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    Caustic soda Flakes

    Caustic Soda Flakes, also known as solid sodium hydroxide (NaOH), is a highly caustic, strong alkaline compound appearing as white flakes. It is produced by evaporating a 50% caustic soda (liquid NaOH) solution.
    This material reacts vigorously with acids, light metals, water, oils, and fats, and is widely used across chemical, petrochemical, detergent, food, textile, and oil & gas industries.


    Chemical Structure of Caustic Soda Flakes

    • Chemical Name: Sodium Hydroxide

    • Chemical Formula: NaOH

    • Ionic Structure: Na⁺ and OH⁻ ions in an orthorhombic crystal lattice

    • CAS Number: 1310-73-2

    • EC Number: 215-185-5

    • Molecular Weight: 40.00 g/mol


    Physical and Chemical Properties

    Property Description
    Physical State White solid flakes
    Melting Point 318°C
    Boiling Point / Decomposition 1,388°C (decomposes to Na₂O and H₂O at high temperatures)
    Density 2.13 g/cm³
    pH (1% aqueous solution) 13 – 14
    Solubility in Water Highly soluble; exothermic reaction upon dissolution
    Reactivity Extremely reactive with water, acids, and light metals (e.g., aluminum, zinc) – releases flammable hydrogen gas
    Odor / Viscosity Odorless; non-viscous (solid form)

    Applications of Caustic Soda Flakes

    Detergent and Cleaning Industries

    • Manufacturing of solid and liquid soaps, dishwashing liquids, degreasers, bleaches, and disinfectants

    • Fat and oil removal in industrial wastewater treatment

    Oil, Gas, and Petrochemical Industries

    • Neutralization of acids in various processes

    • Sweetening of crude oil and natural gas (removal of H₂S and CO₂)

    • Regeneration of ion-exchange resins

    Pulp, Paper, and Textile Industries

    • Used in the Kraft process for separating cellulose fibers from wood

    • pH control during dyeing, washing, and bleaching

    Food Industry (Food Grade – E524)

    • CIP (Cleaning in Place) for pipelines and storage tanks

    • Used in chocolate, ice cream, soft drinks, and olive curing (in very small, controlled doses)

    Metal and Surface Treatment

    • Polishing and etching of aluminum surfaces

    • Metal extraction from ores

    • Scale removal and cleaning of industrial equipment


    Advantages of Caustic Soda Flakes

    • Highly effective in neutralizing acids and fats

    • Low cost and readily available in bulk quantities

    • Versatile – applicable across numerous industries

    • Long-term stability when stored in dry conditions

    • Flake form allows for easier handling, dosing, and storage


    Disadvantages of Caustic Soda Flakes

    • Highly corrosive to skin, eyes, and many metals

    • Exothermic reaction with water → risk of chemical burns

    • Hygroscopic – absorbs moisture from the air, leading to caking

    • Requires alkali-resistant equipment for handling and transfer

    • Corrosive to seals, valves, and light metal fittings


    Safety and Handling Information

    • GHS Classification: Corrosive – H314 (Causes severe skin burns and eye damage) – GHS Class 8

    • Personal Protective Equipment (PPE):

      • Gloves: Neoprene or PVC

      • Eye Protection: Safety goggles or face shield

      • Respiratory Protection: Mask or respirator for dust exposure

      • Clothing: Alkali-resistant lab coat or apron

    • First Aid Measures:

      • Skin/Eye Contact: Rinse immediately with plenty of water (at least 15 minutes) and seek medical attention

      • Inhalation of Dust: Ensure proper ventilation; use filter respirator in enclosed areas


    Storage and Compatibility

    Parameter Recommended Condition
    Storage Environment Cool, dry, well-ventilated area
    Packaging Moisture-proof triple-layer polypropylene bags (typically 25 kg)
    Compatibility Keep away from acids, light metals, nitrogenous and halogenated organic compounds
    Handling Precautions Avoid contact with water; prevent exposure to moisture and humidity

    Packaging and Transport

    • Standard Packaging: 25 kg moisture-resistant PP bags with inner liner

    • Transportation: Non-flammable but classified as Corrosive (GHS Class 8) — handle with appropriate labeling and containment

    Caustic soda Flakes