Document MG3jd3vXqOx5kXqE8w4DdqOvx

DIVISION OF 8CM CORPORATION Fo r m 136 Pr in u o in U S A 4/71 FROM CITY ANSWERING LETTER OF SUBJECT G. L, Bechtel Cleveland 12/22/72 LEAD REMOVAL Last few formulas DATE December 28, 1972 FOR Mr. S. T. Bowell - DPJ Mr. E. B. Euchner - DPJ Mr. w. M. Tome - DPJ Mr. J. E. Southwick - DPJ Dr. H. J. Kiefer - UCB Prior to rendering a decision to you, upon your request for extension of the .06 requirement, we would like to know Just how retarded the drying cycle becomes with alternate dryer systems. You indicate that a combination of cobalt and zirconium at too high levels renders embrittlement in the finish film. Alternately, if you put in the cobalt and zirconium combination at lower levels, just how slow dry is the cycle? For instance, if in the 50 to 70 temperature range, would a person receive sufficient dry overnight to render a satisfactory film without degradation through moisture or damage by someone bumping into it, etc. We would appreciate your appraisal of the extension of the dry using these alternate systems. ( r\ ^ i it ( * >7 .01 C. C, IET D_r |\J C /W ( .1 W .o( Co. S of> -\ Urj. ilo.W/ ^ 7o rv o/nvl t (Krq) '< ( y O-Al t- iX V\f5 . i{O l ' G. VAT , ro o\ c. GLB/rjt (a. So GLD007127