Chris_Hamilton
Trying to be the best me, I can be
Sorry sounded like I had an attitude and that was most definitely not the case. I posted using my new phone, of which I'm still getting used too. That sentence was part of something that I was originally going to post earlier and it got automatically saved. I forgot to delete it before I posted what I did. Sorry for any misunderstanding.What I was suggesting is that if you just want the particulate protection for sanding and don't want to get the 603, use your expired cartridge to hold your new particulate filters.
The info I gave was told to me by a 3M rep that I know and trust. 24-48 hours of exposure to the atmosphere. I stand by that as being the standard. The 3M Rep you spoke to is in error as Iso's have no smell and you cannot tell when you are breathing them. If you start to smell something rest assured you have already gotten a large dose of Iso's. And their recommendation of a cartridge for isocyanate filtering is news to me. They specifically used to state that those masks were not adequate for Iso's. I will see if I can find the technical data on that. From what I have learned through I-Car classes and talking to various reps the only adequate protection against Iso's is a supplied air respirator.
Also keep in mind that if you are using these masks in a non booth environment you are already exceeding the Permissible Exposure Limit of the half masks and in many cases the full masks as well, which is 10X and 50X respectively.
I just don't want anyone to think they are "safe" when using one. You are "safer" but you are still being exposed.
Here is a 3M tech article on activated charcoal canister and how they work.
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