Description: Maximize your mold life with our industrial-grade, heat-resistant RTV-2 silicone. Specially formulated for the casting of low-melt alloys, this rubber withstands the thermal shock of molten metal (up to 300°C / 572°F) without becoming brittle or degrading.
Whether you are spin-casting zinc alloy miniatures or gravity-pouring lead fishing sinkers, our silicone offers the perfect balance of heat dissipation and tear strength. It cures to a tough, reddish-brown rubber that resists “mold burnout,” ensuring consistent detail reproduction over hundreds of casting cycles.
Key Features:
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Extreme Heat Resistance: Withstands intermittent exposure to molten temperatures of tin, pewter, lead, and bismuth alloys (up to 300°C).
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High Tear Strength: Shore A 40-50 hardness prevents tearing when demolding rigid metal parts or during high-speed spin casting.
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Low Oil Bleed: Formulated to prevent oil from leaching out under heat, reducing porosity and defects in the cast metal surface.
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Dimensional Stability: Minimal shrinkage ensures that metal parts retain precise weight and dimensions.
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Long Mold Life: Superior resistance to heat aging means you get more casts per mold before the rubber begins to crack.
Applications:
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Spin casting of white metal miniatures and jewelry
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Gravity casting of lead fishing lures and sinkers
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Pewter figurines and collectibles
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Rapid prototyping of metal parts
| Item | Color | Viscosity (mPa·s) | Hardness (Shore A) | Tensile Strength (MPa) | Elongation at Break % | Tear Strength (N/mm²) | Linear Shrinkage % |
| YS805 | White/translucnet | 12000±2000 | 5±2 | ≥1.5 | ≥550 | ≥8 | ≤0.3 |
| YS810 | White/translucent | 14000±2000 | 10±2 | ≥1.9 | ≥500 | ≥13 | ≤0.3 |
| YS815 | White/translucent | 16000±2000 | 15±2 | ≥2.1 | ≥500 | ≥17 | ≤0.3 |
| YS820 | White/translucent | 20000±2000 | 20±2 | ≥2.5 | ≥450 | ≥22 | ≤0.3 |
| YS825 | White/translucent | 21000±2000 | 25±2 | ≥3.0 | ≥450 | ≥23 | ≤0.3 |
| YS830 | White/translucent | 22000±2000 | 30±2 | ≥3.5 | ≥350 | ≥23 | ≤0.3 |
| YS835 | White/translucent | 22000±2000 | 35±2 | ≥3.5 | ≥310 | ≥22 | ≤0.3 |
| YS840 | White/translucent | 22000±2000 | 40±2 | ≥4.0 | ≥310 | ≥20 | ≤0.3 |
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