|
Be aware that respirators with
the normal activated carbon canisters are not effective for
removal of the isocyanates that are released during the curing of acrylic
polyurethane paints such as Imron. Not only is the stuff not absorbed very
effectively, the isocyanates also enter the body through the skin and
particularly the mucous membranes of the eyes.
Both OSHA and the manufacturers
recommend forced air respirator systems. Hobby Air sell a nice system for
a reasonable fee. I've used it for two airplanes now, and the only beef I
have with it is that it is sometimes difficult to see inside the Tyvek
hood. The transparent faceplates get fogged, but are replaceable.
Buy plenty of them if you order a system.
The exposure data on isocyanates
is actually pretty hard to interpret. There have been a few fatalities
from cardiac effects, but they are rare, and the exposure standards are all
geared to people with occupational exposure, i.e., people using the stuff every
day. Calculated risk with a canister respirator? Make your own
decision.
Jim Cameron
Medina, Texas
[Soon moving to Boerne Stage Airfield, 5C1, to open
a builder assist center this summer.]
|