A bio based plasticizer with improved properties and processing characteristics of polymer comprising at least 95% by weight compound of formula 1, [Formula should be inserted here] wherein R1 R2 and R3 represent each an acyl group or a hydrogen atom, said acyl group comprises at least one with 2 carbon atoms and one with 12 carbon atoms, the acyl group having 2 carbon atoms is present in an amount, on an average, of up to 2 mole per mole of glycerine.