Document 3Je5vqqMONL89QJaaBLnRoYM0

Mr. n. F. Robertson Bakelite Company New York Mr. V. J. Houaka (2) Dr. H. F. Smyth, Jr. July 17, 1956 Extraction Teata on Rigid Vinyl Compounds Dear Mr. Robertsons Tiihwamnk yjovua f*or raevferring Mr.w Houaka'e *let*t^er t*o me---^ * I have often wondered how effective an overlay of an accept able vinyl film on an unacceptable one would be as a barrier. The Food and Drug Administration considers compounds of selenium, cadmium, lead, barium, boron, antimony* and mer cury too toxic for use where food contact la concerned. At present Dr. Lehman and hla associates might consider 0.01 or 0.02 parts per million to be negligible. At the same time they would expect a teat for sensitivity of the respective material in that category. This represents a difficult re quirement to meet. Nr. Houaka does not indicate how much cadmium and barium was present in the test solutions themselves, but con trol analyses were made on these solutions. Since the analytical methods to which Wr. Houaka refers are not within the limits mentioned above, there would be no advantage of presenting this information to Dr. Lehman at this time. X am referring Mr. Houska'a letter to Henry Ssyth Very truly yours. MEDICAL DIRECTOR ucc 063688 ueetiD To (Nam) Company location Copy to FOR INTERNAL CORRESPONDENCE BAKELITE COMPANY UCC 30 EAST 42nd STREET, NEW YORK 17, NEW YORK Dr. T. W. Nale Industrial Medical and Toxicolo- Department Room 203-300 Madison ** 16, 1956 Originating d,pi. New Product Engineering Aiuworlng Uttar data subjact Extraction lasts on Rigid Vinyl Compounds Dear Dr. Nale: Sometime ago Mr. L. L. Carpenter of our Bound Brook laboratory suggested that one way of overcoming the problem of extraction of undesirable materials from vinyl compounds would be to overlay an unacceptable material with one that was acceptable. Some -work has been done along this line using barium and cadmium stabilisers In the base stock which is then overlaid with a mate rial -which is presumably acceptable. Although the extraction tests are not conclusive, they show within the limits of sensitivity of the analytical methods that less than 1 pp*n of barium and less than .5 ppm of cadmium are extracted* We would be glad to have your opinion as to whether or not the results obtained to date justify approaching the Food and Drug Administration in the matter or alternately, if you feel that further work should be done before this is undertaken. A copy of Mr. Houska* s letter of June 12th is attached. Tours very truly. HFRobertsonj mom AtU UCC ,,r.t ,, 063689 ! * RECEIVED * i j II!' 1/ '^56 INDUSTRIAL MEDICAL t TOXKSiOGY DEPARTMENT :