Document 7Mp2mdn21xJb6xGLzMme8pNeo

EXH.__ WITNESS SMtCMOM CMtlwaw 'OOl.JOi TO: Zonolite Region-' Managc-ne - R. L. Asher (3) C. R. Lowe (6) V. X. Rogers (7) T. F. Egan (8) C. H. Weudtsl (7) OATH: January 6, 1973 FROM: T. P. Feie SUB.IICT: MONOKOIE 5 J. V. McKajjue (15) R. B. Moran (5) A. S. Webster (2) J. B. Robinson (3) L. X. Irvine (3) J. H. Greer (3) R. M. Vining B. R. Williams J. L. Wright 11. C. Buecicer I. Odler A. M. Rosenberg P. E. Korenberg H. A. Brown Gentlemen: Enclosed are: (1) CL Report R43."9-37, dated November 16, 1972 "Acceptability of Type MK5 Cenuntitious Mixture in Existing Fire Resistance Ratings" aua (2) October 1972 Bulletin "Zcr.elite Announces MCWCOKOTE 5, The Irup roved As;-as J os-Free M-.ster-Typc Fiveprcofi-;' Material" along with draft of cover letter (dated October 22, 1972) accompanying the Bulletin- The UL Report "approves" MK5 frr every CL design new presently approved with MR3 - except for those variations of tested ssseci-liss as noted on the bottom u page T2-5 (assemblies utilising steel float units where MK3 is approver; in crtMr.iitior.s of fluted and cellular deck in which the ratio of cellular to fluted sections exceeds 50 percent). * The KK5 announcement has been made in the Eastern and Mid-Vast Regions only - where asbestos containing fireproofing materials have already been banned. There is at this tine no schedule set for introducing MK5 into any other area until ve have completed all field testing and/or EPA action. Limited copies of the Report and announcement arc being provided for your information and in ihe event of inquiries. cr,fly Thomas P. Fcit TPF/jaj Enclosures