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Re: supplied air resperator

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Author  [Modern View]

11-16-2012 18:58:15

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If the intake connects to your belt you are breathing contaminated air. I have seen pictures of those worn by people applying herbicides. It might work more or less there, but I don't see how it can possibly work for isocyanates when you are surrounded by fumes containing iso's, even if it is feeding a charcoal mask. It would be very similar to a hose equipped supplied air unit with the blower/intake in the fumes.

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11-17-2012 10:33:06

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 Re: supplied air resperator in reply to CNKS, 11-16-2012 18:58:15  
The 3M unit has 3 large screw on filters and will work for paint. As 3M supplies manny different types of filters, I emailed a spec. sheet for the paint I am using and the replied as to filter needed. I will admit firters are a little expensive (3 @65.00 ea.) but no hoses.

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11-17-2012 12:02:33

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 Re: supplied air resperator in reply to BobinMi., 11-17-2012 10:33:06  
But, if you are using hardener, there is no filter that will keep isocyanates out, unless you keep a very rigid replacement schedule. I imagine they need to be changed after every use if they work then -- $$$. I trust nothing but supplied air. Read the fine print that comes with your filters.

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Rod (NH)

11-17-2012 17:17:58

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 Re: supplied air resperator in reply to CNKS, 11-17-2012 12:02:33  
I agree.

Just to add to the discussion:

3M does not recommend air filtration at all when the actual air concentration of contaminants is unknown. Filters can be used (per 3M) if 1) the correct ones are selected for isocyanates, 2) the actual concentration is known to be less than 10 times the occupational exposure limit for isocyanates, 3) a documented change schedule is followed and 4) fit testing is performed.

Of course any DIY painting outside of a professional, tested spray booth always involves unknown and highly variable concentrations of contaminants.

My opinion for DIYs - forget filtration for isocyanates. Get a supplied-air system and be done with it. Or stay away from hardeners and urethanes altogether.

Ref: 3M Respirator Selection Guide

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