Smooth-On Smooth-Cast 321

Smooth-Cast 321 resin is an off-white bone colored resin often used when making replica skulls, bones and teeth. Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. 

Data At-A-Glance

Mix Ratio By Volume 1A:1B
Mix Ratio By Weight 100A:90B
Specific Gravity 1.05 g/cc
Specific Volume 26.4 cu. in./lb.
Color Off White
Pot Life 9 minutes
Cure Time 30 minutes
Tensile Strength 3,000 psi
Elongation @ Break 8 %
Compressive Modulus 40,300 psi
Shrinkage 0.007 in. / in.
Shore Hardness 70 D
Heat Deflection Temp 140 °F
Tensile Modulus 138,000 psi
Flexural Strength 3,500 psi
Flexural Modulus 110,000 psi
Compressive Strength 3,550 psi
Mixed Viscosity 80 cps

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