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Polymethylsilsesquioxane

Harm score: 3 (Harmless chemicals)


Polymethylsilsesquioxane, sometimes also referred to as polyisobutylene or butyl rubber, is a synthetic polymer that is formed by a reaction between silicon and carbon. Known for its resistance to temperature, chemicals and weathering, it is found in many products where it plays the role of both a physical property modifier and a protective ingredient.

In cosmetics and skin care, polymethylsilsesquioxane is a popular ingredient in many products due to its ability to form a thin film on the surface of the skin, thus protecting it while giving it a smooth feel. It is also found in make-up products such as powders, which give them a silky, velvety texture and a long-lasting effect. Its popularity extends to the automotive industry, where it can be a component of sealants or adhesives. Furthermore, polymethylsilsesquioxane is included in some building materials, such as silicone compounds, where it increases their temperature and chemical resistance.

You won't find this substance in our products. Try the natural, chemical-free products in our range.

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