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Specialty Compounds RTP Company

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Reynolds PMC® 121/50 Polyurethane Rubber Compounds
Categories: Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane, Elastomer, Unreinforced

Material Notes: Product Overview: The PMC™-121 Series urethane rubbers feature convenient one-to-one by volume mix ratios. PMC™-121/30 Dry and PMC™-121/30 Wet are exceptionally strong and abrasion resistant for soft urethane mold rubbers. Pick the one best suited for your application. The dry version does not exude oil and can be used for casting waxes, Smooth-On liquid plastics, gypsum plasters and other materials. The wet version exudes oil that aids in demolding hard plasters and concrete. PMC™-121/50 is a “wet-only” mold rubber that is long lasting and durable when used in a variety of applications including reproduction of ornamental plaster, precast concrete and ceramic case molds. Note: “wet” rubber has a higher net shrinkage value vs. “dry” rubber. PMC™-121 Series mold rubbers are easy to mix and pour and are exceptionally strong. They are suited for a variety of applications including making molds to reproduce sculpture and architectural elements, as well as for making special effects, toys and prototypes. These rubbers will meet the stringent demands of production casting of wax, plasters, concrete, resins and epoxies. Vibrant colors can be achieved by adding So-Strong™ Color Tints, available from Smooth-On.

Information provided by Reynolds Advanced Materials

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Physical PropertiesOriginal ValueComments
Specific Gravity 1.04 g/ccASTM D-1475
Viscosity 1400 cPMixed; ASTM D-2393
Linear Mold Shrinkage <= 0.0010 in/in
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 50ASTM D-2240
Tensile Strength 350 psiASTM D-412
Elongation at Break 500 %ASTM D-412
100% Modulus 82.0 psiASTM D-412
Tear Strength 85.0 pliDie C; ASTM D-624
 
Processing PropertiesOriginal ValueComments
Cure Time 16.0 hour
Pot Life 30.0 minASTM D-2471
 
Descriptive Properties
ColorClear Amber
Mix Ratio1A:1Bby volume
 1A:1Bby weight
Specific Volume26.7[cu. in./lb.]

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PREYN074 / 296775

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