The solvent-based, liquid resin and emulsion silicone resins used in high temperature resistant coatings are mainly methyl silicone resins and methyl - phenyl silicone resins. Coatings made from organic silicone resins containing only phenyl groups are thermoplastic and can only be used in a niche, not suitable for wide use. Methylorganosilicone is polymethylsiloxane, the lowest organic group content. Prepared as varnishes, their long-term heat resistance is between 180-200℃, but this is not common. By adding inorganic pigments, such as aluminum powder, mica or iron oxide black, the temperature stability of colored paint can be increased to 600℃.
Long-term exposure to high temperatures usually results in complete oxidation of the methyl group, leaving the SiO2 skeleton. This chemical similarity to silica structure may partly account for the inorganic properties of such resins. Commercially, methyl silicone resins are mainly supplied as solvent-based products.