CAM-296 T ALe AND PYROPHYLLITE By Robert L.

DEC 1982 Raymond d.

Q , M il P a W - i ' . -- b P A fcj&fi (p/wtf bZG.

waiter c. me crone associates, Inc, CONSULTING: ULTRAMICROANALYSIS MICROSCOPY SMALL PARTICLE PROBLEMS SOLID-STATE CHEMISTRY 16 March 1981 Mr.

CAM-293 Talc and Pyrophyllite By Robert L.

Cyprus In du stria l M inerals Com pany Interoffice Correspondence To From E.P.

ROALO H.

Talc and P yrophyllite B y Robert L.

DEPARTMENT OF HEALTH & HUMAN SERVICES 8 FEB 1983 Public Heaitn Service Foo and Drug A dm inistration W ashington DC 2 0 2 0 4 Joan M.

Respir Evaluation of respiratory effects in miners and millersBritish Journal of Industrial Medicine 1982;39:233-238 mental New exposed to talc free of asbestos and silica iratory D H W EGM AN, J M PETERS,* M A R YANNE G B O U N D Y ,t A N D T J SMITH iAnmfirJe FHreoamlththSeciOenccceusp,aHtiaonvaarldHSecahltohoPl orofgPraumbl,icDHeepaalrtthm, eBnotsotofnP,hMysaisoslaocghyu, saenttds t0h2e1D15e,paUrStmAent o f Environmental iscianinNei. kHeerasl.th2 nmromDiies .dhermonioicl unities. r>euprruisnee.

^ nCAmEXMTH-IBI2FIT7F3 ^ KH!

7881 Calculation of Number asbestos fibers per oz U0654 # fibers counted 1 EFA mm2 1256 #GO 10 GO Area mm2 0.013 Vol Filt ml 1 Dry Wt grams 0.0959 Dry Wt oz* 0.0033828 U0655 4 1256 10 0.013 1 0.081 0.002857 Asb. fibers/oz Asb. fibers/oz 2.86E+08 286 Million 1.35E+09 1.4 Billion U1986 3 1256 10 0.013 0.1 0.20567 0.007255 4.00E+09 4.0 Billion * 28.34952 grams per oz EQUATION: Number fibers per oz of talc = (# fibers-cted*EFA*100ml)/(#GO*GO Area*Vol filted*Dry wt) EFA= Effective Area of the filter GO = Grid Opening 95% Conf Values based on ASTM Standard Method D6281-98 All 3 samples pass Chi-Squared test of section A6.2 of D6281 Upper and Lower 95% Confidence Values determined from Table A6.1 of D6281 Asb. fibers/oz F/oz Upper Value F/oz Lower Value U0654 286 Million 1.6 Billion 7 Million U0655 ______ 1A_ Billion 3.5 Billion 369 Million U1986 4.0 Billion 12 Billion 820 Million.

TALC AND PYROPHYLLITE By Robert L.

ENCLOSURE 1 Not subject to the requirements . of Section 3507, Paperwork Reduction Act of 1980.

PLAINTIFFS EXHIBIT WCD-217 304 571 FEDERAL SUPPLEMENT physically strong, hard-laboring individual had not suffered in his pre-ailment life, without physical pains, incapacities or pres sures, and without dependency upon both his wife and children.