Document gnBBE18xJDMLXjJbqzENBMZq

FILE NAME: Talc (TALC) DATE: 1976 Oct 29 DOC#: TALC479 DOCUMENT DESCRIPTION: Memo RE Pfizer Talc Samples I I Johns-ManvilJe Internal Correspondence To: R. Lamar - 3-05 From: E. M. Fenner - 1-06 Copies: G. R, Kinzer - ROD . . Date October 29 > 1976 Subject: PFIZER TALC SAMPLES Harold D. Stanley, Jr., Group Leader - Testing in the Minerals, Pigments and Metals Division of Pfizer called me today to report on their analysis results of the five talc samples you furnished them at the' end of their visit on Tuesday, . August 31. . Research ID No. Pfizer Code No. Total Tremolite RC-74340-3 .. CP 38-33 13-14 ; RC 74340-4 CP 20-30 . 3-4 : RC 74340-5 CP 14-35 . 7-8 . RC 74343-1 CP 38-33 10-11 RC 74343-2 ' . CP 14-35 . . 5-6 The total percentage of tremolite present in the samples was determined by x-ray diffraction, and included both fibrous and particulate material. ' The samples were also examined by transmission electron^ microscopy. The results of this analysis indicated that less than 0.1% was fibrous by the OSHA definition^ ^Mr, Stanley stated they were observing an average ol 7 fibers in 100 microscope fields-. . , '' . E M F :jh ASBESTOS IN JOHNS-MANVILLE PENHORWOOD TALC Samples of Johns-Manville Penhrwood talc have bean thoroughly{examined using electron microscope techniques. The minute ;quantity of. sub-micron asbestiform mineral found is not statistically significant according to the 'criteria emploj i by tiie U. S. Environmental Protection Agency, . . T 5 U. 1 L f? W 4/5TtVOlia'<i\ V J* aT CO o v a m i n o r l Vvt*" * -S/t W-4- Ai Jb, e*.<t> k *sf nii tsintl r\ci V V V v j-1J using the procedure specified by the Occupational Safety and Health Administration for determination of asbestos fibers. No fibers were detected by this method. . CRMC-HT-T ALC-000220