Generally, 25kg three-layer plastic woven bag is used for caustic soda, the inner and outer layers are plastic woven bags, and the middle layer is a plastic inner film bag. Flake caustic soda is classified as Class 8.2 alkaline corrosive products by "Classification and Marking of Commonly Used Hazardous Chemicals (GB13690-92)", which is a Class 8 Dangerous Goods, Dangerous Regulation Code: 1823. It should be stored in a ventilated and dry warehouse or shed. The packaging container should be complete and sealed. Do not store and transport together with flammables and acids. During transportation, pay attention to moisture and rain. In case of fire, water, sand and various fire extinguishers can be used to put out the fire, but firefighters should pay attention to the corrosiveness of caustic soda dissolved in water.

 

Physical and chemical properties The pure product is colorless transparent crystal with a relative density of 2.130. Melting point 318.4 ℃. Boiling point 1390 ℃. There are two types of caustic soda available in the market: solid and liquid: pure solid caustic soda is white, in block, flake, rod, granular, and brittle; pure liquid caustic soda is colorless and transparent liquid. Solid caustic soda has strong hygroscopicity. Easily soluble in water, exothermic when dissolving, the aqueous solution is alkaline and has a greasy feeling; soluble in ethanol and glycerol; insoluble in acetone and ether. It is extremely corrosive and has a corrosive effect on fibers, skin, glass, ceramics, etc. It reacts with metal aluminum and zinc, non-metallic boron and silicon to release hydrogen; it undergoes disproportionation reaction with halogens such as chlorine, bromine and iodine; it neutralizes with acids to generate salt and water.

 

When storing solid sodium hydroxide, pay attention to sealing it tightly to prevent it from being exposed to the air to absorb moisture and deliquescence or with carbon dioxide. When using a glass bottle to hold caustic soda or other forms of sodium hydroxide, a glass stopper should not be used, but a rubber stopper should be used instead, because sodium hydroxide will react with the silicon dioxide in the glass to form sodium silicate, which will cause the stopper and the bottle Body bonding is not easy to open.