What it is
PEG/PPG-19/19 Dimethicone is a dimethicone backbone modified with both polyethylene glycol and polypropylene glycol chains, giving it surfactant and emulsifying behavior. It helps blend water and silicone phases into stable, elegant emulsions and contributes a light, smooth skin feel. It is common in sunscreens, primers, and base makeup where a fresh, non-greasy texture is desired.
Safety & warnings
Silicone polyether surfactants of this type are generally well tolerated and considered non-irritating at typical use levels. It is not a fragrance allergen and is not notably associated with comedogenicity, though sensitive users may wish to patch test.
Origin & sourcing
Synthetic; a silicone polymer modified with PEG and PPG (polyethylene and polypropylene glycol) side chains to make it surface-active.
Questions everyone asks
What does PEG/PPG-19/19 dimethicone do?
It is a silicone-based emulsifier that helps combine water and silicone phases into a stable, lightweight emulsion.
Does it make formulas feel greasy?
No. It typically contributes a light, smooth, non-greasy skin feel, which is why it is common in sunscreens and primers.