Polyurethane-35 is a synthetic polymer commonly used in cosmetic formulations. It serves as a film-forming agent, which means it creates a thin, flexible, and continuous layer on the skin or hair. This layer helps to provide a smooth texture, improve product adherence, and enhance water resistance.In cosmetic formulations, Polyurethane-35 can be found in various products such as makeup, skincare, and hair care products. Its use cases include:1. Makeup: In foundations, mascaras, and eyeliners, Polyurethane-35 helps to improve the product's wear time, smudge resistance, and overall performance.2. Skincare: In sunscreens and moisturizers, it can enhance water resistance and provide a smooth, even application.3. Hair care: In styling products like hair gels, sprays, and serums, Polyurethane-35 helps to hold the hair in place, provide a flexible hold, and protect the hair from humidity.Overall, Polyurethane-35 is a versatile ingredient that contributes to the performance, texture, and longevity of various cosmetic products.