Document wD7RdjyrZd7yRRdwe9RvY8eO6

r` / Cnc- / UNION CARBIDE CHEMICALS AND PLASTICS P-O. BOX *004, SOUTH CHARLESTON. W. VA. 2S303 . Mr. W. E. Nichols Organization Resources Counselors, .1625 I Street, N. W. Washington, D. C. 20006 Inc. Subject: Probability of Vinyl Chloride Monomer Emissions for Various Types of Resins During Fabricating Dear Mr. Nichols: The probability of vinyl chloride monomer emissions for various types of resins during fabrication operation varies with the resin type and with the mode of fabrication. The various types of PVC resins in U. S. Commerce and the relative content of re sidual monomer, is as follows: Resin Process Suspension Bulk (PSG) Nonsolvent (UCC) Dispersion (Paste) Solvent (UCC) Resin Type Copolymer Homopolymer Homopolymer Homopolymer Homopolymer Copolymer Relative VCM Content 2,000 1,000 1,000 10 2 1 Please realize that we are discussing the resins of ten years ago, not material produced today. Suspension, bulk (PSG) and nonsolvent resins are all calendered, extruded and molded. Calendering operations are most likely to yield high emissions particularly in the raw material area. Manufacture of coatings, cloth coatings and foams from dispersion, nonsolvent and solvent resins yield very little exposure. UCC 004722 / / / Letter to Mr. H. E. Nichols March ^28, 1977 Page Two Record pressing (molding) has in the past been quite high. ,/ , Finishing and packaging^ operations are likely to yield no expo sure1^ for any resins or fabricating operations. This is short but should be quite adequate for your purposes. Very truly yours. R. N. Wheeler, Jr / / RNWJr./pm UCC 004723