Document k8XJO04vEb7RqoZ7r62e4BRO

FILE NAME: Talc (TALC) DATE: 1977 Feb 9 DOC#: TALC484 DOCUMENT DESCRIPTION: Letter to Kaiser Gypsum from Pfizer RE OSHA and Asbestos Standard 2-23-77 cc: R, H* Berbyv^-'' , R. J . Wiborn ^ , J .\ M K ^ R A iS , PIGMENTS & M E TA LS D fV S S lQ N o Pffflr tNC.,235c.^roHiST,NEW VORK.*.y. loan February 9, 1977 V- Mr. W.E, Oustbraan Kaiser Gypsum; 300 Lake-side Dr, Oakland, Cew 94604 7VUC Dear Hr, Ousjterman: ither haf t3een increasing interest in the subj-ect cjf talc, particularly with reoard to the exif:ent af its asbestos content? Since you are one of oujr many valued talc purchasers, we feel lO subject aWa*S f informtion on thL ocu5rrrreennttllyvaihais.i?ann effect ^an as^baelsttho,sAdsmtiannidsatrrdatwihoicnh (o.OrSsH-A) 2Cfsbestosaf i ^ i n ^ S "? be Bitfos^ to no more than cubic centimeter of air for an average, and to no more than 10 asbestos ,,bejrs per cubic centimeter at any time In October, 1975, OSHA proposed to lower i h f i S r timeweighted limit to 0,5 asbestos fibers per cc and 2jSy*J8: Very recently it has been reported that *-he National Institute for Occupational Safety and Health has recommended the respective permitted exposure levels be asbbesJtosaa ffi-bHeJjfrUs rptIe*rr cc' , t0 a * * fib e rs and1 ? 5 inrlnrtl Si^L'-i1975 PZ?PSl1' 0SHil d&fitlBB asbeStOS to cirysptile, ctoci.doli'te fcreinali t*** T2 h>h l U * J n$ actinolite, and prSSS? JStadnin fih 2" ^ e8e ^nerals. OSHA also defines an asbestos S 5S ll f?m Qf any f minerST di^Stir crifmicrcmJ ^ " ters, and has a maximum a ^ T S s t 3 to ^ cr0mete^9 and a length to width ratio of cr t-fS ij HAR121604-3746 2 3 8 i- T A lcl. establish" Ci0i?ge?S and tha ^ data to e n s u r e must be reducedaf UtiliT Pf???a s to hoia<3;flarine c the entire s u S e ^ but Place the-e wil l ' r o V ^ ^ "^ent deliberations tLe * CC the"S Wl1 coatlnua to be conaiderabla uncertainty. Naneyverttalheelwehsischit is prudent; for j youuurr* worftar.^ wt*il-.i-'v*ila using coirse.aactai.nnge- dauusstt 4vO sl.O evxltent 'paoasbseisbtl0eJ fMibmeUrns,r it^o. avoid dtusSt Scon^troil^eo.uiioyneti?anrslt^B . f '' ^w . rs" sQPiPraoprsiate,- be considered? a i H o v k ^ train??aspirat0rs.s^ l d also "ou will no.diubt wish review r. '. M S E S F F H T : s i t ` i K S :???r?," es i i 4 s s ? d io * Since we_have no control over the conditions of use of talc proaucts m your plant, it is not possible for us ^ s ^ - s s r s ^ ss?s r s r ' s l S t - S ^ ; S r S 1 - r " ^- 5 S S ' Pfizer research has develooed the most aecurqta -*1 sensitive method available'today of aralvz^ ? - , ^ 3 i e f on a;sbestfform mr-erals in method S?rac?io?eP^ d af ^ ng -~r^ diffraction, electron ' S * TM ? l< ty o U ta " S ^ 5!oS"L'5?S"L `S 1S r ' S 0*; cation methods in-use toda? .iLSdinr, L ? th?r identifi~ Sl*" n W*. t.1.1SeaSuvrMPi n ) HAR121S04-3746 2239