styrene, and a mixture of 800 parts mica flour, 250 parts asbestos flour, 20 parts SboOa and 30 parts of zinc stearate, followed by 30 carts of 505' tsrt.-butyl perbenzoate Dasxe. Prom this non-tacky ha urt Cq Uu ru, i[w ...J. Av* o * VIcA j k/XV1 P1 w\'rt*U~TyCZ i-cJr-.j *Vr---H iV-">g co-4 high flame-and heat-resistance and outstanding me curin' properties can be manufactured. Pillers suitable for these com; ;icr.s also include asbestos fibres. 20U "T' Hi-AO j. 'w -'.HA'.i. w Xi O - a.. * -- i'i QA --*r--*. EE'TNTt ` 't-ti pry' ---rr : r. H. Sale 27 -:c-i.l554 , ^j--.p. rs_ i<7s1 . (f --n se. t. -o--v* -cu5c ? AD-452938) CTSs_ /C.75. N65-15977 Rock island A ""I " O nK'. pmI -ao. The development of flexible, elastomer!c-basc-d solid propellant rocket motor case insulation is discussed. The effects on insul ation properties of the type of asbestos, of liquid versus solid elastTiers, and of the methods of dispersing fibrous compounding ingredients, are reported. Oxyacotyleno torch and static.motor firing test data for some of the better insulation materials devel oped, as '.veil as for some commercial materials, are presented. A matsrir.l^with 105 elongation, 1.2- gn/cc density, performance index of 95 cm^sec/gm and erosion rate of 2.C miis/sec was the most promis ing insulation developed. The material is a 55/45 cutadiene-acrylonitrile compound containing phenol furfural resin, asbestos and oxyazoline -wetting agent. It was satisfactorily bonded to aluminium ana steel by conventional bending agent. The thermal properties ofQt1his vulcanisate are not affected by oven ageing for one week at 70 C. 281 BELGIAN PATENT 67C,7 A *T J ACCUMULATOR PLATES. M.A.L.Ronsmans. Accumulator platc-s are described containing graphite as an electrical conductor, a plastic material as a substrate, fillers, such as clay, and reinforcing agents, such as glass fibres or asbestos. / * ____ ASARCO ALV 0006376 \ A 80 ASBESTOS BULLETIN 282 EAST GERMAN PATENT 43,480. FREE-FLOWING POLYESTER MOULDING PREPARATIONS. C. M. Hiller and G. Schubert. Polyester resins are homogenised with fibrous or non-fibrous fillers and then milled to give a free-flowing powder aggregate. In an example, a moulding preparation was produced from 420 parts of a polyester (obtained by reacting maleic or pnthalic anhydride with propylene or ethylene glycol with addition of 1$ glycerol), ISO pts. of diallylisocyanate, 615 pts. of kaolin, 85 pts. of asbestos fibres, 20 pts. of zinc stearate and 12 pts. of dicumylperoxide. 283 BRITISH PATENT 1,005,164. AMINOPLASTIC MOULDING COMPOSITIONS. British Industrial Plastics Ltd. Asbestos mentioned as a filler. PART 6. 3UILDING MATERIALS AND PLASTIC PIPES. 284 FRENCH PATENT 1,414,301. BUILDING MATERIAL PANELS. A. A. M, C. Rambourg. Structural panels are produced by soaking vegetable fibres, such as resinous fibres from pine, in a solution containing sodium silicate, denatured alcohol and powdered silica gel, at a temperature of 40 C, for A hours. The impregnated fibres are then mixed with cement, powdered asbestos and water, and the mixture is subjected to a press ure of 2,500 kg/cm^ at a temperature of 285 BELGIAN PATENT 665,440. ASBESTOS BOARD. Philip Carey Mfg.Co. Asbestos board is produced from asbestos fibres and a minor amount of a heat-resistant inorganic binder. The fibres comprise at least 30 wt./B of amphibolic asbestos which is tenacious and flexible- and is particularly suitable for the production of paper. The binder is a mixture of a hydraulic cement and a montnorillonite clay. The board shows a very low shrinkage on heating. The product has a consider able elasticity and can be used at 650C for long periods without substantial structure deterioration. 