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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 80,000 cps | 6,000 cps |
| Mix Ratio By Volume | 1A:1B | N/A (gram scale required) |
| Pot Life | 2.5 hours | 90 minutes |
| Cure Time | 6 hours | 16 hours |
| Shore A Hardness | 30 | 12 |
| Specific Gravity | 1.08 g/cc | 1.38 g/cc |
| Color | Translucent | Black |
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™ | FMC™ 205 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 80,000 cps | 6,000 cps |
| Mix Ratio By Volume | 1A:1B | — |
| Mix Ratio By Weight | 1A:1B | 100A:12B |
| Pot Life | 2.5 hours | 90 minutes |
| Cure Time | 6 hours | 16 hours |
| Shore A Hardness | 30 | 12 |
| Specific Gravity | 1.08 g/cc | 1.38 g/cc |
| Specific Volume | — | 20.1 cu. in./lb. |
| Color | Translucent | Black |
| Tensile Strength | — | 60 psi |
| Elongation @ Break | 550 % | 550 % |
| 100% Modulus | — | 15 psi |
| Shrinkage | — | Negligible in. / in. |
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.
FMC™ 205
FMC™-205 is a polysulfide rubber mold compound that cures overnight with negligible shrinkage to a lasting durable rubber that will perform in production. The mix ratio is 100 parts of Part A to 12 parts of Part B by weight. FMC™-205 cures to a Shore hardness of 12 A.
FMC™-205 is ideal for those applications that require capturing intricate detail from a variety of model surfaces. Unlike polyurethanes, FMC™-205 is not sensitive to moisture and can be poured directly over wet plaster or water/sulfur based clays. Common applications include molds of sculpture (lost wax process), casting various gypsum products and waxes.