01	Industrial Chemistry and Chemical Processing	Techniques, processes, unit operations, apparatus and plant equipment that apply to chemical manufacturing, processing, transportation and storage; Specifications and standards for shipping of chemicals; Desalination technology. For disposal of industrial wastes, See Field 24, Environmental Pollution and Control.
02	Inorganic Chemistry	Synthesis, properties and reactions of inorganic compounds; Studies of the chemical elements; Inorganic quantitative and qualitative analysis; Complex compounds including metal carbonyls. Includes spectra studies of inorganic compounds. For fuels chemistry, See 21/04, Fuels. For the chemistry of rocket propellants, See 21/09, Rocket Propellants. See also Field 11, Materials. For inorganic polymers, See 07/06, Polymer Chemistry.
03	Organic Chemistry	Synthesis, properties and reactions of organic compounds; Organic quantitative and qualitative analysis. Includes spectra studies of organic compounds. For fuels chemistry, See 21/04, Fuels. For the chemistry of rocket propellants, See 21/09, Rocket Propellants. See also 06/01, Biochemistry; 06/15, Pharmacology; and Field 11, Materials. For organic polymers, See 07/06, Polymer Chemistry.
04	Physical Chemistry	Physical aspects and theoretical interpretations of chemical systems; Colloid chemistry; Catalysis; Chemical solutions; Reaction kinetics; Chemical equilibria; Chemical thermodynamics; Thermochemistry; Electrochemistry; Phase studies of non-metallic systems; Liquid crystals; Quantum chemistry; Physical methods of analysis not applied exclusively to either organic or inorganic chemical substances; Membranes; Surface chemistry. For the qualitative and quantitative analysis of chemical substances by means of their spectra, See 07/02, Inorganic Chemistry, and 07/03, Organic Chemistry. For photochemistry, See 07/05, Radiation and Nuclear Chemistry. For spectroscopic studies, See 20/05, Atomic and Molecular Physics and Spectroscopy.
05	Radiation and Nuclear Chemistry	Studies involving the interrelationships of electromagnetic or particle radiation and chemical reactions; Study of radioactive substances and their chemical reactions; Radiochemistry; Photochemistry. See also 18/02, Isotopes, and 18/07, Radioactivity, Radioactive Wastes and Fission Products.
06	Polymer Chemistry	Synthesis, properties and reactions of polymers; Polymerization; Curing; Crosslinking. For the applications of polymers, see group where the application is treated, for example, 11/01, Adhesives, Seals and Binders; 11/05, Textiles, etc.