Basic silicone materials
Heat-expandable silicone rubber
Liquid Silicone Rubber
Liquid Silicone Rubber
Heat-expandable silicone rubber
Features
◇ Excellent fluidity;
◇ Excellent mechanical properties of the cured rubber;
◇ Low linear shrinkage, high dimensional accuracy, good hardness stability;
◇ Large coefficient of thermal expansion;
Typical Applications
◇ Soft mold forming of resin-based composite materials;
◇ Precision casting: such as drill bits, turbocharger impellers, etc.;
Typical Properties
| Item | Unit | Value | |||
| R-311W | R-10301 | ||||
| Before Curing | Appearance | A | Translucent or milky white paste | Translucent or milky white paste | |
| B | Red paste | Red paste | |||
| Specific Gravity, 23℃ | A | g/cm³ | 1.1 | 1.1 | |
| B | |||||
| Viscosity, after stirring at 23℃ | A | Pa.s | 100 | 20~40 | |
| B | |||||
| Mixing Ratio | A:B | 10:1 | 10:1 | ||
| Pot Life, 25℃ | h | 1 | 1 | ||
| After Curing | Tensile Strength | MPa | 4.5 | 4.0 | |
| Elongation | % | 300 | 300 | ||
| Tear Strength | kN/m | 12 | 10 | ||
| Shore A Hardness | 35~45 | 30~40 | |||
| Linear Shrinkage | % | 0.1 | 0.1 | ||
| Coefficient of Thermal Expansion | 1/℃ | 2.8×10⁻⁴ | 2.8×10⁻⁴ | ||
Instructions for Use
◇ Weighing: Weigh the appropriate proportion of components A and B according to the ratio
◇ Mixing: Thoroughly mix the two components, being careful to scrape the bottom and side walls of the mixing container.
◇ Degassing: To ensure that no bubble defects remain in the cured rubber, place the mixed compound together with its container in a vacuum degassing device and degas under vacuum. During vacuum degassing, the liquid level of the mixture may rise to 3-4 times the original volume before the bubbles automatically collapse. After the bubbles have collapsed, maintain the vacuum for 4-6 minutes, then release the vacuum.
◇ Potting: Pour the compound by hand or by machine.
◇ Molding: After the silicone rubber mold has cured at room temperature for 24h, treat it at 100℃ for 1h, and the mold is ready for use.
Product inquiry
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