Document YrOKOeZ7L5mL7NDXaJX1vGV3V

FILE NAME: BF Goodrich (BFG) DATE: 1956June 15 DOC#: BFG007 DOCUMENT DESCRIPTION: Unpublished Internal Report June 15, 1956 R. Hylands D^SSO Bldg. 308-b On Jane 11, 1956 an industrial hygiene surrey as made of the Pigment 26 dust at packing operations in Bldg. 318-B, D/5579* I. ReeoBBendations 1. Dust at the cutting and bagging operations should be reduced to or below 20 million particles per cubic foot of air. II. Analytical Results Sample Wo. 1& k Million particles of dust per cu. foot of air 51 Remarks Worker's exposure cutting and weighing Hycar 1001 2&3 55 Worker's exposure bagging, dusting and closing bags IH. Comment 1. The recommended maxiarum allowable concentration of Pigment 26 (Soapstone) is 20 million particles of dust per cubic foot of air. The concentration found as more than twice this limit. 2. Workmen on this job indicated concern about "silica" in this dust, and the danger of silicosis. Pigment 26 contains no "free silica" (SiOg) which is the only chemical which can cause the specific lung disease silicosis. Evi dence does indicate that ta dusts of silicate minerals such as talc and soapstone, inhaled into the lungs over a long period of time, cause lung changes which are detectable uponX-ray. For this reason the maximum allow able concentration ia 20 million. 3* The manner in which the workman dusts the inside of bags Isaves much to be desired; pigment 26 is spilled on the floor, and becomes airborne when bags for rubber are "slapped" against the floor in the process of opening them. Foot traffic in the area also causes spilled pigment to become airborne. glw/Lm cc; H. Reel \ G. L. Wilson Dept, of Industrial Hygiene & Toxicology H '.'(Vic