Precipitated Silica results in the structuring of the silicone rubber, mainly based on a large number of hydrogen bonds between Precipitated Silica and high molecular weight polysiloxanes.

Reinforcing fillers for silicone rubber can be divided into reinforcing fillers and non-reinforcing fillers according to the reinforcing effect. The former has a diameter of 10~50nm and a specific surface area of ​​70~400m2/g. The effect is better; the latter is usually 300~10000nm, the specific surface area is below 30m2/g, and the reinforcement effect is poor.

The reinforcing filler used in silicone rubber mainly refers to synthetic Precipitated Silica, also known as Precipitated Silica. Precipitated Silica is divided into fumed Precipitated Silica and precipitated Silica.

Fumed Precipitated Silica

The size, specific surface area, surface properties and structure of fumed Precipitated Silica particles are related to the ratio of raw gas, combustion rate and residence time of SiO2 core in the combustion chamber.

The finer the fumed Precipitated Silica particles, the larger the specific surface area and the better the reinforcement effect, but the worse the performance. On the contrary, the particles are coarser, the specific surface area is smaller, and the enhancement effect is poor, but the operability is better.

Fumed Precipitated Silica is one of the most commonly used silicone rubber reinforcing agents. The rubber compound reinforced with it has high mechanical strength and good electrical properties after vulcanization. Fumed Precipitated Silica can be used in combination with other reinforcing agents or weak reinforcing agents to prepare rubber compounds with different application requirements.

SAI800 High Anti Yellowing Silica in Silicone Rubber

» Medium particle size: 10-14um and BET specific surface area 130-160 m²/g

SAI779-1 Reinforcing filler Silicone Rubber

» Medium particle size: 10-14um and BET specific surface area 150-180 m²/g

SAI779 Good Processing Precipitated Silica in Silicone Rubber

» Medium particle size: 10-14um and BET specific surface area 1120-160 m²/g