Abstract: Adhesives with a specific viscose component to provide good thermal conductivity, insulation and flame retardant and high temperature resistant is provided. The adhesive composition form may be single-sided or double-sided with a substrate or not. The substrate may be metal foil, glass fiber, thermal pad or organic polymers. Adhesive composition includes polymerized siloxane, metal hydroxides, and metal oxides. Nitrides, aluminum powder or coupling agent may be added. The coupling agent is specially used in non-silica resin substrate, which enhances the adhesion to substrate surface. Optionally, the adhesive may include a release film.