C
SECTION C — CHEMISTRY AND METALLURGY
  
CHEMISTRY
 C01
INORGANIC CHEMISTRY (obtaining metal compounds by metallurgical processes C21B, C22B; production of non-metallic elements or inorganic compounds by electrolysis or electrophoresis C25B)
 C01B
NON-METALLIC ELEMENTS, METALLOIDS AND THEIR COMPOUNDS, EXCEPT THOSE COVERED BY SUB-CLASS C01C (arsenic, antimony C22B)
 C01B

Note(s)

  1. In the absence of a reference to the contrary, a compound is classified in C01B the last appropriate place.
  2. Group C01B 21/10 takes precedence over the groups of this sub-class.

 C01C
AMMONIA AND CYANOGEN AND THEIR COMPOUNDS (C01B takes precedence in respect of salts of oxyacids of halogens C01B 11/00; peroxides, persalts C01B 15/00; compounds containing selenium or tellurium C01B 19/00; azides C01B 21/08; imido and amido compounds other than cyanamide and its salts C01B 21/10; nitrites C01B 21/50; phosphides C01B 25/08; salts of oxyacids of phosphorus C01B 25/16; arsenic C01B 27/00; antimony C01B 29/00, silicates C01B 33/20; boron C01B 35/00)

 C01D
COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM (C01C 3/14, C01F, C01G take precedence; metal hydrides C01B 6/00; salts of oxyacids of halogens C01B 11/00; peroxides, salts of peroxyacids C01B 15/00; sulphides C01B 17/22; thiosulphates, dithionites, polythionates C01B 17/64; compounds containing selenium or tellurium C01B 19/00; nitrides C01B 21/06; azides C01B 21/08; imido or amido compounds C01B 21/10; nitrites C01B 21/50; phosphides C01B 25/08; salts of oxyacids of phosphorus C01B 25/16; compounds containing arsenic C01B 27/00; compounds containing antimony C01B 29/00; carbides C01B 31/30; compounds containing silicon C01B 33/00; compounds containing boron C01B 35/00; cyanides C01C 3/08; salts of cyanamide C01C 3/16; thiocyanates C01C 3/20)

 C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, AND OF THE RARE-EARTH METALS (C01C 3/14 takes precedence; metal hydrides C01B 6/00; salts of oxyacids of halogens C01B 11/00; salts of peracids, metal peroxides C01B 15/00; sulphides or polysulphides of magnesium, calcium, strontium, or barium C01B 17/42; thiosulphates, dithionites, polythionates C01B 17/64; compounds containing selenium or tellurium C01B 19/00; nitrides C01B 21/06; azides C01B 21/08; imido or amido compounds C01B 21/10; nitrites C01B 21/50; phosphides C01B 25/08; salts of oxyacids of phosphorus C01B 25/16; compounds containing arsenic C01B 27/00; compounds containing antimony C01B 29/00; carbides C01B 31/30; compounds containing silicon C01B 33/00; compounds containing boron C01B 35/00; cyanides C01C 3/08; salts of cyanamide C01C 3/16; thiocyanates C01C 3/20)
 C01F

Note(s)

Compounds containing at least two different metals are classified in the last appropriate place in C01F or C01G


 C01G
COMPOUNDS OF METALS NOT COVERED BY SUB-CLASSES C01B TO C01F (C01C 3/14 takes precedence; metal hydrides C01B 6/00; salts of oxyacids of halogens C01B 11/00; salts of peracids, peroxides C01B 15/00; thiosulphates, dithionites, polythionates C01B 17/64; compounds containing selenium or tellurium C01B 19/00; nitrides C01B 21/06; azides C01B 21/08; imido or amido compounds C01B 21/10; nitrites C01B 21/50; phosphides C01B 25/08; salts of oxyacids of phosphorus C01B 25/16; compounds containing arsenic C01B 27/00; compounds containing antimony C01B 29/00; carbides C01B 31/30; compounds containing silicon C01B 33/00; compounds containing boron C01B 35/00; cyanides C01C 3/08; salts of cyanamide C01C 3/16; thiocyanates C01C 3/20)
 C01G

Note(s)

Compounds containing at least two different metals are classified in the last appropriate place in C01F or C01G.