Section 06 Products of the chemical or allied 29 Organic chemicals 29 03 Halogenated derivatives of hydrocarbons 29 03 77 - - - Tetrachlorotetrafluoropropanes 29 03 77 70 - - - Tetrachlorotetrafluoropropanes Commodity Code Description 29 03 77 70 000 - - - Tetrachlorotetrafluoropropanes