Document x5oLVKx10BQZda9QRvxO853Gy

June 16, 1972 Herbert Blumenthal, Ph. D. Deputy Director, Division of Toxicology Bureau of Foods Food and Drug Administration 200 C Street, S.W. Washington, D. C. 20204 . Dear Dr. Blumenthal! We have provided you in the past copies of animal toxicity studies on three primary PCB's, i.e., Aroclor 1242, Aroclor 1254, and ArocloR 1260. ^ Industrial Bio-Test Laboratories has completed or has underway Btudies on additional related products. To date we have re ceived the following reports: 90-Day Feeding Studies in Rats and 90-Day Feeding Studies in Beagle Dogs on: Aroclor 1221 (monochlorobiphenyl) MCS 1016 (a modification of Aroclor 1242) Aroclor 5432 (32# polychlorinated terphenyl) Aroclor 5442 (42# chlorinated terphenyl) I hope you will find the data in these reportB of Interest. Sincerely, Elmer P. Wheeler Mgr., Environmental Health Medical Department EPW/bks Enclosures cc: Dr. J. c. Calandra DSW 019827 STLCOPCB4007760