BR 571 Aliphatic urethane acrylate oligomer Bomar Specialties PU - Prepolymers >> Urethane acrylate PU - Prepolymers >> Polyether Aliphatic linear polyether urethane acrylate oligomer. An aliphatic that is in our most versatile product line and includes our patented functional oligomer. This cured oligomer features outstanding hydrolytic stability, low toxicity, excellent abrasion resistance and weatherability. Provides low toxicity, hydrolic stability, oil and chemical resistance, weatherability, good adhesion and gloss. Aliphatic linear polyether urethane acrylate oligomer. Provides low toxicity, hydrolic stability, oil and chemical resistance, weatherability, good adhesion and gloss.