... hard) foam polyurethane, epoxy resin, polystyrene, acrylic, cellulose acetate, ethyl cellulose and Bakelite resin, polyvinyl acetate resin, and foam fillers gun ... Index name Name Appearance colorless or light yellow oily transparent liquid Chroma(Pt-Co) 50# Acidity(mgKOH/g) ≤0. ... used as f soft or hard polyurethane foam, epoxy resin polystyrene, acrylic acid, cellulose acetate, ethyl cellulose paint, ...