Stearyl Triethoxysilane

Stearyl triethoxysilane is an organosilane silicone with a long stearyl chain and hydrolyzable triethoxy groups. It works as a film former and surface modifier, helping products spread more evenly, wear longer, resist water, and feel more refined.
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Ingredient Snapshot

Overview
A silicone that helps makeup last longer and resist water.
Category
Tone/Texture, Skin Conditioning
Type
Silicone

Ingredient Ratings

Overall Rating

Fair

Comedogenic Risk

None

Skin Benefits

It helps makeup stay put longer and better tolerate sweat and humidity, providing a refined, silky finish that smooths the look of uneven texture.

Uses In Skincare & Cosmetics

It's used in primers, long-wear foundations, and sunscreens to form flexible films that improve durability, and appears in setting products and fluid serums aimed at a smoother finish.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

It's generally regarded as low toxicity, but may cause mild stinging or irritation, especially on sensitive or freshly exfoliated skin. Avoid applying to broken skin and discontinue use if redness or discomfort occurs.

Is Stearyl Triethoxysilane a Good Ingredient?

It rates Fair because it boosts wear and water resistance as a film former, but direct skin benefits are limited and data on long-term conditioning effects are modest. Film formation and possible hydrolysis byproducts can also pose mild irritation risks for sensitive or compromised skin.

Products with Stearyl Triethoxysilane

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