Document 2Re79bgB6QX3LDkKEdOwneeVb

/ * 33^0 THE DOW CHEMICAL COMPANY PLAINTIFF'S EXHIBIT PITTSBURG January 27, 1971 DOW-1061 ST0000868 Harold R. Hoyle ,, 1701 Bldg. Midland cc: D. H., Clegg, Pittsburg ASBESTOS Or. Leroy Balzer of University of California at Berkeley reported on recent conferences on asbestos at the December AIHA bimonthly workshop: 1) Ralph Nader recently testified before Congressional Committee on asbestos and toy balloons. 2) Great Britain has outlawed asbestos from approved insulation. t 3) Darlington Industries in England has Ca Silicr.te asbestos-free insulation. 4) San Francisco now has spray insulation regulations: 5 fiber/cc at breathing zone, 1 fiber/cc in general spray area, and 10C fibers/iiter outside protective drapes. Tests on background fibers give 0.2-1 fibers/iiter. Numbers set on very little data. 5} Power cutting of bound asbestos board gives significant . exposures. 6) Tremolite (coarse talc) contains significant amounts of asbestos. 7) Liquid implantation of fiber glass and almost any inert material can produce cancer in tissue, but none shown by inhalation studies. I discussed counting methods with him since we are counting at X63 instead of X400. He indicated no asbestos experience with lower magnifications but had experienced detection limits not too much changed with 10-fold change example from X10 to X100. Hi was interested in securing report on my asbestos survey. Under what circumstances would we release such information? L. Pitchforth, Jr. Industrial Hygiene meh