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Key Differences
| Mixed Viscosity | 150 cps | 4,400 cps |
| Mix Ratio By Volume | 1A:1B | N/A (gram scale required) |
| Cure Time | 90 minutes | 16 hours |
| Specific Volume | 24.7 cu. in./lb. | 17.6 cu. in./lb. |
| Color | White | Metal Gray |
| Tensile Strength | 6,650 psi | 3,250 psi |
| Tensile Modulus | 290,000 psi | 514,000 psi |
| Elongation @ Break | 6 % | 1 % |
| Flexural Modulus | 288,000 psi | 86,000 psi |
| Shrinkage | 0.0025 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
| TASK™ 3 | TASK™ 18 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 150 cps | 4,400 cps |
| Mix Ratio By Volume | 1A:1B | — |
| Mix Ratio By Weight | 115A:100B | 26A:100B |
| Pot Life | 20 minutes | 20 minutes |
| Cure Time | 90 minutes | 16 hours |
| Shore D Hardness | 80 | 88 |
| Specific Gravity | 1.12 g/cc | 1.57 g/cc |
| Specific Volume | 24.7 cu. in./lb. | 17.6 cu. in./lb. |
| Color | White | Metal Gray |
| Tensile Strength | 6,650 psi | 3,250 psi |
| Tensile Modulus | 290,000 psi | 514,000 psi |
| Elongation @ Break | 6 % | 1 % |
| Compressive Strength | 8,300 psi | 8,420 psi |
| Compressive Modulus | 78,000 psi | 97,300 psi |
| Flexural Strength | 9,500 psi | 10,700 psi |
| Flexural Modulus | 288,000 psi | 86,000 psi |
| Shrinkage | 0.0025 in. / in. | 0.0006 in. / in. |
| Heat Deflection Temp | 134 °F | 149 °F |
Product Description
TASK™ 3
TASK™ 3 low viscosity, high performance casting resin offers superior physical and performance properties compared to our popular Smooth-Cast™ Series of general purpose casting resins. Vacuum degassing is not necessary and it offers the convenience of a 1A:1B by volume (115A:100B by weight) mix ratio.
TASK™ 3 is white. It has high tensile and flexural strength, as well as high flexural modulus. This plastic was formulated for a variety of industrial applications including pattern making and making prototype models. This resin is designed for casting in thicknesses up to ½” (1.27 cm). TASK™ Plastics are moderately priced and are available in trial kits, one-gallon, five-gallon, 55-gallon drum and totes.
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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.