Section 06 Products of the chemical or allied industries 29 Organic chemicals 29 03 Halogenated derivatives of hydrocarbons. 29 03 74 Chlorodifluoroethanes (HCFC-142, 142b) 29 03 74 00 Chlorodifluoroethanes (HCFC-142, 142b) Commodity Code Description 29 03 74 00 000 Chlorodifluoroethanes (HCFC-142, 142b)