Document jmE7yXzQVDayK00kKoz7bg3aR

New York University Department of Chemistry 4 Washington Place, Room 410 New York, N.Y. 10003 Telephone; (212) 598-3427 X/0C > Mr. George J. Dippoid Whittaker, Clark and Daniels, Inc. 100 Cooiidgo Street South Plainfield, New Jersey 07080 September 30, 1972 Dear Mr. Dippoid: The analysis of the four most recent talc samples you have sent me has Just beer; completed^ with-the following results: Sample Talc Chlorite a-Quartz Dolomite Calcite No. 2450, Lot #7390 77# 15# n.d. 8# n.d. No. 46o8, Lot #821708 70# 5# 2# 3# 20# No. I6I5, Lot #921015^ 77# 12# 7# 2# n.d. No. 141, Lot #82172 100# n.d. n .d . n.d. n.d. / Sample No. 4608, Lot #831708 in the tabulation above showed some suspicious features in Its x-ray diffraction pattern that might have been due to the presence of chrysotile. Therefore, this specimen was subjected to detailed examination by optical microscopy, and no chrysotile was found. Sample No. 1615 Lot #921015 in the above tabulation showed some features in its x-ray pattern that suggested that it might contain some tremollte. Accordingly, this specimen was subjected the detailed microscopic examination. Both tremolite and chrysotile fibers were found to be present in this sample. It is estimated that the tremolite content is about 2# by weight, and the chrysotile about 0*5#. The protocol described above is that which the PDA is tentatively considering as their official testing procedure. That Is, the talc is to be tested first by the continuous-scan x-ray diffraction method, and if nothing suspicious is observed in the pattern, it is considered acceptable. If there are any suspicious features, the talc is then to be examined by optical microscopy, to determine whether there are significant numbers of fibers visible which have the refractive indexes of the asbestos minerals. Please note that the asbestos content of Talc No. 1615, Lot #921015 is just at the minimum level of detectability. It is evident that if this lot is blended with, e.g., Talc No. 141, Lo t #82172, in the proportion of 1 part of the former to 2 parts of the latter, the resulting mixture will be fully acceptable by the analytical protocol described above. i EXHIBIT 1 WCD-10 1 FH&UMJi EXHIBIT NO__ a_L_ t-iuy s "ALC A N A L Y S IS (AS CCS TOG) PRODUCT NUMBER PRODUCT OHIO IN COD h IDENTIC 1C'A T IUN PRODUCT LOT NO. WORK PtTTORM ru RY INVOICE NO. <? 9 / O /j X-RAY DIFFRACTION ANALYSIS (PERCENT) TREMOLO" E ^ CHYSQTILE OfJ ALPHA Q U A P <7 7 CHLORITE d o lo m ite /X MAG NFS ITE NO ROM -O F ' O . O l ! i 7x7*/CURVE PILED IN ! OLDER NO.