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Smooth-Cast® 320

Smooth-Cast® 320 Technical Specifications

Off-White, Ultra Low Viscosity Liquid Plastics

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All Technical Data

Smooth-Cast® 320
Product Type
  • Urethane Resins
Mixed Viscosity80 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight100A:90B
Pot Life3 minutes
Cure Time10 minutes
Shore D Hardness70
Specific Gravity1.05 g/cc
Specific Volume26.4 cu. in./lb.
ColorOff White
Tensile Strength3,000 psi
Tensile Modulus138,000 psi
Elongation @ Break10 %
Compressive Strength3,650 psi
Compressive Modulus45,800 psi
Flexural Strength4,500 psi
Flexural Modulus132,000 psi
Shrinkage0.01 in. / in.
Heat Deflection Temp140 °F

Product Description

Smooth-Cast® 320

The Smooth-Cast® 320 Series consists of ultra-low viscosity casting resins that yield virtually bubble-free off-white castings. The Smooth-Cast® 320 resins are sister products to our popular Smooth-Cast® 300 Series of bright white plastics, but are easier to color using SO-Strong® or Ignite® color tints. Smooth-Cast® 320 series is easy to mix and pour, offering the convenience of a 1A:1B by volume or 100A : 90B by weight mix ratio.

The Smooth-Cast® 320 Series resins readily accept pigments and fillers (such as URE-FIL® 3, 5 and 7 from Smooth-On). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast® 320 Series resins include reproducing small to medium size sculptures, making prototype models, special effect props, decorative jewelry and taxidermy (bones, antlers, teeth etc.).

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