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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 4,250 cps | 3,000 cps |
| Mix Ratio By Volume | 1A:1B | N/A (gram scale required) |
| Pot Life | 30 minutes | 20 minutes |
| Cure Time | 6 hours | 2 hours |
| Shore D Hardness | — | 85 |
| Shore A Hardness | 30 | — |
| Color | Lavender | Beige |
| Tensile Strength | 240 psi | 3,100 psi |
| Elongation @ Break | 250 % | 1 % |
| Shrinkage | 0.0025 in. / in. | 0.0006 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
| OOMOO™ 30 | Smooth-Cast™ 385 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 4,250 cps | 3,000 cps |
| Mix Ratio By Volume | 1A:1B | — |
| Mix Ratio By Weight | 100A:130B | 1A:5B |
| Pot Life | 30 minutes | 20 minutes |
| Cure Time | 6 hours | 2 hours |
| Shore D Hardness | — | 85 |
| Shore A Hardness | 30 | — |
| Specific Gravity | 1.34 g/cc | 1.60 g/cc |
| Specific Volume | 20.6 cu. in./lb. | 17.3 cu. in./lb. |
| Color | Lavender | Beige |
| Die B Tear Strength | 40 pli | — |
| Tensile Strength | 240 psi | 3,100 psi |
| Tensile Modulus | — | 400,000 psi |
| Elongation @ Break | 250 % | 1 % |
| 100% Modulus | 100 psi | — |
| Compressive Strength | — | 8,500 psi |
| Compressive Modulus | — | 400,000 psi |
| Flexural Strength | — | 5,900 psi |
| Flexural Modulus | — | 433,000 psi |
| Shrinkage | 0.0025 in. / in. | 0.0006 in. / in. |
| Heat Deflection Temp | — | 135 °F |
| Useful Temperature (min) | -65 °F | — |
| Useful Temperature (max) | 400 °F | — |
Product Description
OOMOO™ 30
No Vacuuming – No Scale – Easy To Use . . . OOMOO™ 30 is an easy to use tin cure silicone rubber compound that features a convenient one-to-one by volume mix ratio (no scale necessary). It has low viscosity for easy mixing and pouring . . . vacuum degassing is not necessary. This product cures at room temperature with negligible shrinkage. OOMOO™ 30 has a 30-minute pot life, with a six-hour cure time.
For The Novice Mold Maker - OOMOO™ silicones do not have great tear strength. They are good for making simple one- or two piece block molds. If you require a high-tear strength silicone, Mold Max™ silicones are recommended.
OOMOO™ 30 is suitable for a variety of art-related and industrial applications including making one and two-piece block molds for sculpture and prototype reproduction, casting plaster, resins and wax. OOMOO™ silicones are also suitable for electrical potting and encapsulation applications.
Smooth-Cast™ 385
Smooth-Cast™ 385 is a mineral filled urethane casting resin that is very hard and durable. When Parts A and B are mixed in proper proportion (1A:5B by weight), Smooth-Cast™ 385 cures at room temperature with virtually no shrinkage. This rigid urethane casting resin has high compressive and flexural strength. Fully cured castings are tough, machinable and paintable.
Color effects are possible by adding pigment dispersions. They resist moisture and mild solvents. Smooth-Cast™ 385 is ideal for making industrial production parts, foundry patterns, vacuum forming molds, and some ceramic applications