Poly 74-30 Liquid Rubber
Poly 74-30 is a 1A:1B mix, A30 hardness, liquid polyurethane rubber that can be demolded in ~16 hours. This liquid rubber is great for making molds for casting materials such as concrete, plaster, resins (polyurethane, polyester, epoxy – with proper release agents), and wax. This rubber is used extensively by art foundries and individual artists for making molds for sculptural reproduction in wax (for hot bronze) or for bonded bronze casting.
There are two other variations of Poly 74-30 available: Poly 74-30 Clear & Poly 74-30 High-Tear (HT). Poly 74-30 Clear has the same physical properties as Poly 74-30, but cures to a transparent amber color instead of an opaque amber color. Poly 74-30 HT offers higher tear and tensile strength compared to the standard Poly 74-30.
|Mix Ratio||Shore Hardness||Pour Time||Cured Color||Mixed Viscosity||Specific Volume||Demold Time|
|1A:1B||A30||25-30 min.||Amber/Varies||2,000 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|