film-forming agent. Large group of ingredients that are typically found in hair-care products, but that are also widely used in skin-care products, particularly moisturizers. Film-forming agents include PVP, acrylates, acrylamides, and copolymers. When applied they leave a pliable, cohesive, and continuous covering over the hair or skin. This film has water-binding properties and leaves a smooth feel on skin. Film-forming agents can be weak skin sensitizers (Source: Contact Dermatitis, October 2007, pages 242–247).