Polytek 74-40 Polyurethane Liquid Mold Rubber
Poly 74-40 Liquid Rubber is a two-part, liquid polyurethane system that cures (RTV) to a Shore A40 rubber. This is a pourable rubber, but it can be easily thickened with PolyFiber II Thickener for brush-on application.
Mix Ratio: 2A/1B by weight
Shore Hardness: A40
Cured Color: Varies
Mix Viscosity: 3400 cP
Shake or Stir Part B before use. 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.
Poly 74-Series Liquid Rubbers consist of two parts (A and B), which, after mixing, cure at room temperature to flexible, high-strength, mold rubbers. Poly 74-Series Rubbers make durable, easy-releasing molds for casting plasters and waxes without release agents. When Poly 74-Series molds are properly prepared, they are also excellent for casting concrete and various resins, such as epoxy, polyester, polyurethane and acrylic