By adding groups to a polysiloxane, it is possible to create a silicon-based organomodified molecule. If the organic group is able for further chemical reactions (e.g. polymerisation) the organomodified siloxane is also called organoreactive siloxane. The chemical combination of the organic groups attached to the polysiloxane backbone leads to products with outstanding chemical and physical properties.

This organomodified silicon-based molecule can be made to any size. Any number of reactive groups can be designed into it. In many cases, the organic groups are separated from the silicon by a three-carbon chain. This chain separates the organic reactivity from the effects of the silicon.

Organic groups can be attached to polysiloxanes in a number of ways: Pendant to the polysiloxane backbone, at both ends of the polysiloxane chain and at one end of the polysiloxane chain.

In cases where the organic groups are still chemically reactive (organoreactive siloxanes), additional processing steps can be carried out in order to generate the final product.