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Key Differences
| Mixed Viscosity | 280 cps | 7,000 cps |
| Pot Life | 5 hours | 90 minutes |
| Cure Time | 24 hours | 4 hours |
| Barcol 935 Hardness | — | 93 |
| Shore D Hardness | 80 | — |
| Specific Volume | 25 cu. in./lb. | 18.22 cu. in./lb. |
| Color | Clear | Off White |
| Tensile Modulus | 572,000 psi | 1,503,000 psi |
| Tensile Elongation | 1.8 % | 0.42 % |
| Compressive Strength | 9,610 psi | 16,350 psi |
| Compressive Modulus | 91,300 psi | 142,600 psi |
| Flexural Strength | 10,980 psi | 5,890 psi |
| Flexural Modulus | 410,000 psi | 710,000 psi |
| Shrinkage | 0.002 in. / in. | 0.001 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
| EpoxAcast™ 690 | EpoxAcast™ 650 + 102 Hardener | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 280 cps | 7,000 cps |
| Mix Ratio By Weight | 100A:30B | 100A:13B |
| Pot Life | 5 hours | 90 minutes |
| Cure Time | 24 hours | 4 hours |
| Barcol 935 Hardness | — | 93 |
| Shore D Hardness | 80 | — |
| Specific Gravity | 1.10 g/cc | 1.52 g/cc |
| Specific Volume | 25 cu. in./lb. | 18.22 cu. in./lb. |
| Color | Clear | Off White |
| Tensile Strength | 6,630 psi | — |
| Tensile Modulus | 572,000 psi | 1,503,000 psi |
| Ultimate Tensile | — | 6,000 psi |
| Tensile Elongation | 1.8 % | 0.42 % |
| Compressive Strength | 9,610 psi | 16,350 psi |
| Compressive Modulus | 91,300 psi | 142,600 psi |
| Flexural Strength | 10,980 psi | 5,890 psi |
| Flexural Modulus | 410,000 psi | 710,000 psi |
| Shrinkage | 0.002 in. / in. | 0.001 in. / in. |
| Heat Deflection Temp | 115 °F | 129 °F |
| Index of Refraction at 20°C | 1.565 | — |
Product Description
EpoxAcast™ 690
EpoxAcast™ 690 is an UV resistant clear casting epoxy resins suitable for a variety of industrial and art related projects requiring a rigid, clear finished casting. EpoxAcast™ 690 features a very low viscosity for easy mixing and minimal bubble entrapment. Castings cure with negligible shrinkage and are very hard and strong. Resin can be colored with UVO™ or IGNITE™ colorants. Cast Magic™ and Glow Worm™ powders can also be added to create amazing casting effects.
EpoxAcast™ 650 + 102 Hardener
EpoxAcast™ 650 is a mineral filled general purpose casting epoxy resin that is low cost and versatile. It features a low mixed viscosity for minimal bubble entrapment.