What it is
Lauryl PEG-10 Tris(Trimethylsiloxy)silylethyl Dimethicone is a silicone polyether (a dimethicone backbone carrying both a lauryl chain and a PEG group) that acts as an emulsifier for water-in-oil and water-in-silicone systems. It allows water and silicone or oil phases to be combined into stable, elegant emulsions with a light, smooth feel. It is widely used in sunscreens, foundations, and cushions where a fresh, non-greasy texture and good wear are desired.
Safety & warnings
Silicone-based emulsifiers of this class are generally well tolerated and considered non-irritating at typical use levels. It is not a fragrance allergen. It is not notably associated with comedogenicity, though very sensitive or acne-prone users may wish to patch test.
Origin & sourcing
Synthetic; a silicone polymer modified with both alkyl (lauryl) and polyethylene glycol chains to give it emulsifying properties.
Questions everyone asks
What is this ingredient's job in a sunscreen?
It is an emulsifier that keeps the water and silicone or oil phases blended into a stable, lightweight emulsion with a smooth feel.
What kind of emulsions does it make?
It is suited to water-in-oil and water-in-silicone systems, which often deliver a fresh, non-greasy finish and durable wear.