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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 800 cps | 600 cps |
| Pot Life | 2.5 minutes | 2 hours |
| Cure Time | 24 hours | 48 hours |
| Shore D Hardness | — | 80 |
| Shore A Hardness | 90 | — |
| Color | Off-White | Clear |
| Tensile Strength | 1,800 psi | 3,500 psi |
| Elongation @ Break | 125 % | 10 % |
| Shrinkage | 0.005 in. / in. | 0.002 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
| KX Flex™ 90 | Crystal Clear™ 204 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 800 cps | 600 cps |
| Mix Ratio By Weight | 100A:120B | 100A:90B |
| Pot Life | 2.5 minutes | 2 hours |
| Handling Time | 30 minutes | — |
| Cure Time | 24 hours | 48 hours |
| Shore D Hardness | — | 80 |
| Shore A Hardness | 90 | — |
| Specific Gravity | 1.15 g/cc | 1.036 g/cc |
| Specific Volume | 24.1 cu. in./lb. | 26.7 cu. in./lb. |
| Color | Off-White | Clear |
| Tensile Strength | 1,800 psi | 3,500 psi |
| Tensile Modulus | — | 86,240 psi |
| Elongation @ Break | 125 % | 10 % |
| Compressive Strength | — | 4,200 psi |
| Compressive Modulus | — | 44,000 psi |
| Flexural Strength | — | 5,390 psi |
| Flexural Modulus | — | 183,200 psi |
| Shrinkage | 0.005 in. / in. | 0.002 in. / in. |
| Heat Deflection Temp | — | 120 °F |
| Index of Refraction at 20°C | — | 1.49888 |
| Index of Refraction at 25°C | — | 1.49830 |
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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Crystal Clear™ 204
Crystal Clear™ 204 is a water white clear and made specifically for applications that require clarity. These rigid urethane casting resins differ only in working and demold times. Low viscosity ensures easy mixing and pouring. Crystal Clear™ resins cure at room temperature* with negligible shrinkage.
CAUTION: NOT FOR HOME USE. THIS PRODUCT IS FOR INDUSTRIAL USE ONLY. With adequate local exhaust ventilation, respiratory protection is not normally required when using this product. Where risk assessment shows air-purifying respirators are appropriate, follow OSHA respirator regulations and European Standards EN 141, 143 and 371. Protective clothing (gloves and long sleeves) is required to minimize the risk of dermal sensitization. If breathing is affected or a dermal rash develops, immediately cease using this product and seek medical attention. Read SDS before using.