Caustic soda supplier in Pakistan
technical guide & specifications
Caustic soda, or sodium hydroxide, is one of the most important industrial alkalis used across textiles, soap and detergent production, water treatment, paper and pulp, food processing, chemical manufacturing, oil refining, and pharmaceuticals. This guide covers chemistry, grades, industrial applications, storage, and sourcing for Pakistani buyers.
Typical purity for commercial caustic soda flakes and pearls used in industry.
A 1% solution is strongly alkaline, which is why strict handling and dosing control matter.
Liquid soda lye is one of the most commonly used industrial forms for large-scale operations.
What is caustic soda?
Caustic soda, scientifically known as sodium hydroxide (NaOH), is a white inorganic compound that dissolves readily in water to form a strongly alkaline solution. It is also commonly known as lye or soda lye.
The term “caustic” reflects its intensely corrosive nature. At high concentrations, sodium hydroxide can cause severe burns to skin, eyes, and other exposed tissue. That same reactivity, however, is what makes it one of the most widely used chemicals in modern industry.
In Pakistan, caustic soda is essential across textiles, soap and detergent manufacturing, water treatment, paper and pulp, chemical production, edible oil refining, rayon and viscose processing, food-grade lye applications, and pharmaceuticals.
Chemical & physical properties
| Property | Value |
|---|---|
| Chemical name | Sodium Hydroxide |
| Common names | Caustic Soda, Lye, Soda Lye |
| Chemical formula | NaOH |
| CAS Number | 1310-73-2 |
| Molecular weight | 40.00 g/mol |
| Appearance | White solid (flakes / pellets), colourless liquid (solution) |
| pH (1% solution) | ~13 |
| Melting point | 318°C |
| Boiling point | 1,388°C |
| Solubility in water | Highly soluble (111 g / 100 mL at 20°C) |
| Density (solid) | 2.13 g/cm³ |
| EINECS No. | 215-185-5 |
| UN Number | 1823 (solid), 1824 (solution) |
| Hazard class | Class 8 (Corrosive) |
How caustic soda is made
Nearly all commercial caustic soda is produced through the chloralkali process, where sodium chloride solution (brine) is electrolysed to generate sodium hydroxide, chlorine, and hydrogen.
| Production method | Description | Status |
|---|---|---|
| Mercury cell | Uses mercury cathode and produces high-purity NaOH | Being phased out globally |
| Diaphragm cell | Uses asbestos or polymer diaphragm; lower energy cost | Still in use but declining |
| Membrane cell | Uses ion-exchange membrane; efficient and environmentally preferred | Current industry standard in Pakistan and globally |
Available grades & forms
| Form | Concentration | Common use |
|---|---|---|
| Flakes | 98–99% NaOH | Textile processing, soap manufacturing, food-grade applications |
| Form | Concentration | Common use |
|---|---|---|
| Pearls / Pellets | 98–99% NaOH | Laboratory use, pharmaceuticals, precise dosing applications |
| Form | Concentration | Common use |
|---|---|---|
| Liquid (Soda Lye) | 31% or 50% NaOH | Water treatment, paper mills, large-scale industrial processes |
| Form | Concentration | Common use |
|---|---|---|
| Powder | 97–98% NaOH | Drain cleaners, chemical manufacturing |
Industrial applications in Pakistan
Textile industry
Used in mercerization, scouring, dyeing, and finishing. High-purity flake caustic soda is widely used in Pakistan’s textile export sector.
Soap & detergent
Essential for saponification of fats and oils, pH adjustment, surfactant production, and sodium silicate manufacture.
Water treatment
Used for pH correction, heavy metal precipitation, corrosion control, and industrial effluent treatment.
Paper & pulp
Supports Kraft pulping, de-inking, bleaching, and recycled paper processing operations.
Chemical manufacturing
Acts as a raw material in bleach, sodium phenolate, epoxy intermediates, polycarbonates, acids, and solvent-related chemistry.
Pharmaceuticals
Used for pH control, regulated synthesis, and selected active and excipient manufacturing processes.
Food processing
Food-grade lye is used in curing olives, pretzels, noodles, and selected controlled food-processing applications.
Vegetable oil & ghee
Used in refining steps to neutralize free fatty acids and support edible oil processing.
Other industrial uses
Also used in oil and gas, rayon and viscose manufacture, synthetic rubber processing, and other alkaline industrial operations.
Why buy from us
Consistent supply
We work with trusted domestic and import-linked manufacturers to reduce supply disruption risks for industrial buyers.
Multiple forms available
We support buyer requirements for flakes, pearls, powder, and liquid soda lye depending on plant process needs.
Transparent commercial terms
Competitive, market-aware pricing and clear logistics support help buyers manage commodity procurement more confidently.
Technical support
We help buyers understand grade, concentration, and safe-use requirements whether they are plant engineers or procurement teams.
Industrial-grade reliability
Suitable for repeat procurement across textile, chemical, paper, soap, and treatment-related operations.
Nationwide delivery
We deliver across major industrial cities and manufacturing zones throughout Pakistan.
Supplying caustic soda across Pakistan
We support buyers across Pakistan for textile, soap, paper, water treatment, edible oil, chemical, pharmaceutical, and industrial applications. Supply can be arranged for major production and trading hubs depending on form, concentration, and quantity required.
Storage, handling & safety
Storage guidance
- Store in a cool, dry, well-ventilated area
- Keep flakes and pearls away from moisture because they are hygroscopic
- Use sealed polyethylene or suitable carbon steel containers
- Avoid aluminium, zinc, and tin due to reactive hydrogen-gas generation
- Maintain storage temperatures below 40°C where possible
- Keep product segregated from incompatible acids and reactive materials
Handling precautions
- Wear chemical-resistant gloves, goggles, face shield, and protective clothing
- When diluting, always add NaOH to water — never water to NaOH
- Control the heat generated during dilution and transfer
- Maintain eyewash stations and emergency showers close to work areas
Frequently asked questions
AMZ Industries — supply notes
We support caustic soda buyers across Pakistan for textile, soap and detergent, paper, water treatment, edible oil, chemical manufacturing, food-processing, and general industrial applications. Available forms may include flakes, pearls, powder, and liquid soda lye depending on your operational requirement.
Supply can be arranged in industrial packaging with support for bulk and repeat procurement. We work with trusted domestic and import-linked channels to support buyers in Lahore, Karachi, Faisalabad, Gujranwala, and other major industrial zones across Pakistan.
