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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 4,400 cps | Brushable |
| Mix Ratio By Volume | N/A (gram scale required) | 1A:1B |
| Cure Time | 16 hours | 6 hours |
| Shore D Hardness | 88 | — |
| Shore A Hardness | — | 40 |
| Specific Volume | 17.6 cu. in./lb. | 23.5 cu. in./lb. |
| Color | Metal Gray | Green |
| Tensile Strength | 3,250 psi | 486 psi |
| Elongation @ Break | 1 % | 324 % |
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 | Rebound™ 40 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 4,400 cps | Brushable |
| Mix Ratio By Volume | — | 1A:1B |
| Mix Ratio By Weight | 26A:100B | 1A:1B |
| Pot Life | 20 minutes | 20 minutes |
| Cure Time | 16 hours | 6 hours |
| Shore D Hardness | 88 | — |
| Shore A Hardness | — | 40 |
| Specific Gravity | 1.57 g/cc | 1.14 g/cc |
| Specific Volume | 17.6 cu. in./lb. | 23.5 cu. in./lb. |
| Color | Metal Gray | Green |
| Die B Tear Strength | — | 106 pli |
| Tensile Strength | 3,250 psi | 486 psi |
| Tensile Modulus | 514,000 psi | — |
| Elongation @ Break | 1 % | 324 % |
| Compressive Strength | 8,420 psi | — |
| Compressive Modulus | 97,300 psi | — |
| Flexural Strength | 10,700 psi | — |
| Flexural Modulus | 86,000 psi | — |
| Shrinkage | 0.0006 in. / in. | <.001 in. / in. |
| Heat Deflection Temp | 149 °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.
Rebound™ 40
Rebound™ 40 is an easy-to-use platinum-cure silicone rubber which self-thickens for making brush-on molds of almost any model. Mixed 1A:1B by volume (no scale necessary), Rebound™ rubber can be applied with a brush or spatula to vertical surfaces without sagging and will cure with negligible shrinkage to a flexible rubber.