Document dz6R9BqQen4oLeBgM75BEr66

L Lf INDUSTRIES To: Distribution Below INTER OFFICE CORRESPONDENCE Ddtt* February 26, 1974 1 com L. F. Sargert Location 20 North Subject: Attached is a revised statement (after talking to Messrs. Bell, Trunzo and Clapperton) which I feel we should send to our VDCM custcrrers. Please gritique this revised statement and send me your ccnments by Distribution: Z. G. Bell J. A. Clanperton W. B. Graybill G. J. Lazarchik J. Trunzo R. E. Widina A EV 6 i 70 SL 091921 PPG STATEMhT VINYLIDENE CHLORIDE Dract 2, 2/25/74 A concern for the possible hazard of exposure to virz'lidene chloride moncxner (VDCM) in the industrial environment has developed because of the recent events associated with vinyl chloride. There has boon little or no published information on the human toxicity of VDCM. in the past has reccirmended that the vapor concentration in the work area not exceed 25 pom as a tine-weighted average atmospheric concentration to avoid adverse effects on workmen. PPG new recommends consideration of a 10 cm (volume) threshold limit value (TLV) for VDCM as recommended for adoption by the most recent publication of the American Conference of Governmental Industrial Hygienists, TLV. Steps should be taken in both the manufacture and use of VDCM to prevent warker exposure to VDCM concentration in excess of 10 pom. PPG literature on VDCM is being revised to reflect this lower reccnmended exposure value. It is our understanding that the recommendation of the ACGIH or adoption of the lower value was based on a re-interpretation of previous unpublished animal studies. PPG will enable to keep you informed of any chanqe in the assessment of the toxicity of vinylidene chloride. If you have any questions concerning VDCM, please contact: Dr. I. G. Bell PPG Industries, Inc. One Gateway Center Pittsburgh', Pa. 15222 SL 091922 ppg state?-t: t . vr-r-.xiprME chlpr[pe Dract -2, 2/25/74 A concern for the possible hacart. of exposure to virvlidene chloride monomer (VDCM) in the industrial environment has developed because of the recent events associated with vinyl chloride. There has been little or no published information on the human tcxicity of VDCM. PG m the Dast has recamnended that the vapor concentration in the work area not exceed 25 rom as a time-weighted average atmospheric concentration to avoid adverse effects on workmen. PPG now recommends consideration of a 10 com (volume) threshold limit value (TLV) for VDCM as recamended for adoption by the most recent publication of the American Conference of Governmental Industrial Hygienists, TLV. Steps should be taken in both the manufacture and use of VDCM to orevent worker exposure to VDCM concentration in excess of 10 oom. PPG literature on VDCM is being revised to reflect this lower recommended exposure value. It is our understanding that the recommendation of the ACGIH or adoption of the lower value was based on a re-interpretation of previous unpublished animal studies. PPG will enable to keep you informed of any chanoe in the assessment of the toxicity of vinylidene chloride. If you have any cruestions concerning VDCM, please contact: Dr. I. G. Bell PPG Industries, Inc. One Gateway Center Pittsburah, Pa. 15222 SL 091922