The MI-26 is a Russian built military helo. It is an all metal flying tank so discussions of composites are a waste of time.
So we are back to POL, plastics, rubber and paint. Any industrial safety expert should be able to advise.
Unless you are going for the gold there is likely nothing to worry about. Which is why the rest of your unit, your superiors, and the Medical Officer apparently haven't been able to contribute anything.
Still no symptoms?