Polymethylsilsesquioxane ●
TL;DR. This ingredient is primarily a texture and optical modifier, adding slip, a dry powder feel, and soft-focus blurring in creams, primers, makeup, and powders. It can also support film formation and help improve wear.
What does Polymethylsilsesquioxane do in a cosmetic formula?
This ingredient is primarily a texture and optical modifier, adding slip, a dry powder feel, and soft-focus blurring in creams, primers, makeup, and powders. It can also support film formation and help improve wear.
Is Polymethylsilsesquioxane clean?
It is generally low-irritation and not a common sensitizer, but many clean-beauty frameworks restrict synthetic organosilicon polymers as a category. The concern is less about direct skin tolerance and more about clean-standard compatibility and end-of-life profile.
Is Polymethylsilsesquioxane sustainable?
This material is synthetically produced from silicon-based chemistry rather than renewable plant feedstocks. It is not readily biodegradable and is expected to be environmentally persistent as an inert particulate polymer.
Is Polymethylsilsesquioxane COSMOS-approved?
This ingredient is not permitted under COSMOS-natural or COSMOS-organic standards. From a Green Chemistry lens, it has weak alignment because it is synthetic, persistent, and not based on renewable feedstocks, even though it is chemically stable and used at relatively low levels.
How does Polymethylsilsesquioxane work chemically?
The molecule is a highly crosslinked three-dimensional organosilicon resin made of methyl-substituted silicon-oxygen units, which gives it a rigid, powdery, light-scattering structure. Typical use levels are often around 1 to 10% in complexion and skin-finish formulas, and it is water-insoluble, broadly pH-stable in cosmetic systems, and not prone to oxidation like unsaturated lipids.
Last updated 2026-05-13