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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 100 cps | 350,000 cps |
| Pot Life | 2.5 minutes | 6 hours |
| Shore D Hardness | 72 | — |
| Shore A Hardness | — | 30 |
| Color | Clear Amber | Translucent |
| Tensile Strength | 3,170 psi | 900 psi |
| Elongation @ Break | 10 % | 750 % |
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™ 325 | Si-Tac™ II | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 100 cps | 350,000 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 115A:100B | 1A:1B |
| Pot Life | 2.5 minutes | 6 hours |
| Cure Time | 10 minutes | — |
| Shore D Hardness | 72 | — |
| Shore A Hardness | — | 30 |
| Specific Gravity | 1.07 g/cc | 1.1 g/cc |
| Specific Volume | 25.9 cu. in./lb. | — |
| Color | Clear Amber | Translucent |
| Die B Tear Strength | — | 220 pli |
| Tensile Strength | 3,170 psi | 900 psi |
| Tensile Modulus | 140,000 psi | — |
| Elongation @ Break | 10 % | 750 % |
| Compressive Strength | 3,500 psi | — |
| Compressive Modulus | 36,500 psi | — |
| Flexural Strength | 3,690 psi | — |
| Flexural Modulus | 101,000 psi | — |
| Shrinkage | 0.01 in. / in. | — |
| Heat Deflection Temp | 120 °F | — |
| Useful Temperature (min) | — | -65 °F |
| Useful Temperature (max) | — | 450 °F |
| Cure Time @ 180 °F / 82 °C | — | 5 minutes |
| Cure Time @ 250 °F / 121 °C | — | 20 seconds |
Product Description
Smooth-Cast™ 325
The Smooth-Cast™ 325, 326 & 327 ColorMatch™ Series plastics are urethane resins that were developed specifically for adding color pigments and fillers to achieve true color representation or filler effect. The ColorMatch™ Series is formulated “color neutral”. Small amounts of pigment will yield accurate, vivid colors from cured castings using So-Strong™ tints, UVO™ pigments or Ignite™ color pigments. The ColorMatch™ Series offers the convenience of a 1A: 1B mix ratio by volume and has a very low viscosity. Demold times range from about 10 minutes to 2-4 hours (depending on product, mass and mold configuration). Note: Large mass castings will get very hot and shrink more, depending on mold configuration.
The ColorMatch™ Series also readily accept fillers (such as URE-FIL™ 3 from Smooth-On). Because of its neutral color, Smooth-Cast™ 325 is ideal for creating marble and wood grain casting effects, or duplicating the look of real metal by adding bronze, brass or other metal powder. Applications for the ColorMatch™ Series plastics include making pigmented prototype models or figures, special effect props, reproducing small to medium size sculptures, decorative jewelry, etc.
› Click here for more Smooth-Cast™ resin products.
Si-Tac™ II
Si-Tac™ II is a skin-safe silicone adhesive applied to natural or synthetic fabrics for the purpose of holding garments in place during normal wear or heavy exercise. It features exceptional adhesive properties, very high tensile strength and wear resistance. Withstands repeated laundering. Si-Tac II can be hand mixed, mechanically mixed and applied or dispensed through meter-mix equipment in production.