What it is
Lauryl PEG/PPG-18/18 Methicone is a polyether- and alkyl-modified silicone in which polyethylene glycol, polypropylene glycol, and a lauryl chain are attached to a dimethicone backbone. This structure gives it both water-loving and oil/silicone-loving regions, making it an effective emulsifier for water-in-silicone systems common in modern sunscreens and color cosmetics. It helps produce stable, lightweight emulsions with a smooth, non-greasy feel.
Safety & warnings
Silicone polyether emulsifiers of this type are generally well tolerated and considered low risk for irritation or sensitization at the levels used in finished products.
Origin & sourcing
Synthetic, manufactured by grafting PEG, PPG, and lauryl groups onto a polydimethylsiloxane backbone.
Questions everyone asks
Why is this ingredient common in sunscreens?
It is a silicone emulsifier well suited to water-in-silicone formulas, which are popular in sunscreens for their light, smooth feel and even spreadability.
Does it contribute to SPF?
No. It is an emulsifier that stabilizes the formula; the sun protection comes from the separate UV filters in the product.