Smooth-Cast® 385
- Chemical Family
- Polyurethanes (PU)Urethanes
Smooth-Cast® 385 is a mineral filled urethane casting resin that is very hard and durable. When Parts A and B are mixed in proper proportion (1A:5B by weight), Smooth-Cast™ 385 cures at room temperature with virtually no shrinkage. This rigid urethane casting resin has high compressive and flexural strength. Fully cured castings are tough, machinable and paintable. Color effects are possible by adding pigment dispersions. They resist moisture and mild solvents. Smooth-Cast™ 385 is ideal for making industrial production parts, foundry patterns, vacuum forming molds, and some ceramic applications.
Product families
Applications
- Other Industrial Applications
- Tooling & Moldmaking
Product Families
- Polyurethanes
Other characteristics
- Brand
- Smooth-Cast
- Density
- 1600.0 - 1600.0 kg/m³
- End Uses
- Foundry Dressings, Industrial Parts, Mold Making
- Polymer Name
- Polyurethane (unspecified)
- Processing Methods
- Casting
- Markets
- Industrial
- Shelf LIfe
Shelf life of product is reduced after opening. Remaining product should be used as soon as possible. Immediately replacing the lids on both containers after dispensing product will help prolong the shelf life of the unused product. XTEND-IT™ Dry Gas Blanket (available from Smooth-On) will significantly prolong the shelf life of unused liquid urethane products
- Technology
- Plastics
- Fillers Included
- Mineral
- Material Features
- Durable
- Good Compressive Strength
- Good Toughness
- High Flexural Modulus
- High Hardness
- Machinable
- Moisture Resistant
- Paintable
- Measuring and Mixing
Mixing - Shake Part A and stir Part B thoroughly before dispensing. After dispensing required amounts of Parts A and B into mixing container, mix thoroughly. Stir slowly and deliberately, making sure that you scrape the sides and bottom of the mixing container several times. If vacuum vegassing, subject mixture to 29 inches mercury for 3 minutes or until mixture rises and falls.
Technical data
Table 1 of 1
16 rows| Characteristic | Value | Unit | Method |
|---|---|---|---|
| Mix Ratio | 1A:5B | by weight | — |
| Mixed Viscosity | 3000 | cps | ASTM D-2393 |
| Specific Gravity | 1.6 | g/cc | ASTM D-1475 |
| Specific Volume | 17.3 | cu. in. /lb. | ASTM D-1475 |
| Pot Life at 73°F (23°C) | 20 | Minute | ASTM D-2471 |
| Demold Time at 73°F (23°C) | 2 | Hr | — |
| Hardness | 85 | Shore D | ASTM D-2240 |
| Ultimate Tensile | 3100 | psi | ASTM D-638 |
| Tensile Modulus | 4,00,000 | psi | ASTM D-638 |
| Elongation at Break | 1 | 5 | ASTM D-638 |
| Flexural Strength | 5900 | psi | ASTM D-790 |
| Flexural Modulus | 4,33,000 | psi | ASTM D-790 |
