Code 2904
SULPHONATED, NITRATED OR NITROSATED DERIVATIVES OF HYDROCARBONS, WHETHER OR NOT HALOGENATED
SECTION VI. Products of the chemical or allied industries
I. HYDROCARBONS AND THEIR HALOGENATED, SULPHONATED, NITRATED OR NITROSATED DERIVATIVES
2904
Sulphonated, nitrated or nitrosated derivatives of hydrocarbons, whether or not halogenated:
perfluorooctane sulphonic acid, its salts and perfluorooctane sulphonyl fluoride: