Ken,
I completely agree with Brian.
Even if the respirators were still stopping other baddies and just letting IPA through, this is still bad. I'm in a meeting right now, but I believe the TLV for IPA is 400 ppm, which is significant. So having it in a sealed mask - not good!
Any way this can be done in a fume hood? There are "walk-in" ones (not for actually being in during solvent/corrosice/toxic work).
Bev
RIM
----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Tue Jun 17 10:19:04 2008
Subject: Re: [TN] Respirator Cartridge for IPA
If the activated carbon filters on the masks are saturated, then they
are worse than useless. If the operators can smell the stuff, then they
must be saturated. A filter is generally quite small, typically
containing 30-40 g of carbon, which may adsorb, say, 5 g or so solvent.
I suggest that you find a scuba diver who will lend you his tanks!
Brian
Ken Bloomquist wrote:
> I have an unusual question for all you chemical types out there.
>
> We are doing some heavy cleaning with IPA and our organic vapor cartridges
> on the respirator masks don't seem to keep the smell of the IPA away from
> the operator. According to the different data sheets I've looked at say that
> an organic vapor cartridge should work.
>
> My question is can you still smell the fragrance of the IPA while having all
> the bad stuff trapped by an organic vapor cartridge? If so how would you
> know when the cartridge was saturated?
>
> Thanks,
>
> KennyB
>
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