When adding fumed silica to RTV silicone rubber, attention must be paid to its degree of dispersion in the polymer. After the dispersion process is stopped, the best dispersed fumed silica will form a complete network in the system, with high viscosity and excellent thixotropic characteristics. When the adhesive is subjected to shear force, the viscosity will decrease significantly, showing a certain fluidity, and the viscosity will recover quickly after the shear force is lifted. If the dispersion is insufficient or excessive, only part of the fumed silica network will be formed, resulting in lower viscosity and poor thixotropic properties. In a transparent system, the higher the transmittance, the better the dispersion of white carbon black. Under the same dispersion conditions, products containing larger specific surface areas of fumed silica generally have better transparency.

Fluoro Silicone Gum, plz check MY 110-F series