Document 3Q4ymEx0x15Dwqqedo2e6JXd6

Mr. Harry Hyman General Office February 27, 1974 Lee B. Grant, M.D 14 North PPG Bulletin 120A Vinylidene Chloride Based on presently available toxicological Information, I would make the following recommendations: 1. The TLV should be 10 ppm with peak exposure at 25 ppm. 2. Delete present comparison of toxicity with ethylene dichloride, it should be compared with carbon tetrachloride. 3. Respiratory protection should be recommended when above standards are exceeded, either on TLV or peak exposure basis. Lee B. Grant, M.D. Medical Director LBGilC cc. Z. G. Bell L. F. Sargert R. C. Packard SL 091928