Sodium hydroxide 
 Chemical Formula: NaOH 
 CAS :1310-73-2 
 White solid, there is a strong corrosive, water absorption, density: 2.130 g / cm 3 Melting Point: 318.4 ℃ Boiling point: 1390 ℃ 
 Uses: wide range of uses in the chemical experiments, in addition to other reagents used, because it has a strong moisture absorption, can also be used as alkaline drying agent. Caustic soda in the national economy are widely used in many industrial sectors need to caustic soda. Use of caustic chemicals sector is the largest manufacturing, followed by paper, aluminum, tungsten refining, rayon, rayon and soap manufacturing. In addition, in the production of dyes, plastics, pharmaceutical and organic intermediates, the regeneration of old rubber, manufacturing metal sodium, and inorganic salt electrolysis of water production, the system of borax, chromium, manganese salts, phosphate, etc., have to use a lot of caustic soda