Poly 74-40 Liquid Rubber
Poly 74-40 is a 2A:1B mix, A40 hardness, liquid polyurethane rubber that can be demolded in ~16 hours. It is a firmer version of Poly 74-30, our most versatile rubber.
It is often used to make molds for dimensionally stable plaster castings, poured blanket molds used for casting Glass Fiber Reinforced Cement (GFRC), and for casting plaster molds and dyes for hobby ceramic applications. Poly 74-40 molds can also be used for casting wax and limited resins (polyurethane, epoxy, polyester resin – with proper release agents).
|Mix Ratio||Shore Hardness||Pour Time||Cured Color||Mixed Viscosity||Specific Volume||Demold Time|
|2A:1B||A40||20 min.||Varies||3,400 cP||27.5 in³/lb||~16 hr.|
|Accessories: 74/75 Part C Softener, 74/75 Part X Accelerator, PolyFiber II Thickening Agent, UV Additive, Tietex® Fabric, Poly Purge Aerosol Dry Gas|