Document 4vmg9yywe1OZev2Gn0d71VO8a

FILE NAME: Talc (TALC) DATE: 1973 Oct 10 DOC#: TALC459 DOCUMENT DESCRIPTION: Memo RE Strategy Meeting for FDA Talc Regulation JoJirts-Mafivie W. C, Streib, R&D Center r . s. Lamar, R&D Center t , ? ^ a 5 ? : 's * j***, *> k ^ ^ * r i ?!. t l c - s :i ; o s * ; {/ w> J f * ' &{.-1 M *. * * * r : f ; ,* *, >- i i ' tu. October 10, 1973 OCTOBER 8, 1973 ''TRATEGY MEETING FDA - TALC REGULATION K During the n ? P r O T r c'tobei 18-19 .eting wi*th the TM ,. . 4. fpnir ran be processed to remove all asbestos* S e ? "Topics^for Meeting with Dr. Alexander M. Schmidt on October 18, 1973" by R. P. Carter). the same story from both. This is as follow . 1. Prnth flotation is the only industrial process that S i J f e c t i i S y separate talc from associated asbestos minerals. 2 . Those asbestos minerals most commonly associated with talc are tremolite and chrysotile, 3. While some separation is possible, the Process ^ g no means perfect. Complete separation i s / K h lotses to achieve even at very low recoveries and high losse in order to reduce tremolite m t~.-c to less than. . . Srcent, losses i'n the order of 40-60 percent or higher may be required. This makes this type of separation uneconomical for most industrial talc uses. Work done at CSMRI on our own G-2 talc, which contains between 5 and 10 percent tremolite in its natural^ t t /_ . showed that tremolite could be reduced to H P6 cent by froth flotation. Talc recovery at this level was 40-50 percent.lo'= ' T h f procesrippeared unattracin tremolite content recoveries would be even xower. CRMC-HT-TALC-000075 Page 2 W* C. Streib October 10, 1973 Only those talcs naturally low In asbestos content could be expected to meet the FDA proposed test method and specification. Here wd are dependent upon the vagaries of nature-- a difficult situation industrially* . R. S. Lamar rr cc; P. A. Martinson - 2 West H. R. Keefe. ~ 2 West W. L. VanDerbeek - 2 West G. E. Parker 5 West G. W. Wright 5 West F. J. Solon, Jr 1 West R. P. Carter 4 North F, L. Pundsack R&D Center S. Speil R&D Center CRMC-HT-TALC-000076