Sodium Hydroxide (Caustic Soda - NaOH)
Sodium Hydroxide
“The industrial strength behind soap, paper, and clean water: powerful chemistry in liquid and solid form.” Arnico’s Sodium Hydroxide is the essential, high-purity industrial alkali, available as a 50% liquid solution or solid pearls. It delivers the consistent, powerful reactivity needed for critical processes, from saponification and pH neutralization to kraft pulping and beyond. Produced using modern membrane technology, our mercury-free NaOH stands as the reliable backbone for industries demanding uncompromising quality and performance.
Description More
Sodium Hydroxide (Caustic Soda) ARNICO: The Indispensable Alkali for Industrial Excellence and Process Optimization
Sodium Hydroxide, universally known as Caustic Soda and chemically represented as NaOH, is one of the most fundamental and widely used chemical reagents in the world. Marketed under the trusted brand Caustic Soda ARNICO, this powerful alkali is the workhorse of countless industrial processes. It is not merely a chemical; it is a critical enabler for manufacturing, water treatment, and chemical synthesis. ARNICO’s Caustic Soda is produced through advanced membrane cell electrolysis technology, resulting in a product of exceptional purity, consistency, and clarity. This is a product that underpins the production of everything from the paper we read to the soap we use, the textiles we wear, and the clean water we drink. It is a cornerstone of the modern chemical industry, and ARNICO is committed to delivering it with the highest standards of quality and safety.
The true power of Caustic Soda lies in its extraordinary chemical reactivity as a strong base. It is highly soluble in water, generating considerable heat upon dissolution, and it reacts vigorously with acids, amphoteric metals, and various organic compounds. This versatility makes it an indispensable processing aid and reagent.
ARNICO supplies Sodium Hydroxide in two primary, specialized forms to cater to diverse industrial needs:
1. Caustic Soda Flakes/Pearls (Solid Grade): This form, characterized by white, hygroscopic flakes or spherical pearls, is a highly concentrated source of alkali (typically ≥ 98% NaOH). Its solid form is ideal for industries with precise dosing requirements, where the convenience of manual handling and smaller scale usage is preferred. It is the standard for laboratories, water treatment facilities, and many industrial chemical synthesis processes.
2. Caustic Soda Lye (Liquid Grade, ~50% w/w): This is a concentrated, clear, and viscous aqueous solution of sodium hydroxide, typically supplied at a concentration of 48-50% by weight. The liquid form is the preferred choice for large-scale industrial users due to its ease of handling, pumping, and automated metering into continuous processes. It is the workhorse for high-volume applications in the chemical, pulp & paper, and textile industries.
The decisive competitive advantage of ARNICO Caustic Soda lies in its unwavering purity and consistency. Manufactured using ion-exchange membrane technology, our product is virtually free of chlorides, chlorates, and heavy metal impurities that plague less-refined grades. This high purity is critical for sensitive applications such as pharmaceutical synthesis, food processing, and high-end chemical manufacturing, ensuring both process integrity and final product quality.
Technical Specifications, Guaranteed Analysis, and Grades of ARNICO Sodium Hydroxide
This section presents the engineering foundation and scientific backbone of the product. The table below directly represents ARNICO’s qualitative commitments and forms the definitive basis for the Certificate of Analysis (COA) issued for every production batch. These certified parameters are the primary criteria for evaluation, quality assurance, and formal acceptance of consignments by leading industries worldwide. At ARNICO, quality is a guaranteed, verifiable specification.
