Smooth Cast 380

SKU: 799768

Size: Pint Kit
Sale price$28.95

unit(s) in Stock.


unit(s) in Stock.

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* If unit(s) in stock is 0, item is currently unavailable or special order.


Unit Size Net Weight
Pint Kit 2 lb
Gallon Kit 18 lb



Smooth-Cast¨ 380 is a filled, high density casting resin formulated for a variety of tooling applications. This no-odor resin features a convenient 1A:1B mix ratio by volume, a 6 minute pot-life and cure time of about 60 minutes depending on mass and temperature.
Low viscosity ensures minimal bubble entrapment and long term shrinkage of cured resin is very low. Cured material is very strong and can be machined, drilled, sanded, etc. Color can be added with SO-Strong¨ color tints.
Technical Properties
Mix Ratio by Weight 1A:1B
Mix Ratio by Volume 1A:1B
Pot Life 6 minutes
Tack Free Time 60 minutes
Color Tan
Shore Hardness 82D
Mixed Viscosity 1,140 cps
Shrinkage 0.00025 in./in.
Specific Volume 15.9 cu. in./lb.
Specific Gravity 1.74g/cc
Tensile Strength 3,550 psi
Elongation @ Break 1.43%
Compressive Modulus 126,000 psi
Tensile Modulus 490,000 psi
Flexural Strength 4,870 psi
Flexural Modulus 315,000 psi
Compressive Strength 7,860 psi
Heat Deflection Temp 125¼F


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.
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