Mold Star® rubbers are easy to use platinum silicones which are mixed 1A:1B by volume (no weighing scale necessary). Mold Star® silicones feature relatively low viscosities and vacuum degassing is not required for most applications. Mold Star® 30 is a harder material, with a 30A Shore hardness.

Mold Star® silicones cure to soft, strong rubbers which are tear resistant and exhibit 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. Cured Mold Star® rubber is heat resistant up to 450°F (232°C) and is suitable for casting low-temperature melt metal alloys. Note: Mold Star® rubbers are not intended for brush-on moldmaking.

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

Data At-A-Glance

Specific Gravity	1.12 g/cc
Specific Volume	24.7 cu. in./lb.
Pot Life	45 minutes
Cure Time	6 hours
Shore Hardness	30 A
Tensile Strength	420 psi
100% Modulus	96 psi
Elongation @ Break	339 %
Die B Tear Strength	88 pli
Color	Blue
Mix Ratio By Volume	1A:1B
Mix Ratio By Weight	100A:96B
Shrinkage	<.001 in. / in.
Useful Temperature (max)	450 °F
Useful Temperature (min)	-65 °F
Mixed Viscosity	12,500 cps