Table of Technical Specifications by Grade
| Parameter | Caustic Soda Flakes/Pearls (Solid) | Caustic Soda Lye (Liquid 50%) | Unit | Test Method |
|---|---|---|---|---|
| Appearance | White Flakes, Pearls, or Granules | Clear, Colorless to Slightly Grey Viscous Liquid | – | Visual Observation |
| Total Alkalinity (as NaOH) | ≥ 98.5 | 48.0 – 50.0 | % by weight (w/w) | Acid-Base Titration |
| Sodium Carbonate (as Na₂CO₃) | ≤ 0.8 | ≤ 0.4 | % by weight (w/w) | Titrimetric (Warder Method) |
| Sodium Chloride (as NaCl) | ≤ 0.05 | ≤ 0.02 | % by weight (w/w) | Titrimetric/ICP-OES |
| Iron (as Fe) | ≤ 15 | ≤ 10 | ppm (mg/kg) | Atomic Absorption Spectroscopy (AAS) |
| Heavy Metals (as Pb) | ≤ 10 | ≤ 5 | ppm (mg/kg) | Inductively Coupled Plasma Mass Spectrometry (ICP-MS) |
| Sodium Sulfate (as Na₂SO₄) | ≤ 0.05 | ≤ 0.03 | % by weight (w/w) | Ion Chromatography |
| Specific Gravity @ 20°C | – | 1.52 – 1.53 | g/cm³ | Digital Density Meter |
| Freezing Point | – | ~ 12 | °C | Differential Scanning Calorimetry (DSC) |
Expert Parameter Guide (For Informed and Professional Selection)
A true professional understands that the value of a chemical reagent lies in its purity and consistency. This guide will empower you to make the most informed technical and economic decisions:
Total Alkalinity (as NaOH): The Core of Power. This parameter is the most direct indicator of a product’s strength. For the solid grade, a minimum of 98.5% purity ensures maximum active ingredient content with minimal inert material. For the liquid grade, the 50% concentration is the industry benchmark, balancing high chemical activity with safe handling and manageable freezing points. Higher purity directly translates to more efficient reactions and less by-product formation.
Sodium Carbonate (Na₂CO₃): The Absorber of Carbon Dioxide. This is an impurity formed by the reaction of NaOH with atmospheric carbon dioxide. Its presence reduces the effective alkalinity and can interfere with certain chemical reactions. ARNICO’s strict control over this parameter ensures a more reactive and predictable product, especially critical in pH-sensitive processes.
Sodium Chloride (NaCl): The Corrosion Catalyst. This is a key contaminant, particularly problematic in high-temperature processes or where stainless steel equipment is used, as it significantly accelerates pitting and stress corrosion cracking. The exceptionally low chloride content guaranteed by ARNICO is a testament to its advanced membrane-cell manufacturing process and translates directly to longer equipment life and reduced maintenance costs.
Iron (Fe) and Heavy Metals: The Purity Index. These impurities can discolor final products and catalyze unwanted side reactions. For applications in pharmaceuticals, food processing, and high-value chemical synthesis, the ultra-low levels of metal impurities in ARNICO Caustic Soda are essential to ensure product quality and process integrity.
Technical, Economic, and Operational Advantages of ARNICO Sodium Hydroxide with Proven Industrial Applications
This section moves beyond the technical datasheet to explore the practical benefits and real-world applications that have made ARNICO Caustic Soda a preferred choice for industries globally.
Key Advantages: Why is ARNICO Caustic Soda the Superior Choice?
1. Uncompromising Purity for Critical Applications.
ARNICO Caustic Soda is produced using the most advanced ion-exchange membrane technology, resulting in a product that is virtually free of chlorides, heavy metals, and other contaminants. This “Rayon Grade” or “Membrane Grade” purity is not just a number; it provides a tangible advantage in applications where purity is paramount. It ensures stable reaction chemistries, prevents catalyst poisoning, and guarantees the final product meets the highest standards of purity and safety.
2. Versatile and Consistent Performance for Process Optimization.
As a strong base, Caustic Soda performs multiple functions: pH neutralization, acid gas scrubbing (e.g., removal of HCl, SO₂, H₂S), saponification, and catalysis. The consistency of ARNICO’s product means that these processes can be tightly controlled and optimized, leading to reduced chemical consumption, less waste generation, and improved overall process efficiency.
3. Safe and Efficient Handling in Multiple Forms.
ARNICO provides Caustic Soda in both solid (flakes/pearls) and liquid (50% lye) forms, allowing customers to select the most efficient and safe option for their specific operations. The liquid form is ideal for large-scale, automated systems, minimizing manual handling and exposure risk. The solid form offers convenient, precise dosing for smaller batch operations and applications requiring high purity with minimal water addition.
4. Unmatched Economic Value from High Concentration and Efficiency.
The high concentration of ARNICO’s Caustic Soda (especially in its solid and 50% lye forms) means a lower effective cost per active alkali unit. Its consistent quality and reactivity reduce over-dosing and side reactions, leading to better overall chemical management and lower total cost of ownership.
5. Commitment to Supply Chain Reliability and Support.
By partnering with ARNICO, you gain more than a product; you gain a reliable partner committed to secure, consistent supply. Our team of experts provides technical support to help you optimize your process, from system design for safe handling to troubleshooting application challenges.
Specialized and Proven Fields of Application:
Chemical Processing and Manufacturing:
Neutralization of acidic waste streams and adjustment of pH in reactors.
