Silicone-Rubber-Grade Felcosil-779-1

Felcosil-779-1 gives HTV silicone rubber high transparency, extra hardness and superior reinforcement while keeping the compound bright and non-yellowing.

Item NO.:
Felcosil-779-1
EINECS No:
238-878-4
CAS No.:
7631-86-9
Chemical Formula:
SiO2.nH2
Surface BET (m²/g):
150-180
Properties:
Felcosil-779-1 – Silicone-Rubber-Grade Low-Iron Precipitated Silica • D₅₀ 10–14 µm, BET 150–180 m²/g → rapid dispersion, low dust • ≥98 % SiO₂, Fe ≤200 mg/kg → high clarity & insulation, anti-yellowing • DBP 2.0–2.7 cm³/g, pH 6–7 → easy processing, extended shelf-life • Heat-proof up to 300 °C short-term → ideal for HTV silicone rubber

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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