Description
| Unit Size | Net Weight |
| Pint Kit | 1.9 lb |
| Gallon Kit | 15.4 lb |
| Five Gallon Kit | 77 lb |
Smooth Cast 321 is a medium-setting ultra-low viscosity casting resin that yields virtually bubble-free castings. Smooth Cast 321 Series resins yield castings that are off-white and are sister products to our popular Smooth Cast 300 Series of Bright White Plastics.
Properties
Technical Properties
| Mix Ratio by Weight | 100A:90B |
| Mix Ratio by Volume | 1A:1B |
| Pot Life | 9 minutes |
| Cure Time | 30 minutes |
| Color | Off White |
| Shore Hardness | 70D |
| Mixed Viscosity | 80 cps |
| Shrinkage | 0.007 in./in. |
| Specific Volume | 26.4 cu. in./lb. |
| Specific Gravity | 1.05g/cc |
| Tensile Strength | 3,000 psi |
| Elongation @ Break | 8% |
| Compressive Modulus | 40,300 psi |
| Tensile Modulus | 138,000 psi |
| Flexural Strength | 3,500 psi |
| Flexural Modulus | 110,000 psi |
| Compressive Strength | 3,550 psi |
| Heat Deflection Temp | 140¼F |
Smooth Cast 321 Series resins are easier to color and tint using SO-Strong color tints. Easy to mix and pour these resins offer the convenience of a one to one mix ratio (one part A to one part B by volume). The Smooth Cast 321 Series resins readily accept pigments and fillers (such as URE-FIL 3, 5 and 7 from Smooth-On). These products are ideal for creating cold cast metal effects. Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth Cast 321 Series resins include: reproducing small to medium size sculptures, cold cast bronze, making prototype models, special effect props, decorative jewelry, etc.
How do I remove release agent from my cured urethane casting if I want to prime or paint the casting?
Removing a silicone-based release agent from your cured urethane casting is not easy. The most effective way is to sand blast or bead blast the surface of your casting. However, sand blasting removes a micro thin layer of the castingÕs surface. If not done properly, you can damage or remove fine detail. Soap Wipe or brush the casting with a soap that has high alkali content. Cascade brand dishwashing gel is highly alkaline and also contains baking soda, which is an advantage. Solvents Wipe or brush the casting with Acetone, Toluene, Isopropyl Alcohol or Mineral Spirits.
Important: follow all safety precautions when using flammable liquids. You can then prime and paint your casting.
Documentation
Related Products
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