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Key Differences
| Product Type |
|
|
| Mixed Viscosity | Brushable | 80 cps |
| Pot Life | 20 minutes | 30 seconds |
| Cure Time | 16 hours | 5 minutes |
| Shore D Hardness | — | 70 |
| Shore A Hardness | 50 | — |
| Color | Off White | White |
| Tensile Strength | 500 psi | 3,000 psi |
| Elongation @ Break | 400 % | 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
| Brush-On™ 50 | Smooth-Cast™ 300Q | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | Brushable | 80 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 100A:125B | 100A:90B |
| Pot Life | 20 minutes | 30 seconds |
| Cure Time | 16 hours | 5 minutes |
| Shore D Hardness | — | 70 |
| Shore A Hardness | 50 | — |
| Specific Gravity | 1.17 g/cc | 1.05 g/cc |
| Specific Volume | 23.7 cu. in./lb. | 26.4 cu. in./lb. |
| Color | Off White | White |
| Die C Tear Strength | 80 pli | — |
| Tensile Strength | 500 psi | 3,000 psi |
| Tensile Modulus | — | 139,500 psi |
| Elongation @ Break | 400 % | 5 % |
| Compressive Strength | — | 4,000 psi |
| Compressive Modulus | — | 45,800 psi |
| Flexural Strength | — | 4,510 psi |
| Flexural Modulus | — | 128,000 psi |
| Shrinkage | <.001 in. / in. | 0.01 in. / in. |
| Heat Deflection Temp | — | 120 °F |
Product Description
Brush-On™ 50
Smooth-On’s Brush-On™ Series of mold rubbers are extremely versatile and are famous for their abrasion resistance and high tear strength. They have the convenience of a one-to-one mix ratio and are easy to mix and apply with a brush or spatula.
Smooth-Cast™ 300Q
Smooth-Cast™ 300Q liquid plastic is a quick setting, ultra-low viscosity casting resin that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. It offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio.
This resin 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. It resists moisture and mild solvents. Applications for Smooth-Cast™ 300Q Liquid Plastics include reproducing small to medium size sculptures, casting into alginate molds, making prototype models, special effect props and decorative jewelry.
Those interested in making roto cast pieces should refer to the Smooth-Cast™ 65D technical bulletin.