Smooth-Cast™ 305
- Chemical Family
- Polyurethanes (PU)Urethanes
Smooth-Cast™ 305 is 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.
Product families
- Polyurethanes
Other characteristics
- Brand
- Smooth-Cast
- Density
- 1050.0 - 1050.0 kg/m³
- End Uses
- Jewelry, Modeling Material, Prototyping
- Polymer Name
- Polyurethane (unspecified)
- Tensile Strength
- 20.67 - 20.67 MPa
- Processing Methods
- Casting
- Safety
Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Use only in a well-ventilated area.
- Markets
- Consumer Goods
- 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
- Material Features
- Durable
- Good Toughness
- Low Viscosity
- Machinable
- Moisture Resistant
- Paintable
- Solvent Resistant
- Prodcut Highlights
These resins readily accept fillers (such as URE-FIL™ 3 from Smooth-On) and can be colored with SO-Strong™, UVO™ 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.
Technical data
Table 1 of 1
16 rows| Characteristic | Value | Unit | Method |
|---|---|---|---|
| Pot Life at 73°F (23°C) | 7 | Minute | ASTM D-2471 |
| Cure Time at 73°F (23°C) | 30 | Minute | — |
| Tensile Strength | 3000 | psi | ASTM D-638 |
| Tensile Modulus | 134000 | psi | ASTM D-638 |
| Elongation at Break | 7.5 | % | ASTM D-638 |
| Flexural Strength | 4000 | psi | ASTM D-790 |
| Flexural Modulus | 118000 | psi | ASTM D-790 |
| Compressive Strength | 3800 | psi | ASTM D-695 |
| Compressive Modulus | 44900 | psi | ASTM D-695 |
| Shrinkage | 0.0065 | in./in. | ASTM D-2566 |
| Mix Ratio | 1A:1B (100A:90B) | by volume (by weight) | — |
| Mixed Viscosity | 80 | cps | ASTM D-2393 |
