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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 2,000 cps | 80 cps |
| Cure Time | 48 hours | 4 hours |
| Shore D Hardness | — | 70 |
| Shore A Hardness | 80 | — |
| Color | Light Amber | White |
| Tensile Strength | 900 psi | 3,000 psi |
| Elongation @ Break | 750 % | 7.5 % |
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
| PMC™-780 WET | Smooth-Cast™ 310 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 2,000 cps | 80 cps |
| Mix Ratio By Volume | 2A:1B | 1A:1B |
| Mix Ratio By Weight | 2A:1B | 100A:90B |
| Pot Life | 25 minutes | 20 minutes |
| Cure Time | 48 hours | 4 hours |
| Shore D Hardness | — | 70 |
| Shore A Hardness | 80 | — |
| Specific Gravity | 1.02 g/cc | 1.05 g/cc |
| Specific Volume | 27.2 cu. in./lb. | 26.4 cu. in./lb. |
| Color | Light Amber | White |
| Die C Tear Strength | 200 pli | — |
| Tensile Strength | 900 psi | 3,000 psi |
| Tensile Modulus | — | 134,000 psi |
| Elongation @ Break | 750 % | 7.5 % |
| 100% Modulus | 400 psi | — |
| Compressive Strength | — | 3,800 psi |
| Compressive Modulus | — | 44,900 psi |
| Flexural Strength | — | 4,000 psi |
| Flexural Modulus | — | 118,000 psi |
| Shrinkage | <.001 in. / in. | 0.0065 in. / in. |
| Heat Deflection Temp | — | 120 °F |
Product Description
PMC™-780 WET
PMC™-780 is a premium performance urethane rubber that offers exceptional strength, durability and abrasion resistance. PMC™-780 DOES NOT CONTAIN MOCA – a known cancer causing agent and hazard. Mixed two parts A to one part B by weight or volume, PMC™-780 urethane pours easily and cures at room temperature with negligible shrinkage to a solid Shore 80A rubber.
Smooth-Cast™ 310
The Smooth-Cast™ 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. They offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio. The differences between them are pot life and demold time.
These resins readily accept fillers (such as URE-FIL™ 3 from Smooth-On) and can be colored with SO-Strong™ or Ignite™ color tints (Smooth-Cast™ 325 series accepts pigments better than the Smooth Cast™ 300 series). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast™ 300 Series Liquid Plastics include reproducing small to medium size sculptures, making prototype models, special effect props and decorative jewelry.