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Silicone-Rubber-Grade Felcosil-779-1
Silicone-Rubber-Grade Low-Iron Precipitated Silica (white carbon black) for high-temperature-vulcanized (HTV) silicone rubber.
Key Features
- Ultra-high surface area 150-180 m²/g for maximum reinforcement at low dosage
- Narrow 10-14 µm D₅₀ – low dust, fast dispersion, smooth rolling
- Low iron ≤ 200 mg/kg & ≥ 98 % SiO₂ – high electrical insulation, brilliant transparency and anti-yellowing
- Neutral pH 6-7, low salt – catalyst-friendly, extended compound shelf life
- Stable up to 300 °C short-term – suited for oven gaskets, keypad pads, cable jackets
Specifications
|
Items |
Specification |
|
Appearance |
White Powder |
|
BET specific surface area m2/g |
150-180 |
|
Salt As Na2SO4% Max |
0.7 |
|
SiO2 % Min |
98 |
|
Heating Loss at 105°C 2h% Max |
4.0-8.0 |
|
Ignition Loss at 1000°C % Max |
7.0 |
|
pH Value (10% aqueous suspension) |
6.0-7.0 |
|
DBP absorption Value cm³/g |
2.0-2.7 |
| Total Fe mg/kg Max | 200 |
|
Medium Size (D50)µm |
10-14 |
Application
Reinforcing filler for transparent, coloured or high-hardness HTV silicone rubber parts.
Typical addition: 20 – 60 phr; add together with base polymer, no pre-drying required under normal humidity (< 70 % RH).
Handling & Storage
Store in closed original bags below 35 °C and < 70 % RH; keep away from strong alkalis and HF.
Packaging
Net 10 kg / 20 kg multi-layer kraft bags with PE liner; big bags on request.
For samples or technical support please contact our sales team.
