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Smooth-Cast™ 300

Smooth-Cast™ 300 vs. Smooth-Cast™ 320

Bright White Liquid Plastic

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Smooth-Cast™ 320

Smooth-Cast™ 300 vs. Smooth-Cast™ 320Smooth-Cast™ 300

Off-White, Ultra Low Viscosity Liquid Plastics

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Key Differences

ColorWhiteOff White
Elongation @ Break5 %10 %
Disclaimer
Although we do our best to ensure accuracy, Smooth-On offers no warranties, promises, and/or representations of any kind, either expressed or implied, as to the accuracy, completeness, or reliability of the information contained on this Compare Tool, nor suitability of the information contained herein to your particular circumstances. Smooth-On assumes no liability for losses or damages of whatever nature (direct, indirect, consequential or other) associated with your use, or inability to use, the Compare Tool, or from your use (or failure to use) the information contained herein. Other useful tools include product technical bulletins and our extensive FAQ section. You can also contact our technical support team.

All Technical Data

Smooth-Cast™ 300Smooth-Cast™ 320
Product Type
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity80 cps80 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight100A:90B100A:90B
Pot Life3 minutes3 minutes
Cure Time10 minutes10 minutes
Shore D Hardness7070
Specific Gravity1.05 g/cc1.05 g/cc
Specific Volume26.4 cu. in./lb.26.4 cu. in./lb.
ColorWhiteOff White
Tensile Strength3,000 psi3,000 psi
Tensile Modulus139,500 psi138,000 psi
Elongation @ Break5 %10 %
Compressive Strength4,000 psi3,650 psi
Compressive Modulus45,800 psi45,800 psi
Flexural Strength4,510 psi4,500 psi
Flexural Modulus128,000 psi132,000 psi
Shrinkage0.01 in. / in.0.01 in. / in.
Heat Deflection Temp120 °F140 °F

Product Description

Smooth-Cast™ 300

The Smooth-Cast™ 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. They offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio. The differences between them are pot life and demold time.

These resins readily accept fillers (such as URE-FIL™ 3 ) and can be colored with SO-Strong™ or Ignite™ color tints (Smooth-Cast™ 325 series accepts pigments better than the Smooth Cast™ 300 series). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast™ 300 Series Liquid Plastics include reproducing small to medium size sculptures, making prototype models, special effect props and decorative jewelry.

Those interested in making roto cast pieces should refer to the Smooth-Cast™ 65D technical bulletin.

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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.).

Click here for more Smooth-Cast™ resin products.

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