What it is
This ingredient is a crosspolymer built from dimethicone (a silicone) combined with polyethylene glycol (PEG) units, giving it both oil-loving and water-loving character. That dual nature lets it act as a silicone-based emulsifier that holds water-in-silicone or water-in-oil formulas together while contributing a light, silky slip. In sunscreens it is valued for helping distribute the formula evenly and for refining skin feel without a heavy or greasy residue.
Safety & warnings
Silicone crosspolymers of this type are generally well tolerated and are considered low risk for irritation and sensitization. They are not associated with fragrance allergens. Large, crosslinked silicone polymers are typically regarded as low on the comedogenicity scale.
Origin & sourcing
Synthetic. It is manufactured by crosslinking dimethicone with polyethylene glycol segments to form a network polymer.
Questions everyone asks
What does this ingredient do in a sunscreen?
It works mainly as a silicone-based emulsifier and texture agent, helping keep the formula stable and giving it a smooth, even feel on application.
Is it the same as plain dimethicone?
No. Plain dimethicone is a linear silicone fluid, while this is a crosslinked polymer that also includes PEG units, which gives it emulsifying ability that plain dimethicone does not have.