Document GKLoDYvMEzdYZkDgVNLvqQNG7

5C-I003 (*. 1-901 SHELL CHEMICAL COMPANY EfECCNCE wV - PRIVATE AND CONFIDENTIAL date SHELL' OfL* COMPANY TO CHEMICAL SALES - * Af<AGERt INDUSTRIAL HYGIENE 0#PM MESSRS, W, S. BAZARD, JR. WK.. CV,. LEORWOMRAENY ^uAaKuoTo9 19/4.' - D. P. JONES Kec'd R. C. SEDLAK `w ' SU8JCT MARCH 26, 1974' CHEMICAL INTERMEDIATES BUSINESS CENTER VINYL CHLORIDE TOXICITY Attached is a copy of a letter we plan to send to all Shell VCM cus tomers for your information. The -letter is a followup to our March 6, 1974' .letter on the same subject which promised a copy of our new analytical method for taking seven to eight hour samples of the ambient air in the vicinity of workers' breathing zones. Although the method is not intended for publication,! we are prepared, to make it available, to others who show an interest in the technique. r . /Ihg . K. W. Wood Attachment cc: w/attach. Messrs. R. L. Brunner H. L. Kusnetz R. L. Maycock COPY see 3-1049 SHELL CHEMICAL COMPANY A 01VISION Of SHELL OIL COMPANY ONE SHELL PLAZA P.O. SOX 2463 HOUSTON, TEXAS 77001 `' " March 25, 1974* > i; Gentlemen: In our letter of March 6, .19741 we indicated that the use of employee breathing'zone samples has assisted us materially in minimizing vinyl chloride monomer exposures. Attached is a copy of our analytical method describing procedures for taking average samples of ambient air in a worker's breathing zone, which you may find of interest and assistance. Should there be any questions regarding the details of this method, please direct them to: Mr. Richard E. Dilgren Manager Analytical Shell Chemical Company Deer Park, Texas 77536 Phone (713) 479-2331 Ext. 3134' Yours very truly,: SHELL CHEMICAL COMPANY Attachment K.u), u)<hl For: R. J. Reynolds Manager, Chemical Intermediate Business Center - see 3-1050 At.' .V ' t SHELL' chemical company V* A DIVISION OF SHELL OIL COMPANY ONE SHELL PLAZA HOUSTON, TEXAS 77002 ` OI'V<yp\/C- Kyi* 5 Gentlemen: The necessity for limiting and controlling human exposure to high concentrations of vinyl chlpride has been long recognized by industry. A 500 ppm ceiling value is specified by the Department of Labor, under the Occupational Safety and Health Act, as the permitted employee exposure level to vinyl chloride. The most recent Manufacturing Chemists Association safety data sheet for vinyl chloride reports this value. A copy of this data sheet is enclosed for your information. In June of 1972, the American Conference of Governmental Industrial Hygienists (ACGIH) adopted an eight hour time weighted average Threshold Limit Value (TLV) of 200 ppm (vol/vol) for vinyl chloride. Documentation covering the considerations leading to the adoption of this value may be obtained by request to the Chairman, TLV Committee, American Conference of Governmental Industrial Hygienists, P. 0. Box 1937, Cincinnati, Ohio 45201. While the ACGIH adopted a 200 ppm level for vinyl chloride, the TLV Documentation cites studies which recommend levels from 50 ppm to 500 ppm. As you may be aware, the Manufacturing Chemists Association has contracted with independent consultants, on behalf of a group of vinyl chloride producers and consumers to conduct animal exposure studies and a comprehensive epidemiology study of vinyl chloride workers. It is hoped that results from these studies will aid in clarifying what exposure limitation would be most appropriate. However, until these results are available and in view of the range in recommendations, we considered it prudent in our operations to establish a vinyl chloride TLV of 50 ppm; further, measurements indicate that this is a feasible level for us. We urge you to give consideration to the vinyl chloride exposure levels which may be appropriate for your operations. sec 3-1051 We would be pleased to make available our techniques for measuring low concentrations of vinyl chloride if you would consider them helpful. Very truly yours, SHELL CHEMICAL COMPANY 1 Attafhment: i R. 0. Reynolds Manager, Vinyl Chloride Business Center MCA Safety Data Sheet SD-56 (1972 Version) 4~o f/ooL(et~ G p" Ccr^cQ-^U <JL^ PPG p( r'esfou-e. / K M Q. \ Rrte* C pe'Ad/eoj- C f^ see 3-1052