The article contains sections titled: 1. Introduction 2. Physical and Chemical Properties of Compounds of the System Na 2 S ‐ S 2.1. Physical Properties 2.2. Chemical Properties 3. Production of Compounds of the System Na 2 S ‐ S 3.1. Sodium Tetrasulfide 3.2. Sodium Disulfide 3.3. Sodium Monosulfide 4. Sodium Hydrogensulfide 4.1. Properties 4.2. Production 5. Sulfanes 5.1. Properties 5.2. Production 6. Uses of Sulfides and Sulfanes 7. Safety and Environmental Aspects 8. Economic Aspects 9. Transportation

The article contains sections titled: 1. Introduction 2. Properties 3. Occurrence 4. Production 4.1. Chemical Processes 4.2. Electrolytic Processes 4.2.1. Development of Molten Salt Electrolysis of NaOH and NaCl 4.2.2. Description and Operation of NaCl Molten Salt Electrolytic Cell 4.2.3. Properties of the Electrolyte 4.2.4. Other Electrolytic Processes 5. Safety 6. Uses 7. Sodium Alloys 8. Packaging and Transport 8.1. Forming Sodium Metal 8.2. Transport Regulations 8.3. Break‐Bulk Packaging 8.4. Portable Tanks 9. Quality Specifications and Analysis 10. Health and Safety 11. Economic Aspects

A method of using a water elutriator in combination with screen tests to determine the Results of tests of milled enamels fineness distribution of milled enamels is described. which were ground under various conditions are given.

The article contains sections titled: 1. Introduction 2. Structure and Properties 3. Preparation 4. Uses