Generally, 25kg three-layer plastic woven bags are used for caustic soda, with the inner and outer layers made of plastic woven bags, and the middle layer made of plastic inner membrane bags. Alkaline flakes are classified as Class 8.2 alkaline corrosives in the Classification and Labeling of Commonly Used Hazardous Chemicals (GB13690-92), classified as Class 8 hazardous materials, with a hazard code of 1823. It should be stored in a ventilated and dry warehouse or cargo shed. The packaging container should be complete and sealed. It is not allowed to store and transport flammable materials and acids together. During transportation, attention should be paid to moisture-proof and rainproof measures. When a fire occurs, water, sand, and various fire extinguishers can be used to extinguish it, but firefighters should pay attention to the corrosiveness of the water dissolved in caustic soda.

The physical and chemical properties of the pure product are colorless transparent crystals with a relative density of 2.130. Melting point 318.4 ℃. Boiling point 1390 ℃. There are two types of commercially available caustic soda: solid and liquid. Pure solid caustic soda is white in color and can be packaged in blocks, flakes, rods, or granules, with a brittle texture; Pure liquid caustic soda is a colorless and transparent liquid. Solid caustic soda has strong hygroscopicity. Easy to dissolve in water, releases heat when dissolved, and the aqueous solution is alkaline with a slippery feeling; Soluble in ethanol and glycerol; Insoluble in acetone and ether. Extremely corrosive, with corrosive effects on fibers, skin, glass, ceramics, etc. Reacting with metallic aluminum and zinc, non-metallic boron and silicon to release hydrogen; Disproportionation reaction with halogens such as chlorine, bromine, and iodine; Neutralizing with acids to form salts and water.

When storing solid sodium hydroxide, attention should be paid to sealing it tightly to prevent exposure to air, absorption of moisture, deliquescence, or contact with carbon dioxide. When using glass bottles to hold caustic soda or other forms of sodium hydroxide, glass stoppers should not be used. Instead, rubber stoppers should be used, as sodium hydroxide will react with silica in the glass to produce sodium silicate, making it difficult to open the cork and bottle body.