Mold Star 31T

SKU: 801911

Size: Pint Kit
Sale price$42.95

unit(s) in Stock.


unit(s) in Stock.


unit(s) in Stock.

*Price and availability may vary.


Unit Size Net Weight
Pint Kit 2 lb
Gallon Kit 16 lb
Five Gallon Kit 80 lb



Mold Star 31T is an easy to use translucent platinum cure silicone that is mixed 1A:1B by volume (no weighing scale necessary). Features a relatively low viscosity and vacuum degassing is not required for most applications.

Mold Star 31T cures to a soft, strong rubber that is tear resistant and exhibits very low long term shrinkage. Molds made with Mold Star will last a long time in your mold library and are good for casting wax, gypsum, resins, concrete and other materials. Mold Star 31T silicone can be thickened with THI-VEX thickener for brush-on application and effects. An infinite number of color effects can be achieved by adding Silc Pig silicone pigments or Cast Magic effects powders. Mold Star 31T is heat resistant up to 450F (232C) and is suitable for casting low-temperature melt metal alloys.

Note: This product will not cure against surfaces containing sulfur, even when sealed.

Guide to Making Silicone Molds from SLA 3D Printed Models
Technical Properties
Mix Ratio by Weight 1A:1B
Mix Ratio by Volume 1A:1B
Pot Life 5 minutes
Cure Time 23 minutes
Color Translucent
Shore Hardness 30A
Mixed Viscosity 11,000 cps
Shrinkage < .001 in./in.
Specific Volume 25.6 cu. in./lb.
Specific Gravity 1,08g/cc
Useful Temperature (max)< 450F
Useful Temperature (min)< -65F
Tensile Strength 420 psi
100% Modulus 47 psi
Elongation @ Break 400%
Die B Tear Strength 90 pli


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