When applied polyurethane Baycusan ® in rinse off hair products, Baycusan can provide an effective charge balance barrier to protect the hair, and effectively wrap pollutants when washing with the shampoo. In the leave-on products, Baycusan ® can form a strong, flexible and water-resistant film on the hair surface to support the hair styling effect. At the same time, Baycusan can make it difficult for pollutants to adsorb on its surface, effectively reduce the pollution of PM2.5 particles on hair, and also wrap the pollutants well when washing by water, so as to have a better anti-pollution effect.Baycusan ® has better anti-pollution (PM2.5) effect compared with traditional polymers, such as cationic polymers in rinse-off products and commonly-used film formers in leave-on products.