FR-TEP is one of halogen-free flame retardant, that can be used for polyurethane foam material. FR-TEP is a high boiling solvent, which can be applied as a solvent for cellulose nitrate and cellulose acetate, plasticizer for rubber and plastics with dual effects of flame retardant and plasticizing. There is function of catalyst in FR-TEP, and it can be used for acetic acid lysis, xylene isomerism, olefin polymerization, manufacture of tetraethyl lead and carbonized diimide.