286 CANADIAN PATENT 647,631. ASBESTOS CUSHIONS IN METAL-CLAD BASIC REFRACTCRIES. General Refractories Co. 3asic refractory bricks for furnace roofs comprise a chromite or magnesite refractory section, an oxidisable metallic section, and an asbestos cushion disposed between the metal and the refractory mater ial at the hot end of the bricks. I ASARCO ALV 0006377 ,'fmp;,r.7 'ni;-'ir'. w n w w qiwim p llliig^PWWJJiwW1^ AS3EST0S BULLETIN 81 287 BRITISH PATENT 1,020,917. BUILDING PANEL. Boron Insulation Limited. Manufacture of building panel include step of casting on one or both sides of a core layer (expanded synthetic resin) a surfacing layer of asbestos cement, the surface of core being grooved to provide good mechanical bond. 288 POLYMER MATERIALS FOR COVERING FLOORS IN PREMISES OF THE DAIRY INDUSTRY. G. S. Kogan et al. Stroit Mat., 1966, 12, No.2, 25-27. Working conditions for floorings in the daily industry and technical characteristics of various materials used for floor coverings are discussed. The materials described include polyvinylchloride tiles containing asbestos as a reinforcing agent. 289 CANADIAN PATENT 647,790. RADIATION-RESISTANT SLA3S, BRICKS ETC. P. Jolly. Structural or shielding units having high resistance to heat and radioactive radiation are produced from anhydrite powder, .asbestos fibres, a metal sulphate and sodium silicate, with addition of a minor amount of hydrochloric acids. 290 CZECH PATENT 114,331. WATER-ABSORBING PLATES. F.Sembera. Water-absorbing plates having improved thermal and mechanical stability are produced from a mixture of 5 - 60 wt.5= cement, 1-30 wt.$ slaked lime, 2-70 wt.fc asbestos and 1-40 wt.^ charcoal. 291 PVC PIPES USED FOR RIVER CROSSING. Pipes & Pipeline International, April, 1966, p.59. Laying of twin 12 in. diameter sewage pumping mains across the 100 ft. wide River Wearer was carried out by lowering of complete assembly into a trench dredged in the river bed. 292 NEW PVC PIPE JOINT. Pipes & Pipelines International, April, 1966, p.64. A rubber ring push-fit joint for PVC pipes, has been introduced in the United Kingdom by Yorkshire Imperial Plastic. ->-:.;*V,"iv\-a VV-;s; ofc;q>v^i1V`'?; ASARCO ALV 0006378 82 ASBESTOS BULLETIN 3 PART 7. ASBESTOS PACKING,COATING AND SEALING COMPOSITIONS. \k 293 STRUCTURAL-MECHANICAL PROPERTIES OF HERMETIC MASTICS. G. B. Ivyanskii and A. T. Gureev. Stroit.Mat. 1965,11, No. 12, 17-18. Rheological properties have been determined for a number of mastics' including "Izol", which is produced from rubber wastes, bitumen, coumarin resin, colophony, asbestos fibres and antiseptic agents M-1("Izol" is used for sealing, "Poroizol", and also shows very good adherence to 'concrete). It has been found that the viscosity of all the mastics tested depended on some internal structure of the material, when this structure was destroyed the viscosity dropped sharply. 294 CANADIAN PATENT 710,228. BITUMINOUS SEALING COMPOSITION. Gulf States Asphalt Co. A bituminous adhesive and sealing composition, which is permanently non-hardening and non-drying comprises 45--95 wt.$ of a petroleum derived bitumen and 2.5 - 27.5 wt.$ each of bentonite and asbestos fibres or wollastonite. The composition adheres to glass, metals, concrete, ceramics, cloth etc. It i3 especially useful for sealing joints of concrete, ceramic or metal pipes. 