Document oM96k10ZEGMJex57w37jpy8ar

1. There are several types o anti-knockfluids containing tetraethyl lead, (1) avaition fluid, which contains only ethylene dibromide as the halogen carrier, (2) motor fluid, which contains ethylene dichloride in addition to ethylene dibromide and also certain other chlorinated compounds {it is a question ohaving a suitable proportion of available halogens, and in the automobile engine the temperature of operation ranges within limits which made it advisable to have some chloride present as well as bromide). In audition to these ingredients kerosene is used as a diluent just to the point which makes the proportion of tetraethyl lead constant in all of these fluids, so as to facilitate blending in gasoline to the correct level of concentration of tetraethyl lead per gallon of gasoline. The dyes used in the fluid and in the gasoline are many - red, blue, purple, orange and even brown - and are o^ed to differentiate specific brands and grades of fuel. 2. Modern gasolines are sufficiently different in their susceptibility to the addition of lead, from those of the late twenties and early thirties, that a much higher concentration than 3 ml. of tetraethyl lead per gallon could be employed to advantage. Aviation gasoline, ror example, may have up to 4.6 ml, and it couldhave much more. The present reasons for avoiding the increase are of a totally- different character, and right nowthe primary rea son is hygienic, although it is not necessary, and perhaps not advisable for you to so indicate. 3. The implication of the remark about the plants in the U. S. A. might be taken to mean that there are no manufacturing plants elsewhere. It might be well to make clear that this is not the case for there are plants in Great Britain, l-'jranee, and Italy. There are others in Russia and perhaps, but probably not, in certain of its satelite countries. A plant is also under construction in. Canada, K 0014903 November 30, 1955 Mr. Manfred Bowditch Bead Industries Association 420 Lexington Avenue New York City 17 Dear Manfred: First let me thankyou for the 0 copies of the Lead Poisoning Symposium. Our supply having been exhausted completely some time ago, these are a welcome contribution. I cannot hope to reply to or even to acknowledge receipt of your various communications, all of which are of use in informing me of the state of the nation in certain respects. However, I can reply to your letter of November 23 concerning the publication of Mr. Liegiield's paper. I appreciate your courtesy in raising the question, and I hasten to affirm your correctness in believing that I could have no objection to the publication of this useful paper. It occurs to me, however, that certain statements about "ETHYL"fluid and tetraethyl lead made in the paper were not up-todate or strictly true, and therefore I call specific attention to them by attaching that part of the paper y together with certain comments. 'Withkindest regards. Sincerely yours, RAK ef Enc, Robert A. Kehee, M. D. KE 00 ; *J1HV 4