Caustic Soda Flake (Sodium Hydroxide, Lye): Characteristics and Applications
Caustic soda flake (sodium hydroxide, lye) is a strong alkaline compound widely used in various industries. It appears as white, hygroscopic flakes that dissolve well in water, releasing a significant amount of heat.
Technical Characteristics (ISIRI 364):
- Main substance (NaOH): 99.16% by mass
- Carbonate (Na₂CO₃): 0.43% by mass
- Chloride (NaCl): 0.06% by mass
- Sulfate (Na₂SO₄): 0.0047% by mass
- Silicate (SiO₂): 0.0019% by mass
- Iron (Fe): 12.5 mg/kg
- Insoluble substances in water: 0% by mass
- Aluminum (Al₂O₃): <20 mg/kg
- Heavy metals (Pb): <20 mg/kg
Applications:
- Chemical Industry: Used as a raw material for producing chemicals such as chlorine, soda, sodium hypochlorite, synthetic rubber, and plastics.
- Oil Refining Industry: For neutralizing acidic products and purifying oil and petroleum products.
- Pulp and Paper Industry: Used in the production of paper, cardboard, and viscose fiber.
- Textile Industry: For mercerizing (treating) cotton fabrics, bleaching, and dyeing.
- Food Industry: Used as food additive E524 (acidity regulator) in confectionery, chocolate, beverages, and other products.
- Construction Industry: As an additive in concrete mixtures to enhance strength and frost resistance.
- Agriculture: As a disinfectant for processing facilities and equipment in livestock and crop production.
- Household Chemicals: Found in cleaning products for ovens, stoves, cookware, tiles, sanitary ware, and other surfaces.
Important Information:
- Caustic soda is a corrosive substance that can cause burns if it comes into contact with the skin or mucous membranes.
- When handling caustic soda, use personal protective equipment: gloves, goggles, and a respirator.
- Store caustic soda in a sealed container in a dry place, away from children and pets.
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