Wikipedia
DPHP
Di(2-propylheptyl) phthalate, Bis(2-propylheptyl) benzene-1,2-dicarboxylate or di(propylheptyl) orthophthalate, commonly abbreviated DPHP, is an organic compound with the formula CHO. It is a phthalate and is the diester of phthalic acid and the 10-carbon branched-chain alcohol 2-propylheptanol. This colorless viscous liquid is used for softening PVC plastics and is a general purpose PVC plasticizer. It possesses very good plasticizing properties and may be used as a direct replacement for DEHP and DINP in many applications.