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PolyFast
Poly-Fast 72-40
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 A-10.

72-40
72-40
Mix Ratio: 10A to 100B Color: Ivory Shore A Hardness: 40
Viscosity: 4,400 cP Pour Time: 30 min 20 in³ / lb

This product may degrade with age and should not be considered for molds where long shelf life is required.
Poly-Fast 72-40  
Size   
72-40 Part D Thickener  
Size