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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 100 cps | 5,000 cps |
| Mix Ratio By Volume | 1A:1B | N/A (gram scale required) |
| Pot Life | 2.5 minutes | 3 hours |
| Barcol 935 Hardness | — | 93 |
| Shore D Hardness | 72 | — |
| Specific Volume | 25.9 cu. in./lb. | 18.22 cu. in./lb. |
| Color | Clear Amber | Black |
| Compressive Strength | 3,500 psi | 15,980 psi |
| Compressive Modulus | 36,500 psi | 134,000 psi |
| Flexural Strength | 3,690 psi | 10,850 psi |
| Flexural Modulus | 101,000 psi | 775,000 psi |
| Shrinkage | 0.01 in. / in. | 0.007 in. / in. |
| Heat Deflection Temp | 120 °F | 187 °F |
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 | EpoxAcast™ 650 BLACK + HT Hardener | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 100 cps | 5,000 cps |
| Mix Ratio By Volume | 1A:1B | — |
| Mix Ratio By Weight | 115A:100B | 100A:10B |
| Pot Life | 2.5 minutes | 3 hours |
| Cure Time | 10 minutes | Twenty Four Hours Followed By Post Cures |
| Barcol 935 Hardness | — | 93 |
| Shore D Hardness | 72 | — |
| Specific Gravity | 1.07 g/cc | 1.52 g/cc |
| Specific Volume | 25.9 cu. in./lb. | 18.22 cu. in./lb. |
| Color | Clear Amber | Black |
| Tensile Strength | 3,170 psi | — |
| Tensile Modulus | 140,000 psi | 1,079,000 psi |
| Ultimate Tensile | — | 6,900 psi |
| Tensile Elongation | — | 0.82 % |
| Elongation @ Break | 10 % | — |
| Compressive Strength | 3,500 psi | 15,980 psi |
| Compressive Modulus | 36,500 psi | 134,000 psi |
| Flexural Strength | 3,690 psi | 10,850 psi |
| Flexural Modulus | 101,000 psi | 775,000 psi |
| Shrinkage | 0.01 in. / in. | 0.007 in. / in. |
| Heat Deflection Temp | 120 °F | 187 °F |
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.
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EpoxAcast™ 650 BLACK + HT Hardener
EpoxAcast™ 650 Black is a mineral filled general purpose casting epoxy that is low cost and versatile. It features a low mixed viscosity for minimal bubble entrapment.EpoxAcast™ 650 Black is used for making hard dies for metal stamping as well as patterns and fixtures. It is also used for electrical encapsulation to extend the life cycles and enhance the performance of potted electronic devices. The high compressive strength of EpoxAcast™ 650 Black makes it ideal for making stamping dies for production pressing of metal ornaments.