Best For Skin Types
All, Oily, Combination
Addresses
Usage Frequency
Daily
What Is Polydiethylsiloxane?
Polydiethylsiloxane is a silicone-based emollient derived from silicone polymers. It is a colourless, odourless liquid that sits on the skin's surface rather than penetrating deeply.
In skincare formulations, it functions primarily as an emollient and texture enhancer, helping to create a smooth, uniform appearance and improving the spreadability of products.
How It Works
Polydiethylsiloxane works by forming a thin, breathable film across the skin's surface. This layer smooths micro-irregularities in skin texture, which can optically refine the appearance of pores and fine lines.
Unlike heavier occlusive ingredients, silicones of this type are designed to feel lightweight and non-greasy, making them popular in formulations intended for oily or combination skin types.
Clinical Evidence & References
Silicones as a category have a long history of use in cosmetics and are generally recognised as safe and well-tolerated. Polydiethylsiloxane specifically is valued in formulation for its sensory and texture-enhancing properties, though direct clinical studies measuring skin benefit are limited.
Evidence supports the role of silicone-based ingredients in improving product spreadability and creating a smooth skin appearance, though individual results may vary depending on concentration and formulation context.
How to Use
Polydiethylsiloxane is typically a background ingredient rather than an active, so look for it in serums, primers, foundations, and moisturisers. It works well in layered routines and does not require special application timing. Its lightweight nature makes it suitable for use alongside other actives without significant interaction concerns.
Safety & Precautions
Frequently Asked Questions
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Take the skin quizRelated Ingredients
Perfluorononyl Dimethicone …
A silicone polymer that binds formula ingredients and creates a smooth, even application
Phenethyl Disiloxane
A silicone-derived ingredient that smooths texture and reduces foam in formulations
Phenylisopropyl Dimethicone
A silicone conditioning agent that smooths and protects hair and skin
Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone
A silicone-based conditioning agent that smooths and protects skin and hair
Polypropylsilsesquioxane
A silicone polymer that creates a smooth, protective film on skin
Potassium Dimethicone PEG-7 Panthenyl Phosphate
A silicone-based conditioning agent that smooths and protects skin and hair
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