High-Anti-Yellowing Silica Felcosil- 800

Felcosil-800 is a high-anti-yellowing precipitated silica; its 10–14 µm, low-dust particles and 130-160 m²/g surface area deliver strong reinforcement. The low-iron formulation keeps HTV silicone rubber highly transparent, non-yellowing and heat-resistant, while just 30 phr quickly increases hardness and strength—ideal for clear keypads, seals and cable jackets.

Item NO.:
Felcosil-800
EINECS No:
238-878-4
CAS No.:
7631-86-9
Chemical Formula:
SiO2.nH2
Surface BET (m²/g):
130-160
Properties:
Transparency good reinforcing, High anti-yellowing

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High-Anti-Yellowing Silica Felcosil-800

High-Anti-Yellowing Precipitated Silica for high-temperature-vulcanized (HTV) silicone rubber.

Key Performance

BET 130-160 m²/g + D₅₀ 10-14 µm → rapid dispersion, low dust, high reinforcement
Fe ≤ 200 mg/kg & ≥ 98 % SiO₂ → outstanding transparency and anti-yellowing index
DBP 2.0-2.7 cm³/g, pH 6-7 → catalyst-neutral, smooth processing
Heat-stable to 300 °C short-term → ideal for bright-white or crystal-clear silicone parts

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 h % 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

Primary reinforcing filler for transparent, coloured or high-brightness HTV silicone rubber (keypads, seals, baby-nipples, oven gaskets).

Dosage: 20 – 60 phr; add directly with base polymer, no pre-drying under normal humidity (< 70 % RH).

Handling & Storage

Store in closed bags below 35 °C and < 70 % RH; avoid contact with strong alkalis or HF acid.

Packaging

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

For technical assistance or samples please contact our sales team.

SiO2, Precipitated Silica, White Carbon, Silicon Dioxide, Co

nventional Silica Powder, Amorphous Precipitated Silica, Micro pearl precipitated silica

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Subject : High-Anti-Yellowing Silica Felcosil- 800

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High-Anti-Yellowing Silica Felcosil- 800

High-Anti-Yellowing Silica Felcosil-800

High-Anti-Yellowing Precipitated Silica for high-temperature-vulcanized (HTV) silicone rubber.

Specifications

Application

High-Anti-Yellowing HTV Silica

Low-Iron Precipitated Silica

Transparent Silicone Rubber Additive

transparency good reinforcing silica

Non-Yellowing Silica Powder

Silicone Rubber grade Silica

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