Document 82MwLayEqBVQKBQe6N89kBe7e

FILE NAME: US Gypsum (USG) DATE: November 1, 1966 DOC#: USG072 DOCUMENT DESCRIPTION: 1966 Progress Report from USG Research Center re asbestos substitute v/cr:< was started to investigate suestitutes asbestos i.*v joint _____ The first series was xa.ce witr. very fine"?! (Cao-0-2ii M-5, Cabot Cert.) in a nor.-casein all-purpose cccpcurc An air-floated slay (Txcello, Thorpsen-vieinrar.) was also used in eases the experirental ccrpounds felt heavy initially, then brc*cs down to give a softer, smoother spread 'out also core sendees*/ to flow and to wipe off the board. The test results fsr the first series, AP-291A-2, shewed that tha siliea would have to be used at less than the - c t > levels tried. The A?-293A-D series, containing the silisa at 1-355 level, also snowed sharasteristics of heaviness, stickiness and encessiva :r. tne favorable side, e es? e--t>o9u!n!-o. centS 4 --4 *.5 3 5 silisa did hava a ssfter, scsotner feel after its viscosity breakdown under tne rowel* The A2292A-3 series shewed that a ssllcidal grade of attatulru3 clay (Attagel CO, Minerals and Checisals Philip? Cert.) was net suscessful as a direct replacecsnt for asbestos in a nor.-casein all-purpose cocpound. Use of ths slay at Q.5-*+S of -* forcula gave' lev; consistency serpeurds which cixed well but had heavy, z z stick/ troviel application properties and tenced to flow or. trowel. The cccpcur.ds had geed bend to tape and f`air cnec.< crac.resistance. This in v e s tig a tio n w i ll be continued as knowledge of other poten: ascTs to y -sub s titu te s is cisccveredT i t seers possible tnat r.o~ s: - y -a--! x-ri-ll- ' V r-a recu ireesn ts and that ccctin aticn s of cate r i a l s such as described in th is report w sli bs .ss-ls-u .1 r e t : asbestos. A replaoecent for asbestos in Joint eocpour.ds is desirable becau: .M a n ata bh* present cocpleta deper.cer.ee on tnis raw raterial, tr.er is a ccsslollity that asbestos ray be ' declared a. haardoua raterial ana ito use arenitit-sc , elir.lr.ata d . or severely licitad. As an etnicax proposition, if ascestc3~T3 : fjet ~Har*'*aetig en 'w-- n neaj.cn - ShSUis os replaced In spite or its unioue and valasle oroaertias. PLAINTIFF'S EXHIBIT > 0 UO. >'U `K ^ L