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Key Differences
| Product Type |
|
|
| Mixed Viscosity | 1,200 cps | 80 cps |
| Pot Life | 13 minutes | 7 minutes |
| Cure Time | 24 hours | 30 minutes |
| Shore D Hardness | — | 70 |
| Shore A Hardness | 80 | — |
| Color | Translucent | White |
| Tensile Strength | 955 psi | 3,000 psi |
| Elongation @ Break | 127 % | 7.5 % |
| Shrinkage | 0.0014 in. / in. | 0.0065 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
| Econ™ 80 | Smooth-Cast™ 305 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 1,200 cps | 80 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 100A:90B | 100A:90B |
| Pot Life | 13 minutes | 7 minutes |
| Handling Time | 6 hours | — |
| Cure Time | 24 hours | 30 minutes |
| Shore D Hardness | — | 70 |
| Shore A Hardness | 80 | — |
| Specific Gravity | 1.06 g/cc | 1.05 g/cc |
| Specific Volume | 26.16 cu. in./lb. | 26.4 cu. in./lb. |
| Color | Translucent | White |
| Die C Tear Strength | 77 pli | — |
| Tensile Strength | 955 psi | 3,000 psi |
| Tensile Modulus | — | 134,000 psi |
| Elongation @ Break | 127 % | 7.5 % |
| 100% Modulus | 670 psi | — |
| Compressive Strength | — | 3,800 psi |
| Compressive Modulus | — | 44,900 psi |
| Flexural Strength | — | 4,000 psi |
| Flexural Modulus | — | 118,000 psi |
| Shrinkage | 0.0014 in. / in. | 0.0065 in. / in. |
| Heat Deflection Temp | — | 120 °F |
Product Description
Econ™ 80
Econ™ 80 is an economical Shore 80A urethane rubber suitable for a variety of mold making and industrial applications. It is a lower cost, faster cure alternative to our popular PMC™-780. Physical properties are lower vs. PMC™-780. This is a no odor system that features a 1A:1B mix ratio and a low viscosity for easy mixing and pouring. Working time is about 13 minutes at room temperature, handling time is 6 hours and rubber cures overnight. Econ™ 80 is translucent and easily colored with SO-Strong™ or Ignite™ colorants. Econ™ 80 is used to make short run molds for casting concrete and resins, concrete stamping pads, rubber mechanical parts, coating fabrics, pour-in-place gaskets for industrial equipment and burial vaults. Important: To minimize air bubbles in cured rubber, vacuum degassing is recommended.
FOR COMMERCIAL/INDUSTRIAL USE ONLY
Smooth-Cast™ 305
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.