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Silicone-rubber-grade silica Felcosil-779

Felcosil-779: low-dust, 10–14 µm particles with 130–160 m²/g surface area deliver high reinforcement for stronger, clearer, heat-resistant HTV silicone rubber.

Item NO.:
Silicone-rubber-grad
EINECS No:
238-878-4
CAS No.:
7631-86-9
Chemical Formula:
SiO2.nH2
Surface BET (m²/g):
130-160
Properties:
Felcosil-779: low-dust, 10–14 µm particles with 130–160 m²/g surface area deliver high reinforcement for stronger, clearer, heat-resistant HTV silicone rubber.

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Product Detail
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Silicone-rubber-grade silica Felcosil-779

Silicone-rubber-grade precipitated silica (white carbon black) engineered for high-temperature vulcanized (HTV) silicone rubber.

Key Features

• Medium particle size D₅₀ 10–14 µm → low dust, fast dispersion, reduced roller sticking

• BET surface area 130–160 m²/g → high reinforcement at low loading

• High clarity & anti-yellowing → suited for transparent/coloured articles

• Low iron (< 200 mg/kg) & ≥ 98 % SiO₂ → excellent electrical insulation and heat stability (up to 300 °C short-term)

• Neutral pH 6–7 & low salt content → protects catalyst activity, extends shelf life

Specifications

Items	Specification
Appearance	White Powder
BET specific surface area m²/g	130-160
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 2h% Max	7.0
pH Value (5% 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

Recommended Application

• Reinforcing filler for HTV silicone rubber compounds (gaskets, keypads, oven seals, cable jackets)

• Dosage : 20–60 phr (parts per hundred rubber) depending on hardness & transparency target

• Processing : add together with base polymer; no pre-drying required under normal humidity (< 70 % RH)

Handling & Storage:

Store in original closed bags below 35 °C and < 70 % relative humidity; avoid direct sunlight and contact with strong alkalis or HF.

Packaging:

Net 10 kg / 20 kg multi-layer kraft bags with PE liner; big bags available on request.

For additional technical assistance or sample requests please contact our sales office

SiO2, Precipitated Silica, White Carbon, Silicon Dioxide, Conventional Silica Powder, Micro pearl precipitated silica

Silicone-rubber-grade silica Felcosil-779

1. Package: 10 kg/bag.

2. Storage: Kept in a low temperature, dry and ventilated place, avoid direct sunlight.

3. Shelf life: One year in ventilating, cool and dry area.

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