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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 80,000 cps | 3,000 cps |
| Mix Ratio By Volume | 1A:1B | N/A (gram scale required) |
| Pot Life | 2.5 hours | 20 minutes |
| Cure Time | 6 hours | 2 hours |
| Shore D Hardness | — | 85 |
| Shore A Hardness | 30 | — |
| Specific Gravity | 1.08 g/cc | 1.60 g/cc |
| Color | Translucent | Beige |
| Elongation @ Break | 550 % | 1 % |
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
| Si-Tac™ | Smooth-Cast™ 385 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 80,000 cps | 3,000 cps |
| Mix Ratio By Volume | 1A:1B | — |
| Mix Ratio By Weight | 1A:1B | 1A:5B |
| Pot Life | 2.5 hours | 20 minutes |
| Cure Time | 6 hours | 2 hours |
| Shore D Hardness | — | 85 |
| Shore A Hardness | 30 | — |
| Specific Gravity | 1.08 g/cc | 1.60 g/cc |
| Specific Volume | — | 17.3 cu. in./lb. |
| Color | Translucent | Beige |
| Tensile Strength | — | 3,100 psi |
| Tensile Modulus | — | 400,000 psi |
| Elongation @ Break | 550 % | 1 % |
| Compressive Strength | — | 8,500 psi |
| Compressive Modulus | — | 400,000 psi |
| Flexural Strength | — | 5,900 psi |
| Flexural Modulus | — | 433,000 psi |
| Shrinkage | — | 0.0006 in. / in. |
| Heat Deflection Temp | — | 135 °F |
Product Description
Si-Tac™
Si-Tac™ is a two-part pourable liquid silicone adhesive that is applied to natural or synthetic fabric/clothing for the purpose of keeping sports or leisure wear in place during exercise. Garments will not shift or fall. Si-Tac™ can be mixed and applied by hand, but is also often meter mix dispensed and delivered to the garment surface at strategic points through a narrow static mixing tube before being quickly heat cured. Certified Skin Safe, cured rubber is soft, comfortable and flexes with every movement; never noticed by the wearer.
Si-Tac™ silicone performs over a wide temperature range, is very strong, sweat resistant and lasts through many laundering cycles.
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