Sodium hydroxide, also known as caustic soda, is a kind of inorganic compound. It’s a very corrosive strong base, generally in the proper execution of flakes or blocks, easily soluble in water and forms an alkaline solution. Additionally, it’s deliquescent, and it is simple to absorb water vapor and co2 in the air. You could add hydrochloric acid to test if it has deteriorated.

How Is Caustic Soda Classified

Caustic soda may be split into liquid caustic soda and solid caustic soda. Liquid caustic soda is called liquid caustic soda, that’s, sodium hydroxide solution, which really is a colorless and transparent liquid. In line with the mass fraction of sodium hydroxide, it could be split into 30%, 32%, 42%, 45%, 50% liquid caustic soda, etc., With respect to the usage of the production process, the typical concentration of market production is 30-32% or 40-42%.

Main appearances of solid alkali are flake type caustic soda or pearl type. Solid alkali is colorless and transparent crystal, and may be split into 73%, 95%, 96%, 99%, 99.5% solid alkali in line with the mass fraction of sodium hydroxide. Solid alkali includes a higher alkali content than liquid alkali. The caustic soda market in my own country is dominated by caustic soda, for the reason that caustic soda has got the benefits of simple production process, low production cost, multiple application scenarios and large market demand.


As a simple chemical raw material for the national economy, caustic soda includes a wide selection of uses. It is principally employed for the production of pulp, alumina, soap, dyes, water treatment, rayon, metal smelting, petroleum refining, cotton fabric finishing, and the purification of coal tar products. Food processing, wood processing and machinery industry, chemical industry (preparation of borax, chromium salt, manganate, phosphate, production of polycarbonate, superabsorbent polymer, zeolite, epoxy resin, sodium phosphate, sodium sulfite and large levels of sodium Salt, pharmaceuticals and organic intermediates, regeneration of old rubber), etc.

Uses of Solid Caustic Soda

Mainly found in textile printing and dyeing clothing, dye chemical industry, coating ink, surface treatment, water quality analysis, environmental protection, food cleaning, toy safety, electronic appliances, printing paper packaging, scientific research institutions and other fields.

Chemical industry, desulfurization, production of detergents, soap, papermaking, oil cleaning agents, man-made fibers and textiles, petroleum refining, food industry, water treatment, metallurgy, disinfection, soil improvement, soap making, metallurgical industry, aluminum hydroxide production, manufacturing ceramics.

Uses of Liquid Caustic Soda

Because of different production processes in existing chlor-alkali plants, the concentration of liquid caustic soda is generally 30-32% or 40-42%. Liquid caustic soda is a significant basic chemical raw material with a wide selection of uses.

In the chemical industry, it’s used to manufacture formic acid, oxalic acid, borax, phenol, sodium cyanide, soap, synthetic fatty acid, synthetic detergent, etc.

In the textile printing and dyeing industry, it’s used as a solvent for cotton desizing agent, scouring agent, mercerizing agent, vat dye and Haichang blue dye.

Utilized in the smelting industry to manufacture aluminum hydroxide, alumina and metal surface treatment agents.

In the instrument industry, it’s used being an acid neutralizer, decolorizer, and deodorizer. Adhesive industry can be used as starch gelatinizer and neutralizer.

Additionally, it’s widely found in enamel, medicine, cosmetics, leather, paint, pesticides, glass and other industries.