Lynn has an excellent point. Any substance with a TLV of 0.05mg/m3 or lower requires a hepa (N, R or P100) filter. No N95s. Same for asbestos, although the TLV is in fibers/cc. And anything whatever that is expected to be present in the air over 5 times it's TLV can't be used with any of the masks. Monona
In a message dated 1/25/2011 6:01:00 PM Eastern Standard Time, paracelcusbombastusvon**At_Symbol_Here**JUNO.COM writes:
As several have noted the "mask" must be NIOSH approved N95 with a "TC" number on the mask. But, as Don noted, it still depends. What is the material being milled? If there is any potential the material could contain asbestos, glass fibers, ceramic fibers, or many other "hazardous materials" the mask must be a HEPA respirator.
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