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C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane

What C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane is & what it does

C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane is a silicone-based film former, a silsesquioxane resin modified with long-chain alkyl groups. In sunscreens and color cosmetics it helps build a water-resistant, long-wearing film that improves the durability of the product on skin. A notable property is that it can boost the water resistance and rub-off resistance of sunscreen formulas.

What does C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane do in sunscreen?

It is a silicone resin film former that helps build a durable, water-resistant film on skin. In sunscreens it can improve water resistance and help the product stay put through sweat and swimming. It is a formulation helper that supports wear rather than an active sunscreen filter.

Is C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane safe?

This silicone-based film former is widely used in sunscreens and color cosmetics and is generally considered safe at the levels used. As a large polymer it remains on the skin surface and is not expected to penetrate. If you have specific concerns, consult a dermatologist.

Is C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane natural or synthetic?

It is synthetic, being a silicone (silsesquioxane) resin modified with long alkyl chains and made through chemical processing. It does not occur in nature. It contains no animal-derived material, so it is generally suitable for vegan formulas.

Sunscreens with C30-45 Alkyldimethylsilyl Polypropylsilsesquioxane

We rate 10 sunscreens that contain it:

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