295 EAST GERMAN PATENT 44,097. SEALING COATS FOR SPRAYED ASBESTOS INSULATIONS. R. Hancke and J. Mann. The sealing coat for asbestos insulations is made frem cement and asbestos fibres bound with a butadiene - styrene copolymer latex or polyvinyl acetate latex. 296 TAR-EPOXY RESIN COMPOSITIONS. A. Ritter. Plaste und Kautschuk, Dec. 1965, 12> 731-734. Tar-epoxy resin compositions have proved to be very useful in chemical plants,marine engineering,mining and pipeline constructions, due to their good weathering resistance and low cost. The epoxy resins are cold-cured to various degrees of polymerisation. The best* curing agent3 are aliphatic triamines. Low-boiling solvents should^,, be used. Asbestos and slate powder,-used as extenders, improve the-'' resistance of the product to concentrated acids and solvents. 297 BELGIAN PATENT 659,006. IMPROVED COATINGS. Siemens-Schuckert-' werke. Coatings for protecting building materials and metals comprise a disj. persion of a filler such as talc,mica,graphite or asbestos,in an aqu?- eous medium with addition of an emulsified varnish such as alkyd & resin lacquer. ^ ASARCO ALV 0006379 asbestos bulletin 83 298 CANADIAN PATENT 644-,911- MASTIC COMPOSITIONS. Benjamin Forster Co. A mastic composition for application to exposed surfaces of metals, insulation blocks, slabs or pipe coverings, is prepared from 28 wt.$ of petroleum asphalt, 24$ of pulverised slate, 10f each of chlorin ated phenyl and petroleum distillate, 6$ each of asbestos fibres, 1,1,1-trichloroethane and perchloroethane, 4$ of pulverised mica and about 2$ each of gilsonite, antimony oxide and calcium carbonate. PART 8. ASBESTOS PAPER AND INSULATING MATERIALS. 299 FRENCH PATENT 1,414,226. DRYING PAPER. Mead Corp. Paper having high moisture absorption capacity is produced from 33-67$ of inorganic fibres, such as glass fibres (preferably), quartz fibres, asbestos and the like, the remainder being an inorganic dry ing powder, such as an inorganic molecular sieve silica gel, activ ated alumina or powdered porous silica-case glass. 300 GERMAN PATENT 1,134,200. PROCESS FOR IMPREGNATING CELLULOSIC MATERIALS OR THE LIKE IN A PAPER-MAKING MACHINE. H. Kohlmann. A process for impregnating paper-,cardboard-or asbestos-pulp, or the like, with size, kaolin, starch or resins, or solutions or suspens ions thereof, in a paper-making machine is characterised in that the drying of the material is interrupted when the water-content is 5-157 and, before the impregnation, an air-current is directed against the surface of the material to remove moisture and dust, and to cool the material. In this way the conditions of the impregnation process are considerably improved. 301 CANADIAN PATENT 647,342. RESIN-ASBS3TCS COMPOSITIONS. C. L. Blake. A composition suitable for pipes, sheets etc., having good fire resistivity, good strength and controllable insulation charactaristics comprises about 15 wt.$ of asbestos fibres, 20 - 30$ of a resinous plastic binder, 1 - 20$ of a plasticiser, and 50 - 60$ of an inert filler. 302 THE USE OF ASBESTOS BOARD IN DRYING CHAMBERS FOR PVC TILES. D. Dejan et al. Meter, de Constructie/lnovatii (Bucharest), 1964,-No. 31, 30-32. An apparatus for heat treating pvc flooring tiles comprises steel sheet chambers lined with asbestos board and heated to 180C with methane. -h-=.--i..-...r..