Felcosil-779 Silica for Silicone Rubber Compounder

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

It is widely used by silicone rubber compounders and silicone product manufacturers to achieve superior mechanical properties, outstanding transparency, and reliable processing performance.

Item NO.:
Felcosil-779
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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Silicone rubber grade precipitated silica (white carbon black) engineered for high-temperature vulcanized (HTV) silicone rubber.

It is widely used by silicone rubber compounders and silicone product manufacturers to achieve superior mechanical properties, outstanding transparency, and reliable processing performance.

Specifications

Items	Specification
Appearance	White Powder
BET specific surface area m²/g	160-180
Salt As Na₂SO₄% Max	0.5
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	6-10

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)

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

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Felcosil-779 Silica for Silicone Rubber Compounder

Specifications

HTV silicone-rubber reinforcement

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Silica for Silicone Rubber Compounder

Anti-yellowing silica additive

Silicone Rubber Grade Silica

SILICA for rubber compound

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