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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 800 cps | 11,000 cps |
| Mix Ratio By Volume | N/A (gram scale required) | 1A:1B |
| Pot Life | 2.5 minutes | 6 minutes |
| Cure Time | 24 hours | 30 minutes |
| Shore A Hardness | 90 | 20 |
| Color | Off-White | Translucent |
| Tensile Strength | 1,800 psi | 420 psi |
| Elongation @ Break | 125 % | 470 % |
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
| KX Flex™ 90 | Mold Star™ 20T | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 800 cps | 11,000 cps |
| Mix Ratio By Volume | — | 1A:1B |
| Mix Ratio By Weight | 100A:120B | 1A:1B |
| Pot Life | 2.5 minutes | 6 minutes |
| Handling Time | 30 minutes | — |
| Cure Time | 24 hours | 30 minutes |
| Shore A Hardness | 90 | 20 |
| Specific Gravity | 1.15 g/cc | 1.08 g/cc |
| Specific Volume | 24.1 cu. in./lb. | 25.6 cu. in./lb. |
| Color | Off-White | Translucent |
| Die B Tear Strength | — | 90 pli |
| Tensile Strength | 1,800 psi | 420 psi |
| Elongation @ Break | 125 % | 470 % |
| 100% Modulus | — | 47 psi |
| Shrinkage | 0.005 in. / in. | <.001 in. / in. |
| Useful Temperature (min) | — | -65 °F |
| Useful Temperature (max) | — | 450 °F |
Product Description
KX Flex™ 90
KX Flex™ Series urethanes are fast setting flexible urethane casting elastomers that cure quickly and offer exceptional physical and performance properties including high impact resistance. KX Flex™ Series urethanes are easy to color using SO-Strong™, UVO™ or IGNITE™ colorants. KX Flex™ urethanes are phthalate free, mercury free and MOCA free.
KX Flex™ Series urethanes have a pot life of 2.5 minutes and handling time of 30 minutes (depending on mass). With Shore hardness values of 40A, 60A and 90A, this material is used for a variety of applications including fast mold making, fast model duplication, prototyping, durable miniatures, props and special effects, or making parts that are impact resistant. Fully cured castings are flexible, tough and durable.
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Mold Star™ 20T
Mold Star™ 20T is an easy to use Shore 20A translucent platinum silicone that is mixed 1A:1B by volume (no weighing scale necessary). It features a relatively low viscosity and vacuum degassing is not required for most applications. Pot life is 6 minutes and cure time is 30 minutes at room temperature.