~--,, ASARCO ALV 0006380 84 ASBESTOS BULLETIN - 303 RUSSIAN PATENT 179,214. PRODUCTION OP HEAT-INSULATING MATERIALS. R. I. Arav et al. Heat-insulating materials are produced by mixing asbestos with magnesium carbonate trihydrate, heating the mixture at 120 - 150 C, and then additionally firing the mixture at 550 - 600 C for 4-6 hours, in order to improve its refractoriness and to reduce its density. 304 GERMAN PATENT 1,197,370. PREPARATION OP LIGHT POROUS STONE jk l INSULATING MATERIAL BY CHEMICAL BINDING. Chamotte-Industrie | Hagenburger-Schwalb A.G. ] Light porous stone, and also insulating materials, are prepared from | a mixture of expanded polystyrene, as a porous medium, a binder and r- ' s a filler. In an example, polystyrene powder, expanded in boiling water, was mixed with cement, chamotte powder and water; after i moulding and setting, the articles are dried and the polystyrene is ; volatolised at 250C. Other suitable binding materials include kieselguhr, asbestos, vermiculite etc. 305 HIGH TEMPERATURE HEAT-INSULATING MATERIALS. Stroit Mat.1966,, i 12, No.2, 34-35. \ Various heat-insulating materials suitable for'use at high temperat--? 1 ures are briefly characterised. Calcium hydrosilicate-base materials," li t which can be used at 300 - 1C00C, are produced from lime, siliceous c i materials and asbestos, subjected to autoclave treatment; a factory : at Kremgese will produce this year 100,000 m.^ of this material. ^ A novel heat-and sound-insulating material is based on kaolin fibresT "Kaolin Y/ool" is a white fluffy material consisting of 1 - 3 micron ] fibres; it can be used at temperatures of up to 1100C and, for a short time, even up to 1250C. Kaolin wool can be used for filtering, hot or corrosive, liquid or gaseous media. Paper or cardboard can -r i be produced from kaolin fibres for use as high temperature electric insulations. i 306 FRENCH PATENT 1,416,243. MOULDED HEAT-INSULATING PRODUCTS. ,, Philip Carey Manufacturing Co. Heat-insulating materials are produced from 40-80$ of expanded per lite, 5-20$ of montmorillonite as a mineral binder, 4-10$ of a low viscosity starch derivative capable of forming flexible films, 1-4$ of a phenolic resin as an organic thermo-hardening binder, 5-25$ of short asbestos fibres (grade 7) and 0.2-3$ of long glass fibres as mechanical reinforcing agents. ASARCO ALV 0006381 asbestos BULLETIN 85 307 CANADIAN PATENT 666,436. LAMINATED THERMAL INSULATION. Johns-Manvilie Corp. Laminated materials having an exceptionally low thermal conductivity, and high resistance to shock and erosion consist of a cellular organic thermosetting resin laminate honeycomb structure heavily reinforced with asbestos fibre. The cells are filled with a low-density particu late material, such as an aerogel and an opacifying material. 308 GERMAN PATENT 1,193,667. PRODUCTION OF COLD-PRESSED ELECTRIC INSULATORS WITH IMPROVED CREEPING-CURRENT RESIST ANCE CONTAINING PHSNO RESINS AS BINDERS AND P0LYIS0CYANATE3. Suadeutsche Isolatorenwerke. Electric insulators are produced from phenol resins, such as phenolresol resins, polyisocyanates, fillers and lubricants. The composit ion is first heated at 150C until water is completely expelled, and then hardened at 165-2Q0C. As fillers, asbestos, limestone or marble flour is used. In an example, 15 parts of phenol-resol are mixed with 5 parts of a polyfunctional isocyanate in acetone as a solvent, and 80 parts of a 1:4 mixture of asbestos and marble flour is added. The mixture is dried as above, and cold-pressed at a pressure of 150 kg/cm2. 