Smooth-On Mold Star 30 is a platinum silicone rubber. It cures to a soft, strong rubber which is tear resistant and exhibit very low long term shrinkage. It is easy to use with a 1A:1B mix ratio. No scale is needed. Mold Star 30 is relatively a low viscosity silicone and vacuum degassing is not required for most applications.
Mold Star 30 is a harder material, with a 30A Shore hardness and a 6 hour cure time. Color is blue.
Mold Star 30 molds will last a long time in your mold library and are good for casting wax, gypsum, resins, concrete and other materials. Cured Mold Star™ rubber is heat resistant up to 450°F (232°C)
THI-VEX™ is NOT compatible with Mold Star™ rubbers.