Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Just a note on the mask vapor cartridges. Once opened, they are only good
for a certain number of hours. Check the package. I worked for a business
that used these, we got hit with an OSHA fine for not labeling the date on
the cartridge as to when it was first placed in use! The date helps to know
when to change the cartridge. On some cartridges, the active ingredients is
not just charcoal. So they have a life once opened. We were told the ones
we used were rated for the work we were doing, but had to be changed every
40 hours. OSHA told us every Monday morning, start with fresh cartridges.



Brian G.







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