1. Tightly bond and disperse stress
Silicon dioxide has a high specific surface area and high activity characteristics, just like having countless "little hooks". When it is added to high-temperature vulcanized silicone rubber, these "little hooks" can produce strong physical adsorption and chemical bonding with the silicone rubber molecular chains. When silicone rubber is subjected to external forces, silica particles can evenly disperse stress. Imagine that silicone rubber is a large net, and silica is a solid anchor distributed on the large net. When external forces pull the large net, the anchors disperse the force to avoid stress concentration in a certain place, thereby preventing the rubber molecular chain from breaking prematurely, greatly improving the tensile strength and tear strength of silicone rubber.

2. Build a network and stabilize the structure
Silicon dioxide particles in silicone rubber are like engineers who build bridges. They connect silicone rubber molecular chains to form a three-dimensional network structure. This network structure limits the relative sliding of molecular chains, allowing silicone rubber to better maintain its shape and structural integrity when subjected to force. Just like the steel bars in reinforced concrete, which provide support and strength for concrete, the network structure constructed by silica also greatly improves the overall strength of silicone rubber.