Document Lorpe9nZLaBgXjGX7ooLKVj03

UNION ASBESTOS & RUBBER COMPANY INTEROFFICE CORRESPONDENCX . Ill ee: Mr* A* Hayes THIS DOCUMENT WAS NOT A RECORD <^8Ct* PPG INDUSTRIES, INC; DID NOT COME FROM IT'S FILES AND CANNOT BE AUTHENTICATED BY PPG INDUSTRIES, INC. NOTE; T1HS OOCUN^OT HID Dust CoNnOtrTolGOfvIE FSQiV I 'rVs ^i j*i^s Report on Midvest Safety Show May 4, 1950 There wmre tvo points of interest raised concerning asbestos: 1* 0*A. Sanders MD. stated that according to the latest research conducted by Arthur Vorwald, asbestos particles below 5 microns had no effect on animals; whereas fibrous material of about 35 microns caused asbestosis* The tentative conclusion might therefore be drawn that the real . danger does not lie in breathing the very fine dust, but in the larger, visible, particles* If this was correct, dust control would be very much simplified* (As a point of comparison the Prelininay Dust ; Survoy for tho Asbestos Textile Institute carried *. out by the Industrial Hygieno Foundation of America in Juno, 1947* otatas that 60 95 per cent of the *. * total dust seen in dust counting of most tertile * operations consists of non-fibrous particles, and ' .\e*:v1c that the U#S* Public Health Service relates the . incidonca of asbestosis to these non-fibrous .* ** . particles of siso ranging from one to fiTe or ton microns* This appears to bo in direct contradiction ' . to Dr* Sanders1 rmaarhs*) . 2* R. T* Pring strsosed the importance of periodic checks /?" and maintenance of dust control systems, particularly * . as for as the dust collecting equipment is concerned* ,VV