Bayhydrol PR 340 Aliphatic polyurethane resin Bayer MaterialScience Polyurethane (PU) - Polyurethane dispersions (PUDs) Coatings >> Waterborne Wood & Furniture Coatings Plastic coating Metal Water Aliphatic anionic polyurethane dispersion As a binder in the formulation of highly flexible water-thinnable coatings for wood, metal, plastics and mineral substrates. Also as a combination binder to improve the elasticity and flexibility of waterthinnable coatings. Bayhydrol PR 340 can be used as the sole binder in the formulation of flexible lightfast coatings. The product is also suitable for combination with other water-thinnable binders. The pH of ready-to-use coatings should be between 7 and 8. Substances such as ammonia can be used to adjust the pH. Yellowing has sometimes been observed on maple. A test area should be coated before application on large surfaces. Aliphatic anionic polyurethane dispersion. Used as a binder in the formulation of highly flexible, lightfast water-thinnable coatings for wood, metal, plastics and mineral substrates, and as a combination binder to improve the elasticity and flexibility of water-thinnable coatings.