Section 06 Products of the chemical or allied 29 Organic chemicals 29 03 Halogenated derivatives of hydrocarbons 29 03 77 - - - Tetrachlorodifluoroethanes 29 03 77 30 - - - Tetrachlorodifluoroethanes Commodity Code Description 29 03 77 30 000 - - - Tetrachlorodifluoroethanes