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.
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