What it is
This is a water-dispersible silicone created by attaching PEG (polyethylene glycol) chains to a dimethicone backbone, which makes the otherwise water-repellent silicone able to interact with water. It is commonly used to help blend oil and water phases and to give formulas a smooth, silky feel. In sunscreens it supports emulsion stability and pleasant texture rather than providing UV protection.
Safety & warnings
PEG-modified silicones like this are generally considered well tolerated in cosmetic use and are not typical sensitizers. As with other PEG-derivatives, they are used in finished products manufactured to limit residual impurities.
Origin & sourcing
Synthetic; a silicone polymer chemically modified with polyethylene glycol units.
Questions everyone asks
What is PEG-12 Dimethicone used for?
It acts mainly as an emulsifier that helps oil and water mix, and it lends a smooth, silky skin feel to creams and lotions.
Is it a silicone?
Yes. It is a dimethicone (silicone) modified with PEG chains so that it disperses in water and can serve as an emulsifier.