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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 35,000 cps | 675 cps |
| Mix Ratio By Volume | 1A:1B | N/A (gram scale required) |
| Pot Life | 25 minutes | 75 minutes |
| Shore D Hardness | — | 85 |
| Shore A Hardness | 37 | — |
| Color | Water Clear Translucent | Clear |
| Elongation @ Break | 400 % | 12 % |
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
| SORTA-Clear™ 37 | Crystal Clear™ 221 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 35,000 cps | 675 cps |
| Mix Ratio By Volume | 1A:1B | — |
| Mix Ratio By Weight | 1A:1B | 100A:75B |
| Pot Life | 25 minutes | 75 minutes |
| Cure Time | 4 hours | Overnight Followed By Post Cures |
| Shore D Hardness | — | 85 |
| Shore A Hardness | 37 | — |
| Specific Gravity | 1.08 g/cc | 1.07 g/cc |
| Specific Volume | 25.6 cu. in./lb. | 25.9 cu. in./lb. |
| Color | Water Clear Translucent | Clear |
| Die B Tear Strength | 105 pli | — |
| Tensile Strength | 600 psi | — |
| Tensile Modulus | — | 286,000 psi |
| Ultimate Tensile | — | 8,190 psi |
| Elongation @ Break | 400 % | 12 % |
| 100% Modulus | 90 psi | — |
| Compressive Strength | — | 10,100 psi |
| Compressive Modulus | — | 87,000 psi |
| Flexural Strength | — | 11,400 psi |
| Flexural Modulus | — | 305,000 psi |
| Shrinkage | <.001 in. / in. | 0.0173 in. / in. |
| Heat Deflection Temp | — | 176 °F |
| Index of Refraction at 20°C | — | 1.50084 |
| Index of Refraction at 25°C | — | 1.50035 |
Product Description
SORTA-Clear™ 37
SORTA-Clear™ Series rubbers are premium water clear translucent silicone rubbers (platinum catalyst) which cure at room temperature with negligible shrinkage. SORTA-Clear™ 37 has Shore 37A hardness and features high tensile and tear strength. This product also offers the convenience of a 1A:1B by volume mix ratio.
SORTA-Clear™ silicones are ideal for making prototype, jewelry or other molds of any configuration where model visibility is important (i.e. extracting a model from the mold via cutting). Materials such as urethane, epoxy or polyester resins can then be cast into SORTA-Clear™ silicone without application of a release agent. Other materials such as wax and low melt metal alloys can also be cast into SORTA-Clear™. SORTA-Clear™ can be pigmented with SILC Pig™ silicone pigments.
SORTA Clear™ 37 silicone rubber is FOOD SAFE and can be used for culinary applications including casting chocolate and other confections.
Certified Skin Safe - Cured SORTA Clear™ 37 is skin safe and certified by an independent laboratory.
› Click here for more SORTA-Clear™ silicone products.
Crystal Clear™ 221
Crystal Clear™ 221 is a water white clear resin made specifically for applications that require absolute clarity. This is a “heat cure” system and a harder version of our popular Crystal Clear™ Series resins (Shore 85D).
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.