Document jE3apDGpo6ZypgrJJnjpBZb5

FILE NAME DuPont DUP DATE 0000 DOC DUP309 DOCUMENT DESCRIPTION Exhibit D - DuPont Supplemental Responses to Standard Interrogatories 5310 REV 7 48 E. I. DU PONT DE NEMOURS & COMPANY INCORPORATED FABRICS & FINISHES DEPARTMENT -* an CC R. 5. 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 } 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 respirable dust The effect of the encapsulated asbestos on the lung tissue do not know how to determine the amount encapsulated - one guess - 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 Team Plasten Team Plasten Plasten THOMAS J. NELSON & Means Safety Fit & Formmosr DBY0011145 SUMMARY SANDING SAMPLES A # - Taken of refinish training center while operator sanding fender Asbestos -2.3 -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 bench 80 of dust particles flowed below filter . Asbestos - 1.6 fibers 2 fibers fields 3 - 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 # - 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