The insulating material of the silicone wire is mainly high-performance silicone rubber. Its structural feature is that the main chain is alternately composed of silicon atoms and oxygen atoms, and the silicon atoms have two organic groups on the rubber. Ordinary silicone rubber is mainly composed of silicone chain links of methyl and a small amount of vinyl, and the improvement of high and low temperature resistance and oil resistance is mainly due to the introduction of phenyl, trifluoropropyl and cyano groups. Ordinary silicone rubber can withstand low temperature up to -55℃, after introducing phenyl group it can reach -73℃, and high temperature resistance can reach 200℃. Silicone rubber has good air permeability, and its oxygen transmission rate is the highest among synthetic polymers. In addition, silicone rubber has excellent physiological inertia, so its outstanding characteristics are not outstanding, which is one of the main reasons for its wide application in the medical field.