Re: respirators does any one use them?
- "A charcoal respirator will not protect you from the icoyanates."
I am going to have to disagree. A charcoal respirator is accepted in industrial safety practice (by OSHA) for intermittent low level exposure (like laboratory work)to isocyanates. We are talking about half mask with replaceable cartridges here. One should also note that charcoal cartridges are only rated to a total of 8 hours of accumulated use maximum, and must be kept in a sealed container when not in use. I would always use one for spraying any type of paint. For factory floor multi-hour shift work, a fresh air mask is generally required.
- If you look into icocyanates in paint such as Dupont Imron you will find that there is no proof that a respirator actually works 100%. Yes they do say it's OK on a short term basis and that the filter cartridges are supposedly good for 8 hours and thats it but they have no idea of any long term usage and I'm talking about years here not 8 hours a day.
Here's an excerpt from an article on a webpage I found on Icocyanates in polyurethane resin.
URETHANE RESIN SYSTEMS
Monona Rossol, Health and Safety Director
United Scenic Artists, Local USA 829, IATSE
181 Thompson St., # 23
New York, NY 10012-2586
© October 10, 1995 (revised 6/8/07, 7-31-09)
STRAIGHT TALK ABOUT URETHANE FOAM AND CASTING RESINS
In the art and theater world, air-purifying respirators almost never can be used safely or legally
as protection against products which release diisocyanates. Shops must either have a local
ventilation system (e.g. a spray booth) that air sampling tests show completely capture the
diisocyanates, or employers should provide air-supplied full-face respirators with protective
clothing for the skin for workers using significant amounts of two-component urethane. For the
full OSHA policy, see the July 18, 2000 letter of interpretation at www.osha.gov.
But there are some urethane systems that only appear to be a single component product. For
example, Great StuffTM looks like a single product, but the two components are mixed in the long
nozzle. So any time you purchase a urethane product, read the label and Material Safety Data
Sheet (MSDS) carefully. If the label or MSDS indicates that the substance releases
diisocyanates, is it highly hazardous.
IF THEY’RE SO BAD, WHY AIN’T I DEAD?
Not everyone exposed to isocyanates becomes seriously ill, just as not everyone is allergic to
poison ivy. Although the isocyanates are irritating to all people at high levels, the allergic effects
can manifest themselves at very low levels in only some people.
I still haven't found any actual proof that pouring resin in my basement shop is presenting anything dangerous, but there's no proof that it isn't either. So with all this information, I'm nowhere closer to finding an answer than I was before.
Kenny./Blue Oval ResinWorks.
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- Thanks for the additional information, that's very useful to know.
What I wonder about now is whether PU casting resins release (di-)
isocyanates during mixing and curing. With spray painting an enormous
total surface is created by the large number of tiny droplets, but
in casting we're creating only a very small area generally.
At 17:17 02-12-2012, you wrote:
> "A charcoal respirator will not protect you from the icoyanates."
>I am going to have to disagree. A charcoal respirator is accepted in
>industrial safety practice (by OSHA) for intermittent low level
>exposure (like laboratory work)to isocyanates. We are talking about
>half mask with replaceable cartridges here. One should also note
>that charcoal cartridges are only rated to a total of 8 hours of
>accumulated use maximum, and must be kept in a sealed container when
>not in use. I would always use one for spraying any type of paint.
>For factory floor multi-hour shift work, a fresh air mask is
>Yahoo! Groups Links