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Smooth-Cast™ 325

Smooth-Cast™ 320 vs. Smooth-Cast™ 325

Ultra Low Viscosity Liquid Plastics

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Smooth-Cast™ 320

Smooth-Cast™ 320 vs. Smooth-Cast™ 325Smooth-Cast™ 325

Off-White, Ultra Low Viscosity Liquid Plastics

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Key Differences

ColorClear AmberOff White
Compressive Modulus36,500 psi45,800 psi
Flexural Modulus101,000 psi132,000 psi
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™ 325Smooth-Cast™ 320
Product Type
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity100 cps80 cps
Mix Ratio By Volume1A:1B1A:1B
Mix Ratio By Weight115A:100B100A:90B
Pot Life2.5 minutes3 minutes
Cure Time10 minutes10 minutes
Shore D Hardness7270
Specific Gravity1.07 g/cc1.05 g/cc
Specific Volume25.9 cu. in./lb.26.4 cu. in./lb.
ColorClear AmberOff White
Tensile Strength3,170 psi3,000 psi
Tensile Modulus140,000 psi138,000 psi
Elongation @ Break10 %10 %
Compressive Strength3,500 psi3,650 psi
Compressive Modulus36,500 psi45,800 psi
Flexural Strength3,690 psi4,500 psi
Flexural Modulus101,000 psi132,000 psi
Shrinkage0.01 in. / in.0.01 in. / in.
Heat Deflection Temp120 °F140 °F

Product Description

Smooth-Cast™ 325

The Smooth-Cast™ 325, 326 & 327 ColorMatch™ Series plastics are urethane resins that were developed specifically for adding color pigments and fillers to achieve true color representation or filler effect. The ColorMatch™ Series is formulated “color neutral”. Small amounts of pigment will yield accurate, vivid colors from cured castings using So-Strong™ tints, UVO™ pigments or Ignite™ color pigments. The ColorMatch™ Series offers the convenience of a 1A: 1B mix ratio by volume and has a very low viscosity. Demold times range from about 10 minutes to 2-4 hours (depending on product, mass and mold configuration). Note: Large mass castings will get very hot and shrink more, depending on mold configuration.

The ColorMatch™ Series also readily accept fillers (such as URE-FIL™ 3 from Smooth-On). Because of its neutral color, Smooth-Cast™ 325 is ideal for creating marble and wood grain casting effects, or duplicating the look of real metal by adding bronze, brass or other metal powder. Applications for the ColorMatch™ Series plastics include making pigmented prototype models or figures, special effect props, reproducing small to medium size sculptures, decorative jewelry, etc.

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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.).

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