309 BELGIAN PATENT 655,583. PROTECTION OF THE BOTTOM OF OPEN INGOT MOULDS. Aciories et Minieres de la Sambre, S.A. Bottoms of ingot moulds are protected during teeming by placing inside the mould, before casting, compact sheets, produced by rolling or compressing a cellulose fibre-or asbestos-base paste. The mater ial may be of the type known as "Unalit". PART 9. REFRACTORY FIBRES. 310 PLASTICS WITH MAGNESIUM-FIBRE REINFORCEMENT. Gummi-AsbestKunststoffe, 1966, 19, No.2, 180. In the U.S.A. a new material has been developed which comprises phenol resins and magnesium fibres as a reinforcement. The material is highly heat-resistant and will be used for aerospace purposes. The heat resistivity arises from a 28$ water content of magnesium fibres - on heating, the water evaporates exerting a cooling effect, 311 WHY DEVELOP NEW COMPOSITES NOW? D.L.Grimes (Whittaker Corp.) Res./Devel., 1965, 16, No.9, 28-31. Tables are given of properties of different composite materials and of fibre and wire reinforcement. Boron fibres are included. i~- ASARCO ALV 0006382 r t : i; L 86 ASBESTOS BULLETIN 312 GERMAN PATENT 1,193,927. PRODUCTION OP ALUMINA FIBRES. General Electric Co. A mixture of a volatile aluminium compounds (such as AICI3 or alumin ium isopropoxide or methoxide), carbon dioxide and hydrogen is pre-. heated and passed through a reaction tube heated at the inlet to at J least 1100C and at the outlet to about 1500C, the pressure in thereaction tube being below 100 mn.Hg. A copious formation of alumina fibres takes place inside the tube. The length of the fibres is up ' to 2.5 mm., and the diameter is C.03 - 0.05 mm. 313 FRENCH PATENT 1,395,829. M0ULDA3LE POLYOLEFINE PREPARATIONS. National Lead Co. A process is described for the polymerisation of olefine containing less than six carbon atoms on the surface of separate silicate fibres suspended in a liquid medium, whereby each fibre becomes enclosed in a polymer sheath. In an example, lOg. of dry asbestos fibres were suspended in 1800 ml. of dry toluene, the suspension was flushed with nitrogen to expel air, and 0.03 mole of TiCl4, followed by 0.03 mole of 41(02^) 3 were added. Then gaseous ethylene was intro duced into the suspension and the temperature was increased to 65C. After three hours, -190g. of polyethylene has been formed, enveloping each fibre (there was no free polyethylene). The fibres thus created were further processed to form sheets. 314 JAPANESE PATENT 19563/65. PROCESS FOR RECOVERING METAL WHISKERS FROM A GROWING BASE. General Electric Co., N.Y. < Whiskers of chromium, gold nickel, copper, iron or cobalt are pro- duced by the gaseous transfer process. Then the growing base with whiskers formed thereon is immersed in a mercury pool to which vibrational movements are applied, whereby the whiskers are separated from the base. A liquid which is inert to the whiskers and collect_ them preferentially, is added to the mercury pool under thorough mixing. Subsequently, the liquid with the whiskers gathered in it > is separated from the mercury, and the whiskers are recovered by filtration. 315 HIGH TEMPERATURE MATERIALS. A. J. Kennedy, Sci.J., 1965, 1, No.6, 38-44. The high strength of boron fibres is referred to, but there are -A/ considerable difficulties: the boundary between the fibre and the A matrix is mechanically and chemically vulnerable and the engineering, use of these highly anisotropic systems raises some serious diffi-1-^' culties. Vv ASARCO ALV 0006383 asbestos bulletin 87 PART 10. MISCELLANEOUS. 