Oxyester T 1136 Polyester diol Degussa PU - Polyols >> Polyester ADHESIVE Polyester diol (linear). Used as flexibilizer for 1 or 2 pack PUR systems, light stable 2 pack PUR elastomers and backbone for PUR modified resins. Polyester diol. Used as flexibilizer for 1 or 2 pack polyurethane systems, light stable 2 pack PUR elastomers and backbone for PUR modified resins.