Document n96Ng8mk16bjQYqGY5w75m9qX

TO: C. Roach UBJu^T: Marv. Schmidt Fibrous Talc vs Asbestos J. N. Walker. ' May 1, 1972 Paragraph 103 of the 11-30-71 Notice of the Illinois Pollution Control Board asbestos is defined as "Any fiber or' any mixture containing fiber of hydrated silicate mineral, which, on the basis of its crystalline structure, falls into one of two categories: . (1) pyroxene - chrysotile fiber (2) amphiboles - crocidolite, amosite, tremolite, actinollte or anthophilite fiber." As you are well aware, fibrous talcs obtain their fibrous nature from actinolites and tremolites present. ' The 1971 ACGIH tables of TLV`s state (on page 29) that "Talc, (fibrous) - use asbestos limit." . ^For these reasons I believe that vie should consult our attorneys (" before any product containing fibrous talc be offered for sale. MS: ml VrU United States Gypsum Company o "O o