To which two hazardous chemicals is a worker exposed when applying polyester resin for FRP?

• A. Toluene and methanol.
• B. Acetone and toluene.
• C. Styrene and acetone.
• D. Ethyl acetate and xylene.

Answer: (C)

Exposure to volatile organic compounds during polyester resin application in FRP work comes mainly from the resin’s styrene monomer and the solvents used with it, such as acetone. Styrene is the primary hazardous chemical in the resin system, vaporizing readily and posing inhalation and irritation risks with repeated exposure. Acetone is commonly used for thinning, cleaning tools, and removing residues, and it carries its own inhalation and skin contact hazards, as well as being highly flammable. The other options list solvents not as characteristically involved in the typical polyester resin application process, so pairing styrene with acetone best matches the exposure a worker would encounter.