Lupraphen 8109 Aliphatic polyester polyol BASF-Elastogran PU - Polyols >> Polyester Lupraphen 8109 is a partially-branched, aliphatic polyester polyol. Lupraphen 8109 is used for the production of polyurethane flexible elastomers. Partially-branched, aliphatic polyester polyol. Used for the production of polyurethane flexible elastomers.