Poly-Fast 72-40 Liquid Rubber

This product may soften/degrade with age and should not be considered for molds where long shelf life is required. For mold rubber options that will not soften with age, consider Poly 74-Series polyurethane mold rubbers. Shake or stir Part A & Part B before use. This is a 1A:10B mix ratio product that must be measured by weight. The color of polyurethane Part Bs may change in color from batch to batch or may darken with age, but product performance is not affected. For additional physical property specifications, refer to the Physical Properties Bulletin.