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Key Differences
| Mixed Viscosity | 100 cps | 500 cps |
| Pot Life | 9 minutes | 6 minutes |
| Color | Clear Amber | White |
| Tensile Strength | 3,170 psi | 5,500 psi |
| Tensile Modulus | 140,000 psi | 270,000 psi |
| Elongation @ Break | 10 % | 7.5 % |
| Compressive Strength | 3,080 psi | 7,100 psi |
| Compressive Modulus | 32,200 psi | 78,500 psi |
| Flexural Strength | 3,100 psi | 7,100 psi |
| Flexural Modulus | 95,700 psi | 250,000 psi |
| Shrinkage | 0.0075 in. / in. | 0.0058 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™ 326 | TASK™ 21 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 100 cps | 500 cps |
| Mix Ratio By Volume | 1A:1B | 2A:1B |
| Mix Ratio By Weight | 115A:100B | 2A:1B |
| Pot Life | 9 minutes | 6 minutes |
| Cure Time | 60 minutes | 1 hour |
| Shore D Hardness | 72 | 75 |
| Specific Gravity | 1.07 g/cc | 1.07 g/cc |
| Specific Volume | 25.9 cu. in./lb. | 25.9 cu. in./lb. |
| Color | Clear Amber | White |
| Tensile Strength | 3,170 psi | 5,500 psi |
| Tensile Modulus | 140,000 psi | 270,000 psi |
| Elongation @ Break | 10 % | 7.5 % |
| Compressive Strength | 3,080 psi | 7,100 psi |
| Compressive Modulus | 32,200 psi | 78,500 psi |
| Flexural Strength | 3,100 psi | 7,100 psi |
| Flexural Modulus | 95,700 psi | 250,000 psi |
| Shrinkage | 0.0075 in. / in. | 0.0058 in. / in. |
| Heat Deflection Temp | 120 °F | 144 °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™ 21
TASK™ 21 is a performance urethane casting resin that has been described by many as having similar performance and mechanical characteristics to ABS plastic, with high compressive and flexural strength. TASK 21 has no odor and is easy to process. Mix ratio is 2A:1B by weight or volume. Pot life is 6 minutes and handling strength is reached in 60 minutes at room temperature (depending on mass and configuration).
TASK 21 features a low mixed viscosity of 500 cps and readily de-airs itself when cast into molds. SO-Strong™ or IGNITE™ colorants can be added for color and a variety of powder fillers can be added to alter performance or appearance characteristics. Applications for TASK 21 include rapid prototyping, casting strong and highly detailed models, making holding / assembly fixtures, figurines and decorative castings.
IMPORTANT - TASK 21 can not be cast into platinum-cure silicone molds. We recommend casting TASK 21 into tin-cure silicone or urethane rubber molds (using a release agent).