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Poly-Fast 72-40

Poly-Fast 72-40 is a dense, medium hardness rubber used primarily for casting plaster, waxes and in some cases cement. This product can be thickened with a liquid additive Part D to create brushed molds and can be softened with Part C to make rubbers softer than an A-10.

This product may degrade with age and should not be considered for molds where long shelf life is required.

PolyFast 72-40 Part A MSDS PolyFast 72-40 Part B MSDS

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Poly-Fast 72-40 9.9lbs.

CODE: Poly-Fast72-40-99

Price : $76.00 Price: $0.00

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A Shore A~40 liquid polyurethane mold rubber that can be poured as supplied or thickened with liquid Part D, fumed silica or Poly Fiber to make molds for primarily casting wax or plaster. Popular for art foundry, lost wax, bronze casting applications. Cured molds may soften with age - to prevent this effect, consider Poly 74-Series polyurethane mold rubbers.