Document e7QmxqYYNYzqE59mokVbQGG29

FILE NAME: Kaiser Gypsum (KG) DATE: 1977 Feb 7 DOC#: KG089 DOCUMENT DESCRIPTION: Letter to Kaiser Gypsum 2-23-77 cc; R, H. B e r , R- J . W/bom ' M A R A I S , P t G M E N T S & M E T A 1.S DJViSIOIM o PPlIfRINC.,235C,42NUST,NEW YORK,N.y.li>oi, February 9, L377 to. Vi.E. Or Kaiser Gyr 300 Lakes C/s- Oakland T/U-C u Dear i^r In reeeiw the subjt nature' ai are one o you should )G subject. $ interest in gard to the . Since you s, we feel ion on this The Occupation, currently has; stration (QSHA) scribes that je: _______ ard which pre- 2 o ia.sb e stro~~s -f iTb?eyr.s per cubic - _ ______ no more than centimeter of air for-an aVerage' and to m more than 10 asbestos Coheirs per cubic centimeter at any time rn October, 1975, OSHA proposed to lower the ^ u r 'timn weighted limit to 0.5 asbestos fibers per c i per " for ay s i 4 a `ot o S a i 15 S; J rpcentiy ifc 5135 been reported that the IOr Occupational Safety and Health has recommended the respective permitted exposure laval-Th* asbestos^'fibejrs^er^cc,t0 `1 asbestos fibars a"d 0.5 S g S ; 3 S ^ j i f ,i 5 a i r f c ^ g i ,,5 4 S i 2 " to aannythophytlhleistee?tnainndo raacitsincl,,icf,,c.e', and , every " orod-miproaact containing -,t ,, tnesa in-inerals. OSHA also defines an asbestos ^ fiber as a paarticulate form of any of these minerals A-^I5||e r . S micrometers, and has a maximum a at least f t a ^ cr0IRetara and a le*?th to width ratio of 3 \ h$i li H A R1 21604-3745 22.38 .fi7f- ... 0^ TAL c ^ u S ? i o n a i 0L p S u f r t r a ^ b ^ I o ^ i s fj ;h& "tandarf for its several oomerdni io^s ha" ! that asbG5tos' in the production of net only a s h ^ M . e n associated with cancers and Mlignancils.* BocauS ^ a variety of factors, including the vari^bilir-i - 5 many unknown response to ckretnoe^s f ln<3j-vidual establish a shfe S ? nsfa'^ al5Seno* o da-a to ' exposure proposes must he to hold A T reduc^dL\o^a?Cl*ded.,that feasible, emPlyee osha until those hearings .,,f e ,3 eciulre subject, but place there will continue to^be'^cT' dlii!^ atians take Je to bG cnstaerable uncertainty S ' ; " " L ^ hf ? ? ' = '' . H e usl,,5 , S 2 .;" ss* t m i o n s under orku, condition/"^ : ' ''' d"st ?noendust control equionen^ or n T T l WherG appropriate, be considered, and works'" train? ^esplrat0r should also *ou will no, aejubt wish to r~tfiew lmPletr`e-Tlfced- of the OSHA standard for o u p a * i TM 3 3UB pr0vision* ^ 9 Code of Federal BaguiatioL'lti^looi?5^ asbestos posed amendments which appeared in < T i ^ d the P-" issue of the Federal Register?' ^ October 9, 1975 3% SS ^ <* to indicate the airbcrL ? i b e r c o n c e l L ^ f c n ^ , 'u US could possibly result from your usa of'+S *lllch we can provide information on t h e M h f J r f i however, content of the tales we npp?y? asfcestlfor1 mineral r&seaxc-h has devalotjpr* f-ho sensitive mefchjcd available'todnv nf A acchra'te c.d ' asbestos and a s b e s t i f o r m ^ r a L - n f based on step scanning x-raJ , ^ 1* 'Tbis method, diffraction, and ti;a n L ^ I f L ^ rfCtln i electro* permits identification of' t r u e ' S S i ^ a ^ 0^ ' levels of 0,54 and fibrous * le asbesjtos at at levels as low as'0.14 in th= taicS/ vUChJ-^S tret51olite, cation methods in-use todav f No ?thar identifi- and scanning electron microscosv _?tlcal microscopy as direct, oscopy, au_e as sensitive and H A R 121604-3746 ` 2239 r -3 - TAL c Pfizer routinely monitors its' talc production using this sensitive methodology. Based an many months of evaluation we can state that: ~ valuation, The California CP talcs which you purchase normally contain between.1% and Sa total tremolito with a fiber content of l e s s than 0.1% by weight (the practical detection i if f ii t of the analytical method). ffa believe that.it is in your bast interests ar.d ours that information or. this subject be brought to your attention. We trust you wi t^ s useful* and that you will follow the OSfirt. hearings and other developments as they occur. Ke will continue to monitor these*hearings and try to keep you aware o^significant developments, If you have any questions, please do not hesitate to contact us. r Very truly yours, dPBrsp _ /f P b/r) S ie s t a w - 7 a i c s*yyc-/i~ 7 u F ftr / fA T u o t t f , -- r-- 1" >ft^ 1>V^LpOigfose 2 , S' 3 % X, ?<Sa w 2 , 1 / % r 3 o a T//>*i = ovt=t*.Th~ 2 2 . ^ 7 . x: t/*j, - 3 fvKfoS-i? 9 rf #7*, Z 'l* T //t?4 , i iop 7/tic i I 4f4*. J HAR121604-3747 ' 2240