Document gDDXV6BRz8JpY9BDZgOXMv1nL

FILE NAME Talc TALC DATE 1973 Oct 10 DOC TALC459 DOCUMENT DESCRIPTION Memo RE Strategy Meeting for FDA Talc Regulation W/o, Manville Internal Internal Internal Internal Internal Internal Caressor Caressor Cares or Caresor Caressor Caressor Caresor Caressor Caresor Caressor Caressor onc onc Caressor Caressor dd onoc nc onc Caressor W. C. Streib D Center - R. S. Lamar D Center Date October 10 1973 OCTOBER 8 FDA - TALC 1973 CTRATEGY REGULATION MEETING TP PUSACK the mentioned meeting the writer was assigned During F. L. Pundsack to be prepared to the responsibility Dr. with the FDA on the comment at our october 18-19 meeting statement Talc can be processed to remove all asbestos See Topics for Meeting with Dr. Alexander M. Schmidt on October 18 1973 by R. P. Carter assignment In follow to this detailed conversations Vice President Hazen Research were held with Art Lankenau Colorado Schooolf Mines Golden Colorado and W. T. Caneer Institute Bomt en ah re eminently well qualified obtained essentially Rtoesesaprecahk on this particular subject We the same story from both This is as follows only 1. Froth flotation is the industrial process that talc from associated asbestos will effectively separate minerals 2 Those asbestos minerals most commonly associated with talc are tremolite and chrysotile of some separation is possible the process is by 3 While Complete separation is impossible no means perfect low recoveries and high losses to achieve even at very in ic to less than 1 In order to reduce tremolite in the order 40-60 percent or higher percent losses This makes this type of separation may be required uneconomicfaolr most industrial talc uses at CSMRI on our own 2 talc which contains Work done at in its natural state between 5 and 10 percent tremolite that tremolite could be reduced to 0.5 to 1.0 per- showed recovery this purity cent by froth flotation Talc removal of tremolite level was 40-50 percent Complete appeared unattrac- was found to be impossible The process in tive and the project dropped With other tales higher tremolite content recoveries would be even lower , 000075 Page 2 -- October 10 1973 Only those talcs naturally low in asbestos content could . be expected to meet the FDA proposed test method and specification Here we are dependent upon the vagaries of nature difficult situation industrially R.SS ' CC A. Martinson EL EL H. R. EL W. L. EL EL G. E. G. W. F. J. R. P. F. L. Parker EL EL EL EL EL EL EL EL EL EL EL S. Speil | EL EL EL EL EL EL EL EL EL EL EL EL EL EL EL EL EL EL EL EL Center CRMC