D 7009 (OTTO) Di(propylene glycol) dibenzoate, 97% Cas 27138-31-4 - used as a diluent for the preparation of polysulfone membranes by heat induced phase separation. It finds potential applications in water treatment and food processing. It may also be used as a plasticizer with poly(vinyl) chloride (PVC) for the fabrication of diamond coated PVC.