Section 06 Products of the chemical or allied industries 29 Organic chemicals 29 23 Quaternary ammonium salts and hydroxides; lecithins and other phosphoaminolipids, whether or not chemically defined. 29 23 40 Didecyldimethylammoium perfluorooctane sulphonate 29 23 40 00 Didecyldimethylammoium perfluorooctane sulphonate Commodity Code Description 29 23 40 00 000 Didecyldimethylammoium perfluorooctane sulphonate