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Key Differences
| Mixed Viscosity | 4,400 cps | 80 cps |
| Mix Ratio By Volume | N/A (gram scale required) | 1A:1B |
| Pot Life | 20 minutes | 3 minutes |
| Cure Time | 16 hours | 10 minutes |
| Shore D Hardness | 88 | 70 |
| Specific Volume | 17.6 cu. in./lb. | 26.4 cu. in./lb. |
| Color | Metal Gray | White |
| Tensile Modulus | 514,000 psi | 139,500 psi |
| Elongation @ Break | 1 % | 5 % |
| Compressive Strength | 8,420 psi | 4,000 psi |
| Compressive Modulus | 97,300 psi | 45,800 psi |
| Flexural Strength | 10,700 psi | 4,510 psi |
| Flexural Modulus | 86,000 psi | 128,000 psi |
| Shrinkage | 0.0006 in. / in. | 0.01 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™ 18 | Smooth-Cast™ 300 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 4,400 cps | 80 cps |
| Mix Ratio By Volume | — | 1A:1B |
| Mix Ratio By Weight | 26A:100B | 100A:90B |
| Pot Life | 20 minutes | 3 minutes |
| Cure Time | 16 hours | 10 minutes |
| Shore D Hardness | 88 | 70 |
| Specific Gravity | 1.57 g/cc | 1.05 g/cc |
| Specific Volume | 17.6 cu. in./lb. | 26.4 cu. in./lb. |
| Color | Metal Gray | White |
| Tensile Strength | 3,250 psi | 3,000 psi |
| Tensile Modulus | 514,000 psi | 139,500 psi |
| Elongation @ Break | 1 % | 5 % |
| Compressive Strength | 8,420 psi | 4,000 psi |
| Compressive Modulus | 97,300 psi | 45,800 psi |
| Flexural Strength | 10,700 psi | 4,510 psi |
| Flexural Modulus | 86,000 psi | 128,000 psi |
| Shrinkage | 0.0006 in. / in. | 0.01 in. / in. |
| Heat Deflection Temp | 149 °F | 120 °F |
Product Description
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.
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.