Urethhall 4050D-110 Polyester polyol C. P. Hall Polyurethane (PU) - Polyols >> Polyester Coatings The URETHHALL 4050D series are liquid, saturated, linear aliphatic polyester polyols with all primary hydroxyls. These resins offer the high flexibility offered by their ether linkages. This series finds utility in a broad range of applications including adhesives, flexible coatings, castable elastomers, and slab foams. Linear, saturated aliphatic polyester polyol. Used for formulation of flexible coatings. Offers high flexibility.