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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 800 cps | 100 cps |
| Mix Ratio By Volume | N/A (gram scale required) | 1A:1B |
| Pot Life | 2.5 minutes | 9 minutes |
| Cure Time | 24 hours | 60 minutes |
| Shore D Hardness | — | 72 |
| Shore A Hardness | 90 | — |
| Color | Off-White | Clear Amber |
| Tensile Strength | 1,800 psi | 3,170 psi |
| Elongation @ Break | 125 % | 10 % |
| Shrinkage | 0.005 in. / in. | 0.0075 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 | Smooth-Cast™ 326 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 800 cps | 100 cps |
| Mix Ratio By Volume | — | 1A:1B |
| Mix Ratio By Weight | 100A:120B | 115A:100B |
| Pot Life | 2.5 minutes | 9 minutes |
| Handling Time | 30 minutes | — |
| Cure Time | 24 hours | 60 minutes |
| Shore D Hardness | — | 72 |
| Shore A Hardness | 90 | — |
| Specific Gravity | 1.15 g/cc | 1.07 g/cc |
| Specific Volume | 24.1 cu. in./lb. | 25.9 cu. in./lb. |
| Color | Off-White | Clear Amber |
| Tensile Strength | 1,800 psi | 3,170 psi |
| Tensile Modulus | — | 140,000 psi |
| Elongation @ Break | 125 % | 10 % |
| Compressive Strength | — | 3,080 psi |
| Compressive Modulus | — | 32,200 psi |
| Flexural Strength | — | 3,100 psi |
| Flexural Modulus | — | 95,700 psi |
| Shrinkage | 0.005 in. / in. | 0.0075 in. / in. |
| Heat Deflection Temp | — | 120 °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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Smooth-Cast™ 326
The Smooth-Cast™ 325, 326 & 327 ColorMatch™ Series plastics are fast-cast resins that were developed specifically for adding color pigments and fillers to achieve true color representation or filler effect. The ColorMatch™ Series is formulated “color neutral”. Small amounts of pigment will yield accurate, vivid colors from cured castings using So-Strong™ tints or Ignite™ color pigments. The ColorMatch™ Series offers the convenience of a 1A: 1B mix ratio by volume and has a very low viscosity. Demold times range from about 10 minutes to 2-4 hours (depending on product, mass and mold configuration). Note: Large mass castings will get very hot and shrink more, depending on mold configuration.
The ColorMatch™ Series also readily accept fillers (such as URE-FIL™ 3 from Smooth-On). Applications for the ColorMatch™ Series plastics include making pigmented prototype models or figures, special effect props, reproducing small to medium size sculptures, decorative jewelry, etc.