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Smooth-Cast™ 326

Smooth-Cast™ 326 vs. TASK™ 18

Ultra Low Viscosity Liquid Plastics

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TASK™ 18

Smooth-Cast™ 326 vs. TASK™ 18Smooth-Cast™ 326

Aluminum Filled Urethane Resin With Very High Compressive Strength

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Key Differences

Mixed Viscosity100 cps4,400 cps
Mix Ratio By Volume1A:1BN/A (gram scale required)
Pot Life9 minutes20 minutes
Cure Time60 minutes16 hours
Shore D Hardness7288
Specific Volume25.9 cu. in./lb.17.6 cu. in./lb.
ColorClear AmberMetal Gray
Tensile Modulus140,000 psi514,000 psi
Elongation @ Break10 %1 %
Compressive Strength3,080 psi8,420 psi
Compressive Modulus32,200 psi97,300 psi
Flexural Strength3,100 psi10,700 psi
Shrinkage0.0075 in. / in.0.0006 in. / in.
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™ 326TASK™ 18
Product Type
  • Urethane Resins
  • Urethane Resins
Mixed Viscosity100 cps4,400 cps
Mix Ratio By Volume1A:1B
Mix Ratio By Weight115A:100B26A:100B
Pot Life9 minutes20 minutes
Cure Time60 minutes16 hours
Shore D Hardness7288
Specific Gravity1.07 g/cc1.57 g/cc
Specific Volume25.9 cu. in./lb.17.6 cu. in./lb.
ColorClear AmberMetal Gray
Tensile Strength3,170 psi3,250 psi
Tensile Modulus140,000 psi514,000 psi
Elongation @ Break10 %1 %
Compressive Strength3,080 psi8,420 psi
Compressive Modulus32,200 psi97,300 psi
Flexural Strength3,100 psi10,700 psi
Flexural Modulus95,700 psi86,000 psi
Shrinkage0.0075 in. / in.0.0006 in. / in.
Heat Deflection Temp120 °F149 °F

Product Description

Smooth-Cast™ 326

The Smooth-Cast™ 325, 326 & 327 ColorMatch™ Series plastics are fast-cast 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 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). 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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TASK™ 18

TASK™ 18 is a relatively low viscosity aluminum filled urethane casting resin that was developed specifically for making short run vacuum forming or thermoforming molds.

When Parts A and B are mixed in proper proportion, TASK™ 18 cures overnight at room temperature with negligible shrinkage to a very hard plastic that has a very high compressive and flexural strength. Cured TASK™ 18 can be polished, machined, drilled, painted, etc. TASK™ 18 is also used to make industrial production parts, prototype parts and tracing patterns.

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