Acrylates/Stearyl Acrylate/Dimethicone Methacrylate Copolymer

Acrylates/stearyl acrylate/dimethicone methacrylate copolymer is a synthetic polymer—a long chain of linked molecules—designed to form a thin, continuous film on the skin's surface. It combines acrylic and silicone components to create a flexible coating that adheres to skin.

This ingredient is used primarily in skincare and colour cosmetics for its film-forming properties. It appears in roughly 0.2% of skincare formulations, most commonly in products designed to smooth texture or provide a refined finish.

Once applied, this copolymer dries to form a flexible, breathable film across the skin's surface. The stearyl acrylate component provides hydrophobic (water-repelling) properties, whilst the dimethicone portion adds slip and silky feel. Together, they create a smooth matrix that can temporarily minimise the visibility of skin texture irregularities.

The film is not occlusive—it allows skin to breathe—but it does sit on top of the skin rather than penetrating it. This makes it useful for creating a refined base for makeup or for enhancing the sensory experience of a skincare product.

Products containing this ingredient are typically applied as part of a routine step—often as part of a primer, base, or finishing product. Follow the instructions on your specific product. It works well over serums or moisturisers and before makeup application. No special handling is required; simply apply evenly to clean skin and allow to set if the product instructions suggest this.