Bayhydrol XP 2637 is a an ionic/non-ionic polycarbonate ester polyurethane dispersion. Bayhydrol XP 2637 is a solvent-free polyurethane dispersion which can be used to formulate coatings that harden at room temperature or baking coatings. It allows coating of a wide variety of substrates ranging from hard ones to flexible ones such as leather- textiles- plastics and metals. Coatings formulated with Bayhydrol XP 2637 exhibit high scratch resistance and lightfastness. Other benefits of Bayhydrol XP 2637 are good aging stability and very good hydrolysis resistance.