HEXAFLUOROPROPENE DIMERS OF HEXAFLUOROPROPENE 1,1,2,3,3,3-hexafluoroprop-1-ene Dimer Hexafluoropropylene oxide HEXAFLUOROPROPYLENE DIMER 1,1,2,3,3,3-Hexafluoro-1-propene, dimer 1-Propene, 1,1,2,3,3,3-hexafluoro-, dimer