The effects of milling on diameters and lengths of fibrous glass and chrysotile asbestos fibers.

An investigation on the ffects of milling on diameters and lengths of fibrous glass and chrysotile asbestos was performed. A wool type fibrous glass and chrysotile asbestos were ball milled, one at a time, for selected periods of time. After each milling time a sample was taken by using a special technique to obtain representative samples. The samples from all milling times were analyzed by phase contrast microscopy with a Zeiss phase contrast objective at a total magnification of 625 X. Selected samples were observed and photographed in a Phillips EM 200 electron miscroscope. The results of examination by phase contrast microscopy showed that milling had no significant effect on diameters of fibrous glass fibers, but reduced the lengths of these fibers and reduced both diameters and lengths of chrysotile asbestos...