Document rpekyn359NapvmboNk0vZkooG

mines Thndocument is produced by United States Gypsum Co.cany w the t2,,;:c.v..d Ins Corporation of Mercer ;--.r.-er::.V v. Ca` or.-ji Gypsum t'g.ret^ai, U/s.HW\i7fry~w..' t a>5`t<fe3-AC, imi documsflt i3:ut,;5:t!5itiop:o/.4;o.isof8 Protective Order enter.- j h nist cr.t ' * J0.7 18. 1585. as subsequent'.* <s.,.2.tdf I;; t: . Court to rue cd' this dosum-m. o'..- of fh.*> d^r^ni by arty person or *' Mtor.js sitU:Y p:phi{S(ttdr t*ctpl in scr.ordjnci wtlAutle terms ol iisit frofec^s Order." '. : - Cn,r*f.--y ir; . ----- y3----- prr-.-r, . -.'f .r.-arv *=n!y ?trues G*P5i*- ' ..." `t r r, ......... ' MZrf K, Waifc#r T- rsby:.` . i. - jstnCiv'-.-r ; 1. C; ,*151. F. StC<sr. S o*iws. rfie-lJ*,* ''* *<*t-5* j, aK'f*,*' .J,..._5*f. .Nei-iss. :J o::., r. TM8ri'2f.sV/ ` ""l -<\> i . . Jvw' -- - `! - Note <'l. -* J i CLERK U.S. DISTRICT COU3T E* xh/inbitrsl: p. Case No. S5-G322-CV-V 8- .- rn*5f. \: ` Th;:tiibp'omM-d i * i inilasl S-ts ^ss y0Jur" fl i : i t,. C*1 : i .... '! 'lAf'iCi'lhn *1,1 Md.Ccf ' > b'-pr-H. 0 ._cr ! . U S. f.'ist. Ll ~'~U- c5 lie imi dicp.nent iiru^iv't 1 > Huorovliioasofa Pro'.eutwe Orflgr Ci.rtrcd ia thul Wii : sobienuenfr ,,.seed l7 aocufnnni...U:-tf of this ^tumentj^jsyftgysg^g^^ -. t.itiiy ts strictly prohibited, except in accordwee witn the terms of that f'roleclire OrtftfvPORT Report Ho'. 25# 3 fctuld it nJr no. .i-asozrTrs* Date '5-I-S4 l^ >'! V) >] CONFIDENTIAL1" * 06407'!^M * .?7* r=>i* s\htru'etiy ,.i ui.t iimui oi Title: Attapulgus Clay In Competitive Joi-nt Compound* The purpose of this investigation v* to provide unambiguous proof for the presence or essence of attspulgus clay in competitive Joint compounds. The cemoetitive product* analysed ere listed in Table I. X-ray diffraction i* the most definitive analytical-method for identi*vjn attapulgua clay *inc crystalline minerals are 'fingerprinted' by the position and intensity of peak* in the x-rsy diffraction spectrum. Attapuicrus clsy peak a can not be observed in the diffraction pattern of dried joint compound because of the low clay concentration {!-**> and the masking of ateapulgite peaks by those of mica. The clay r-us* be separated from other joint compound components to obtain the best diffraction pattern. The seoaratif-n is accomplished by dispersing the clay in a colloidal suspension, .illovjno the non-clay component* to settle cut, and the- f lccculatirn* the Cloy colloid vith calcium hydroxide. The clav v*p dispersed when the carbonate filler was dissolved with hvdroehloric .acid. After allovinc the acid-insoluble eciids to settle out ovemi the colloitl.ii suspension was siphoned from the residue .nr* f loccul am- ` with Ca'nin,. The clay was recovered by centrilocation. An x-ray rfiffracticn'pnttern was taken of the air-dried product. Attapulaus clay is identified by observing characteristic peaks in ttx-ray diffraction spectra. The main attaculeite oeaks occur at lC.r, 4.5, 3.11 and 2,61 angstroms, with minor peaks at 5.42 ar.d f.-ia aryv-rr-s The latter two peaks are not subject to mica interference but are f!" observed in good quality spectra. Attapulgite identification was bar.'' ' on ebaervinn the main 10.5 anyatrom peak and one or more of the ctbo* peaks. The attapulgus clay peaks as veil as the nthsr acid ir*clublcomponents are presented in Tahie 2, Clay fractions from national and Raco gave very pure attapulgite spectra, while Welcc shoved cnlv two attanulnite peaks because of a large ksolinite content. The presence of asbestos fibers was checked with an ootical ricrcscr: HSOXl, and the presence of serpentine and amohibole asbestes tvoes vns ar.alyted by x-ray diffraction. The joint compound was wet-sieved _ thrown** a 325 mesh screen to concentrate possible asfcestcS fibers for easier detection. No asbestos fibers were observed in these competitive F.t-r'.rr. Acknowledgement: Appreciation is expressed to Mr. Jchn Hseih for performing the rarv x-r,v scans and asbestos analyses. i.m * Mipatfj }?i|$ in suuai UlfM aotiepjooos 11 Jrfaoxa 'pa;iq^ojcl F?L fy.lua jo uosjail -f? juaujnsop f p> ` ace3 jein ui pajgyaa JspiQ aAijoaj :-'j * jo .-.-aijiAOid agf 4} pajqns si (UOshwob <ft)j "g' 1$*:.^ UOi'i-.C, i{'3J -Jjjg3 SIjii' j I0>::03Ui!iiS07n '2J| ^ . - "ft__ _____ ia5S;jo s;fl. jfl pnjptd fOO:^i'ps>uO:jO-i ; ii|} uj ftsjjaog tiSM&y $SfC}$ p:(j{a;'j Sqpou.ij unJii jusuiaxp siqx | ijiiuf* ? <* i 1VI1H3QUN0D ttpjQ aAtimoJj Itqt |0 sum) am up ."uepjojse ui joaasj *piQititufil fcni/;s sj U<\vt jauosjad Sue Xq jusuinoop s-q} ja ;-n"nwar.:o3 siqj i:p.i .`ii'i oj jincj!; i) / * rspi'i1'^ Ajuan^jsqnj sie '58oi *8t - i a;eo jeqi uj p*:a;i aspiQ 8Aijr<s;oi[| C]o suqisiaojO q) inoajsnssi jusuinsop siu3v* ^ y1 `;eMo_-'fCp*.'1S!n.'s n :'<e '-o-.`iu.i:OA3`>eqD:ic:i * i-""**: }0 i.uqeiutiu') -.'it p" 0 'r1: rao S'U ut /-ut-.v:'- -..j mnsoX-j S8|sjc p35!iifJ ;-4 P^nmti si Juaum-iop: j t 33UOH ; A ill Ills lil T?:TT -T