PEG …

PEG/PPG-17/18 Dimethicone is a synthetic polymer derived from silicone and polyethylene glycol. It belongs to a class of ingredients called emulsifiers, which allow water-based and oil-based components to mix smoothly within a formulation. Without emulsifiers, these ingredients naturally separate—much like oil and vinegar in salad dressing.In skincare products, this ingredient serves a functional role rather than a direct skin-benefit role. It appears in roughly 0.1% of formulations, typically in lightweight creams, serums and moisturisers where a stable, well-blended texture is important.

PEG/PPG-17/18 Dimethicone acts as a bridge between water-loving (hydrophilic) and oil-loving (lipophilic) components. One part of its molecular structure attracts water, whilst another part attracts oils. This dual affinity allows the ingredient to hold these normally incompatible phases together in a stable emulsion.The result is a formulation that feels light and spreads evenly without separation or greasiness—a largely cosmetic function that improves how the product performs on application.

This is a formulation ingredient rather than an active, so there is no specific usage guidance beyond following the product instructions. Products containing PEG/PPG-17/18 Dimethicone can typically be used daily as part of your regular skincare routine.

Generally well-tolerated and recognised as safe in cosmetic formulations. Those with silicone sensitivity may wish to patch-test or choose silicone-free alternatives.