Cosmetic ingredient

POLYMETHYLSILSESQUIOXANE

POLYMETHYLSILSESQUIOXANE is a silicon-based polymer. It is not a botanical extract: its technical description defines it as the product of hydrolysis and condensation of methyltrimethoxysilane, steps that join smaller units into a polymeric structure.

INCIPO2 products
CAS number
68554-70-1
EC number
-

POLYMETHYLSILSESQUIOXANE: what it is

POLYMETHYLSILSESQUIOXANE is a silicon-based polymer. It is not a botanical extract: its technical description defines it as the product of hydrolysis and condensation of methyltrimethoxysilane, steps that join smaller units into a polymeric structure.

The material belongs to the methylsilsesquioxane family. Materials research describes PMSQ made by hydrolytic polycondensation of methyl silanes and shows that reaction conditions affect the final structure; the name alone therefore does not reveal the physical form or the exact origin of the material in a particular product.

POLYMETHYLSILSESQUIOXANE: what it does in cosmetics

In cosmetics, POLYMETHYLSILSESQUIOXANE is used as an opacifying ingredient. In everyday terms, it makes a formula less transparent and can contribute to a more opaque or whitish appearance instead of a see-through one.

The PMSSO research located evaluates material properties such as hydrophobicity, surface area, and potential filler use in several applications. It is not a clinical study of a cosmetic applied to skin, so it does not support claims to treat acne, wrinkles, dark spots, or other skin conditions.

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