Document mpep7qqB73Y8Eg2JboekazL1O

Memo to: From: Date: Dr. Kehoe Dr. Zavon December 19, 1962 At the recent meeting of the Threshold Limits Committee of the American Conference of Governmental Industrial Hygienists a number of materials presently on the list were assigned for rvaluation and a number of new materials were listed for which threshold limits were felt to be desirable. Among the materials listed were tetramethyl lead and tetra ethyl lead. I would appreciate very much any comment you might care to make regarding the threshold limit values for these two materials. Any references you might wish to refer me to would also be very much appreciated.