Silica (also known as silicon dioxide) is an inorganic compound commonly used as a filler, thickener, and rheological agent. In liquid silicone rubber, silica serves several main purposes:

Increased viscosity of the silicone rubber: Silica can form a network structure in liquid silicone rubber, enhancing its stickiness and viscosity. This makes the silicone rubber adhere more easily to vertical surfaces and improves its coating performance.

Improved rheological properties of the silicone rubber: Silica can adjust the rheological properties of silicone rubber, allowing for better control and stability during processes such as coating and casting.

Enhanced mechanical properties of the silicone rubber: Serving as a filler, silica can strengthen the mechanical strength, wear resistance, and tear resistance of silicone rubber. This is crucial in applications requiring hardness and durability, such as seals, adhesives, and rubber products.

Improved thermal conductivity of the silicone rubber: Silica possesses good thermal conductivity. Therefore, adding silica can enhance the thermal conductivity of silicone rubber, making it more suitable for applications with high thermal conductivity requirements, such as thermal conductive silicone grease.

In summary, the application of silica in liquid silicone rubber can improve its rheological properties, mechanical performance, and thermal conductivity, making it suitable for various industrial and consumer product applications.