Poly 74-45 is a very tough, high tear, high elongation rubber. This product is ideal for high volume concrete and plaster casting. As with other 74 Series products, it can be poured as supplied or thickened with Cab-O-Sil for creating brushed molds.
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Poly 74-45 is a 1A:1B mix, A~45 hardness, polyurethane liquid rubber that cures in 16-24 hours and is designed for making high-performance rubber molds for casting materials such as plaster (millwork, home décor, etc.), wax (candles & lost wax varieties), concrete, GFRC, GRG and resins (polyurethane, polyester, epoxy - with proper release agents). Poly 74-45 molds can be poured as supplied or brushed-on by mixing in Poly Fiber II thickener or fumed silica. Poly 74-45 liquid rubber is an excellent multi-purpose, economical mold material that will provide long mold life, durability and consistent performance under repeated casting. Poly 74-45 is popular for casting decorative architectural concrete panels and accessories.
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