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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 300 cps | 30,000 cps |
| Mix Ratio By Volume | 1A:1B | N/A (gram scale required) |
| Pot Life | 3 minutes | 45 minutes |
| Cure Time | 30 minutes | 16 hours |
| Shore D Hardness | 57 | — |
| Shore A Hardness | — | 60 |
| Color | Translucent White | Green |
| Tensile Strength | 2,420 psi | 650 psi |
| Elongation @ Break | 100 % | 270 % |
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
| Smooth-Cast™ 57D | Smooth‑Sil™ 960 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 300 cps | 30,000 cps |
| Mix Ratio By Volume | 1A:1B | — |
| Mix Ratio By Weight | 100A:93B | 100A:10B |
| Pot Life | 3 minutes | 45 minutes |
| Cure Time | 30 minutes | 16 hours |
| Shore D Hardness | 57 | — |
| Shore A Hardness | — | 60 |
| Specific Gravity | 1.05 g/cc | 1.25 g/cc |
| Specific Volume | 26.4 cu. in./lb. | 22.2 cu. in./lb. |
| Color | Translucent White | Green |
| Die B Tear Strength | — | 110 pli |
| Tensile Strength | 2,420 psi | 650 psi |
| Elongation @ Break | 100 % | 270 % |
| 100% Modulus | — | 280 psi |
| Shrinkage | 0.012 in. / in. | <.001 in. / in. |
| Useful Temperature (min) | — | -65 °F |
| Useful Temperature (max) | — | 450 °F |
Product Description
Smooth-Cast™ 57D
Smooth-Cast™ 57D is a semi-rigid urethane plastic that offers a gradual cure profile (does not snap cure), making it suitable for machine or hand rotational casting.
Use For Rotational Casting - Once poured into a suitable rubber mold configuration, the mold can be rotated so that the resin mixture gradually coats the inside of the mold cavity. After an adequate wall thickness is attained inside the mold, the result is a cured hollow casting that is semi-rigid and highly impact resistant.
Use as a Casting Resin – Smooth-Cast™ 57D can also be used as a casting resin for making solid, semi-rigid castings that are tough and durable.
Mix ratio is 1A:1B by volume. Working time is 3 minutes, demold time is 30 minutes and full cure properties are attained after 24 hours. Color is white translucent and the material is very easy to color with SO-Strong™, UVO™ or Ignite™ colorants. Cured resin is also easy to paint with acrylic paints or UreCoat™ flexible coating for applications requiring thick, durable finishes.
› Click here for more Smooth-Cast™ resin products.
Smooth‑Sil™ 960
Smooth-Sil™ 960 is a Shore 60A platinum cure silicone rubber developed for a variety of industrial applications. Compared to other 60A platinum silicones, Smooth-Sil™ 960 has a relatively low viscosity and is easy to mix, de-air and pour. Silicone cures in 16 hours with negligible shrinkage to a firm rubber with high tensile and tear strength.
Smooth-Sil™ 960 offers good chemical and heat resistance, making this a good choice for production casting of resins and expanding foams. Because of its firmness, Smooth-Sil™ 960 molds are also used for spin casting. It is also used for embedding and electrical applications. Smooth-Sil™ 960 is suitable for food related applications.
Note: This product will not cure against surfaces containing sulfur, even when sealed.