1
Industrial chemicals; Raw chemicals; Oil-bleaching chemicals; Oil purifying chemicals; Chemical additives; Chemical preparations for use as corrosion inhibitors; Chemical inhibitors against acid attack; Chemicals for use in the treatment of oils; Chemical additives for petrol; Chemical additives for oils; Oil dispersants; Petroleum dispersants; Demulsifiers; Chemical substances, chemical materials and chemical preparations and natural elements; Salts for industrial purposes; Cleaning solvents for use in manufacturing processes; Defoaming agents; Detergents for industrial use; Detergents for use in manufacturing processes; Chemical additives for oil well drilling fluids; Chemical additives for oil well drilling fluid; Chemical additives for borehole stabilisation in oil well drilling; Chemicals for use in the formation of gas wells; Anti-foaming agents; Catalysts for use in the oil processing industry; Chemical additives for drilling fluids; Chemical additives for fuel injection system cleaners; Chemical additives for oil well cements; Chemical additives for use as defoaming agents; Chemical additives for use in industry; Chemical additives for use in manufacture; Chemical additives for use in the production of fuels; Chemical gas purifying agents; Chemical intermediates for use in manufacture; Chemical intermediates for use in industry; Chemical preparations for use in industry; Chemical preparations for use in the treating of wells; Chemical reagents for use in industry; Chemical substances for removing contaminants from gas-treating solvents; Chemical substances for use in manufacture; Chemicals for absorbing oxygen; Chemicals for preventing corrosion; Chemicals for the treatment to improve corrosion resistance; Chemicals for use as processing additives in the petrochemicals industry; Chemicals for use in the gas industry; Chemicals for use in the oil refining industry; Chemicals for use in the petrochemicals industry; Chemicals for use in the drilling of wells; Chemicals for use in the oil drilling industry; Chemicals for use in the refining of oils; Chemicals for use in the formation of oil wells; Chemicals for use in the oil industry; Chemicals used in oil drilling; Fluids for use in the oil industry; Fluids for use in the transport of particulate materials in gas wells; Fluids for use in the transport of particulate materials in oil wells; Fluorescent chemicals; Additives (Chemical -) for use in the drilling of subterranean oil wells; Additives (Chemical -) for use in the drilling of subterranean gas wells; Additives (Chemical -) for use in the completion of subterranean gas wells; Additives (Chemical -) for use in drilling; Additives (Chemical -) for petroleum products
37
Anti-corrosion treatment; Clearing of pipework systems used in the refining industries; Installation of industrial plant; Installation of instrumentation systems; Installation of insulating materials; Installation of plumbing systems
40
Treatment of natural gas