About your comment,
How do you know if the cartridge in the respirator is good? (et
in Thursday's list,
I don't understand how this refers to most of the respirators out
there in general circulation. I'm guessing it may well apply to those
intended for lead, VOC or other odor removals, in which the activated
carbon prefilters are expected to attract and absorb the oxides,
nitrates, alcohols or esters involved, but I'm hard pressed to
explain how VOC's like those you've mentioned would be diminished or
removed by standard spun-glass or polyester particle filters. Out of
curiosity: where on that site did you find the mention of this, and
what was the context in which it appeared?
Douglas Turet, G.J.
Lapidary Artist & Designer
P.O. Box 242
Avon, MA 02322-0242