| 1/00 | Methods of preparing compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium, or the rare earths, in general |
| 3/00 | Compounds of beryllium |
| 3/02 | Compounds of beryllium Oxides; Hydroxides |
| 5/00 | Compounds of magnesium |
| 5/02 | Compounds of magnesium Magnesia |
| 5/04 | Compounds of magnesium Magnesia by oxidation of metallic magnesium |
| 5/06 | Compounds of magnesium Magnesia by thermal decomposition of magnesium compounds (calcining magnesite or dolomite C04B 2/1) |
| 5/08 | Compounds of magnesium Magnesia by thermal decomposition of magnesium compounds (calcining magnesite or dolomite C04B 2/1) by calcining magnesium hydroxide |
| 5/10 | Compounds of magnesium Magnesia by thermal decomposition of magnesium compounds (calcining magnesite or dolomite C04B 2/1) by thermal decomposition of magnesium chloride with water vapour |
| 5/12 | Compounds of magnesium Magnesia by thermal decomposition of magnesium compounds (calcining magnesite or dolomite C04B 2/1) by thermal decomposition of magnesium sulfate, with or without reduction |
| 5/14 | Compounds of magnesium Magnesium hydroxide |
| 5/16 | Compounds of magnesium Magnesium hydroxide by treating magnesia, e.g. calcined dolomite, with water or solutions of salts not containing magnesium |
| 5/20 | Compounds of magnesium Magnesium hydroxide by precipitation from solutions of magnesium salts with ammonia |
| 5/22 | Compounds of magnesium Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline earth oxides or hydroxides |
| 5/24 | Compounds of magnesium Magnesium carbonates |
| 5/26 | Compounds of magnesium Magnesium halides |
| 5/28 | Compounds of magnesium Magnesium halides Fluorides |
| 5/30 | Compounds of magnesium Magnesium halides Chlorides |
| 5/32 | Compounds of magnesium Magnesium halides Chlorides Preparation of anhydrous magnesium chloride by chlorinating magnesium compounds |
| 5/34 | Compounds of magnesium Magnesium halides Chlorides Dehydrating magnesium chloride containing water of crystallisation |