Urethhall 4050-110 Polyester polyol C. P. Hall Polyurethane (PU) - Polyols >> Polyester Coatings >> Solventborne URETHHALL 4050 polyols are liquid, linear, saturated, aliphatic polyester polyols with all primary functionality. The primary use for the URETHHALL 4050 series are the formulation of urethanes for solvent based coatings, adhesives, and for thermoplastic urethanes (TPU). Lower prepolymer viscosities than adipates have been shown. Linear, saturated aliphatic polyester polyol. Used for formulation of urethanes for solvent based coatings.