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