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PMC®-746 Technical Specifications

Polyurethane Rubber Compound

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All Technical Data

Product Type
  • Urethane Rubber
Mixed Viscosity1,200 cps
Mix Ratio By Volume2A:1B
Mix Ratio By Weight2A:1B
Pot Life15 minutes
Cure Time16 hours
Shore A Hardness60
Specific Gravity1.03 g/cc
Specific Volume26.9 cu. in./lb.
Die C Tear Strength100 pli
Tensile Strength700 psi
Elongation @ Break650 %
100% Modulus220 psi
Shrinkage< .001 in. / in.

Product Description


PMC®-746 was developed to make molds for casting gypsum plasters. This product is well suited for use as a rubber case mold – especially large case molds where extra rigidity is required. Shore hardness is 60A. Because of its durability and moisture resistant properties PMC®-746 is also used by zoos and museums for a variety of mold-making, display and exhibit applications. It features a convenient mix ratio (2:1 by weight or volume), and contains no mercury.

Other applications include making plaster block molds, reproducing ornamental plaster (architectural restoration), pre-cast concrete molds, casting waxes, Smooth-On rigid polyurethanes and epoxies and also for making a variety of special effects for movies and theatre.

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