Silicone sealants are generally polysiloxanes, i.e. a silicon-oxygen chain to which organic groups such as methyl groups can be attached.
Silicone sealants polymerize at room temperature under the action of humidity and are called RTV sealants.
We can distinguish 3 main families of RTV silicones (for Room Temperature Vulcanization) according to the nature of the products released during cross-linking: