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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.
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.