316 FRENCH PATENT 1,350,676. ARTICLES FROM FIBROUS MATERIALS. D. P. Ednell. Articles from fibrous materials, especially troughs for conveying molten metals in foundries, are produced from a fibre pulp or suspen sion, by depositing the mixture onto a permeable mould, through which water or any other suspending liquid can be removed, the permeable mould being subjected to oscillating movements during the deposition r of the fibres. The movements can be effected in a longitudinal or transverse direction, or in both directions simultaneously. 317 CANADIAN PATENT 648,133. SETTLING AS3EST0S FLOATS ETC., FROM AQUEOUS SUSPENSIONS. American Cyanamid Co. The flocculation and settling of asbestos floats or short fibres is facilitated by treating the suspension under flocculating conditions with a small amount of water-soluble cationic polyacrylamide and a diallylauarternary ammonium compound. 318 FLOATING FILTRATION FOR VISCOSE SOLUTIONS. E. Riedel et al. Faserforschung und Textiltechnik, Dec. 1965, 16, 598-602. Several materials were tested as filtering aids for viscose solutions having K - values of 200 - 300, including Dederon choppings, natural 1 cellulose fibres, asbestos fibres, kieselguhr, wood flour and pvc e: powder. The best results have been obtained with pvc powder. 319 BELGIAN PATENT 667,965- METAL CASTING PROCESS. Union Carbide Corp. A slurry containing finely divided chrysotile asbestos and a liquid vehicle is applied onto the inner surfaces of an ingot mould having a sufficiently high temperature to cause the evaporation of the vehicle and formation a continuous layer of asbestos adhering to the ? walls of the mould. The molten metal is then poured into the mould and the ingot obtained has a defect-free surface. 320 BRITISH PATENT 1,007,566. IMPROVEMENTS IN OR RELATING TO GRINDING, SANDING, BUFFING AND CUTTING MEDIA. Erwin Meyer. The materials having a micro-foliate structure may comprise pre treated asbestos. 321 BRITISH PATENT 1,010,699. FIREPROOF COVERINGS FOR COLUMNS, BEAMS AND OTHER FEAME7/0RK MEMBERS. Cape Building Products Ltd. I j > ! i.i iii *! i J! I i - ASARCO ALV 0006384 88 ASBESTOS BULLETIN PART 11. REVIEW OP JOURNALS. "ASBESTOS", March 1966. 807 Western Saving Pond Bldg., Philadelphia, Penn. 19107. 322 323 324 325 326 327 328 ' POR DISCUSSION: ASBESTOS FIBRE PREPARATION,J.L.Tucker, p J-M ASBESTOS-ASPHALT PAVING REPORT. Use of asbestos fibre in asphalt mixes has increased four-fold. Chief uses are in thin overlays, bridge deck surfacing and curbing., p.26 MARKET CONDITIONS, p.28. PRODUCTION, p.30. IMPORTS & EXPORTS, p.32. INDUSTRY NEWS, p.38. ASBESTOS PATENTS - Extract from six U.S.A.Patents, p.48. ASBESTOS-CEMENT REVIEW, January 1966. Kirchgasse 40, Zurich, Switzerland. .(This number is mainly devoted to use of asbestos-cement in schools) 329 SCHOOL IN LINDENBSRG, SOUTHERN GERMANY, d.10. 330 SCHOOL AT WEGGIS, SWITZERLAND, p.13. 331 HOOVER SCHOOL AT WAYNE, MICHIGAN, U.S.A., p.17. 332 GRAMMAR SCHOOL AT BERNE, SWITZERLAND,p.20. 333 ARAGON HIGH SCHOOL, SAN MATEO, CALIFORNIA, p.24. 334 SCHOOL IN LORCH, nr. STUTTGART, GERMANY, c.29. 335 SCHOOL POR FURTHER EDUCATION AT BOREEMOSE, DENMARK, p.32. 336 NEW STEINER SCHOOL IN THE RUHR, GERMANY, p.36. ' 337 STUDIES AND LECTURE ROOMS FOR THE ARCHITECTURAL DEPARTMENT OP THE PARIS BEAUX-ARTS IN TEE GRAND PALAIS, p.41. 338 SUIT BAFFLES AT THE CO-OPERATIVE HOUSE, VASSAR COLLEGE, POUGHKEEPSIE, N.Y., p,42. 339 SUN BAFFLES AT THE LAGUNA INSTITUTE, CALAMBA, PHILIPPINES,p.44.- 340 EXPERIMENTAL PRIMARY SCHOOLS IN ARARAQUARA, BRAZIL, p.44. 341 SUSPENDED CEILING IN A BOYS'SCHOOL IN PORTO, p.45. 342 PARTITION WALL CONSTRUCTION AT DARTFORD TECHNICAL COLLEGE,p.46! 4\ t L .L... 4-. ASARCO ALV 0006385