Silicone adhesive is divided into methyl type and phenyl modified type according to chemical structure. It consists of silicone raw rubber and a resin which is usually MQ resin (polycondensate of water glass and trimethylchlorosilane). It is a linear polysiloxane which is a continuous phase in which the side methyl group can be partially substituted by a phenyl group. The raw rubber and the resin are dissolved in the solvent, and they are chemically reacted with each other by condensation between the hydroxyl groups.
 
The silicone pressure-sensitive adhesive developed by Merrill et al. can bond low-energy surfaces and glue high-energy surfaces. It can resist chemical solvents and has a long service life. It can be used between -74 and 296 °C and can bond a variety of materials. Phenyl type pressure sensitive adhesive has high bonding strength at high temperature of 260 ° C and low temperature of -73 ° C. It has high viscosity, high peel strength and high adhesion. Methyl type pressure sensitive adhesive tends to lose viscosity at high viscosity. Attached. Phenyl type adhesives are widely used in automotive, aircraft, and electrical insulation.

Silicone pressure sensitive adhesives can be glued to a variety of difficult-to-bond materials such as untreated polyolefins, fluoroplastics, polyimides, and polycarbonates. They have been successfully used for the bonding of Alaska oil pipelines. It is also used in the manufacture of glass cloth adhesive tapes, mica insulation tapes, etc., and is widely used in automotive, shipbuilding processes, electrical insulation of generators and motors, masking of chemical etching processes, gas shielding and chemical shielding.