Amp-Acrylates/Allyl Methacrylate Copolymer

Amp-Acrylates/Allyl Methacrylate Copolymer is a synthetic polymer—a chain of linked molecules created through chemical synthesis. It belongs to a family of film-forming agents used across cosmetics and personal care products.

In skincare, this ingredient functions primarily as a film former, creating a thin, flexible layer on the skin's surface. It is relatively uncommon in skincare products (appearing in roughly 0.1% of formulations) and is more frequently encountered in hair care and styling products.

This copolymer works by forming a continuous film across the skin's surface. When applied in a formulation, the polymer molecules link together and dry to create a flexible, breathable coating that sits on top of the stratum corneum (the outermost layer of skin).

By occluding the skin surface, it can help reduce water loss—a mechanism similar to how other film-forming ingredients work. The flexibility of this particular polymer means the film can stretch and move with the skin without cracking.

This ingredient is typically incorporated into finished formulations by manufacturers, so you won't need to dose it yourself. Simply use your skincare product as directed on the label. If using a product containing this polymer, apply to clean skin and allow it to dry fully before applying other products, as the film may affect the absorption of subsequent layers.