Section 06 Products of the chemical or allied 29 Organic chemicals 29 03 Halogenated derivatives of hydrocarbons 29 03 51 Tetrafluoropropene (HFO-1234yf),(HFO-1234ze) and (Z)-hexafluoro-2-butene (HFO-1336mzz) 29 03 51 00 Tetrafluoropropene (HFO-1234yf),(HFO-1234ze) and (Z)-hexafluoro-2-butene (HFO-1336mzz) Commodity Code Description 29 03 51 00 00 Tetrafluoropropene (HFO-1234yf),(HFO-1234ze) and (Z)-hexafluoro-2-butene (HFO-1336mzz)