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  #31 (permalink)  
Old 09-11-2019, 01:21 PM
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Quote:
Originally Posted by dwighty390 View Post
You're right, 3M doesn't specifically call out iso's.

Iso's DO have a smell, however.

Paint smells. Isocyanates do not. Matt is correct.

John

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Old 09-11-2019, 01:24 PM
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No way. Iso's are what give the sweet smell.

3M does actually mention that one, interestingly.

https://multimedia.3m.com/mws/media/...techupdate.pdf
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Old 09-11-2019, 01:26 PM
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Interestingly, this document alludes to what a lot of people say about the charcoal filters for iso's: They work but since they aren't idiot-proof, no company will advertise it as such (they get saturated and become ineffective).
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Old 09-11-2019, 01:39 PM
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There will be NO ODOR until you are already over exposed. From your own document you posted.

"The odour threshold for isocyanates, i.e. the level at which an individual can smell an isocyanate, is typically higher than the allowed exposure limits. In other words, if a painter smells the sweet, fruity, pungent odour of an isocyanate, they are probably already overexposed. "

This subject is way to important to be splitting hairs on odor. The bottom line is you CAN NOT rely on odor to decide if your mask is worn out. You will not smell it before becoming over exposed.

John
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  #35 (permalink)  
Old 09-11-2019, 01:41 PM
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Splitting hairs indeed, I was just stating a fact that they are NOT odorless.

The doc also says "typically" and "probably."
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Old 09-12-2019, 12:08 AM
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Quote:
Originally Posted by dwighty390 View Post
You're right, 3M doesn't specifically call out iso's.

Iso's DO have a smell, however.
If using supplied air, you don't smell them.

Isocyanates love eyeballs, I know that. Easy way to sneak in on guys with half masks.
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Old 09-12-2019, 07:07 AM
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Originally Posted by idrivejunk View Post
If using supplied air, you don't smell them.

Isocyanates love eyeballs, I know that. Easy way to sneak in on guys with half masks.
Yep, I can't wear contacts anymore and I blame it on isos entirely.
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