Document gbmBYzk4zZ7Yvx8on2Bga9gDL

FILE NAME Painters and Allied Trades PAINT DATE 1973 DOC PAINT107 DOCUMENT DESCRIPTION DuPont Tests of Exposure from Sanding Preparakote Primer RE OSHA Asbestos Regs from NY Talc in the Primer 3310 REV 7-66 QU POND && ESTABLISHED NOS NOS ESTABLISHED E. I. DU PONT DE NEMOURS & COMPANY FABRICS & FINISHES DEPARTMENT - an * CC R. S. Diem Mar. Lab E. E. SWAIN JR 2373 WILMINGTON Marshall R & D Laboratory April 4 1973 LINE PREPARAKOT Efi SANDING DUST Attached is a summary of the experiments I performed to determine the amount of airborne asbestos in sanding dust from Line Preparakotefi The level in general is within 1976 OSHA standards for asbestos 2 fibers longer than 5 microns - time weighted average Unanswered still are The amounotf encapsulated asbestos in the respirabla dus The effect of the encapsulated asbestos on the lung tissue I do not know how to determine the amount encapsulated - one guess 177 would put the maximum as the proportion of talc and asbestos in the paint solids However the amount is going to be less than that since we do not count fibers less than 5 microns in length and a significant portion of the respirable dust would be less than 5 microns in diameter If we can be of further help please contact me TJN 4/4/73 ATTACH PROCESS CHEMISTRY SECTION MANUFACTURING SUPPORT GROUP Terms Kiten Terms KitenKiten THOMAS J. NELSON & SE MEANS Safety- Safety- FIRST & FOREMOST DBY0011145 SUMMARY SANDING SAMPLES # - Taken af refinish training center while operator sanding fender _ Asbestos 519 2.3 fibers 7 fibers fields 2 - Taken while sanding panels laying flat on bench top Filter was 6 inches to the side and 2 inches up from bench 80 of dust particles flowed below filter Asbestos - 1.6 fibers 2 fibers fields 3 4 Taken while sanding on bench top Filter 3-4 inches above sander Asbestos - 3.2 fibers 3 fibers fields NOTE 1976 OSHA limit is 2 fibers in sample # 1-6 1-6 hours sanding at this level would meet the 2 fiber limit and 3 - hours Sample 3 was probably higher in dust than operator would receive since the sample was close to source In both cases - sanding for longer than 5 hours would be unlikely in a refinish shop DBY0011146