Polymethyl silicone resin is generally a copolymer composed of siloxane chain units such as SiO3/2, CH3SiO3/2, (CH3)3SiO2/2, (CH)SiO1/2. Using raw materials with only two or less methyl groups attached to each silicon atom (such as methyltrichlorosilane, dimethyldichlorosilane), a polymethylsiloxane resin with a network structure can be obtained, which can be converted into Insoluble infusible product.