Production of sodium salts, soaps, and detergents via saponification.
Catalysis and precipitation reactions in organic synthesis.
Pulp and Paper Industry:
Kraft pulping process to dissolve lignin and release cellulose fibers.
Bleaching of wood pulp to achieve high brightness.
Wastewater treatment and pH control.
Water and Wastewater Treatment:
pH adjustment and alkalinity control in municipal and industrial water.
Acidic gas scrubbing (SO₂, HCl) from flue gases.
Regeneration of ion exchange resins.
Textile Industry:
Mercerization of cotton to improve strength, luster, and dye uptake.
Scouring and bleaching of fabrics.
Food and Beverage Industry:
Cleaning-In-Place (CIP) systems for process equipment.
pH control in food processing.
Peeling of fruits and vegetables.
Pharmaceuticals and Cosmetics:
Precise pH adjustment in drug manufacturing.
Saponification for the production of specific soaps and cosmeceuticals.
Safety, Health, and Operational Integrity; The Cornerstone of ARNICO’s Commitment and Your Assurance of a Reliable Partnership
This section is dedicated to the two foundational pillars of ARNICO’s commitment: first, complete transparency and the provision of actionable guidance for safe handling; and second, the exposition of an integrated quality assurance system that elevates our product to a full-fledged engineering solution.
Comprehensive Safety, Handling, and Storage Guide
ARNICO Sodium Hydroxide is a highly corrosive substance, both in solid and liquid form. It causes severe chemical burns upon contact with skin or eyes and is highly reactive, particularly with water, acids, and certain metals. Strict adherence to safety protocols is non-negotiable.
Mandatory Personal Protective Equipment (PPE): Before any handling or operation involving Caustic Soda, the use of the following protective layer is mandatory:
Gloves: Long-sleeved, heavy-duty, chemically resistant gloves made of neoprene, nitrile, or PVC.
Eye and Face Protection: Full-seal chemical safety goggles (Goggles) in conjunction with a full-face shield (Face Shield) to protect against splashes of this highly corrosive substance.
Body Protection: A full-length, acid/alkali-resistant apron or suit (e.g., made of PVC or rubber) and rubber boots.
Respiratory Protection: If there is potential for dust generation (solid form) or mist/aerosol (liquid form), use a respirator with appropriate cartridges for alkaline dust and mist.
Critical Safety Hazard: Chemical Burns and Exothermic Reaction.
Chemical Burns: This is the most significant hazard. Caustic Soda causes deep, penetrating burns that may not be immediately painful. Immediate and thorough flushing with water is critical.
Exothermic Reaction with Water: NEVER add water to Caustic Soda; ALWAYS add Caustic Soda slowly to water while stirring. This “Add the Chemical to Water” rule is essential to prevent a violent boiling reaction and splashing of the corrosive solution.
Emergency Procedures and First Aid Measures:
On Skin: Immediately remove all contaminated clothing. Flush the affected skin area continuously with copious amounts of cool, clean water for a minimum of 20-30 minutes. Seek immediate medical attention for any chemical burn.
In Eyes: This is an emergency. Immediately rinse the eyes thoroughly, holding the eyelids open, with a gentle but continuous stream of lukewarm water for at least 20-30 minutes. In all cases of eye contact, immediate and urgent transportation to a specialized ophthalmologist is mandatory.
Inhalation: Immediately move the affected person to fresh, open air. If coughing, chest tightness, or difficulty breathing persists, seek immediate medical attention.
Accidental Ingestion: Rinse the mouth thoroughly with plenty of water. Do NOT induce vomiting. If the person is fully conscious, give them small amounts of milk or water to drink. Call emergency medical services immediately.
Golden Rules for Optimal Storage and Handling:
Liquid Grade: Store in dedicated, ventilated, and contained areas. Tanks should be constructed of compatible materials such as stainless steel, polyethylene (HDPE), or fiberglass-reinforced plastic (FRP). Never use aluminum, tin, or zinc tanks. A secondary containment dike is essential. The freezing point of 50% lye is approximately 12°C, so storage tanks and lines may require heat tracing or insulation in cold climates.
Solid Grade: Caustic Soda flakes and pearls are highly hygroscopic (moisture-absorbing) and will absorb water and CO₂ from the air, leading to caking and loss of reactivity. Bags must be kept sealed and stored in a strictly dry, cool, and well-ventilated warehouse.
This product must be stored isolated from incompatible materials, including strong acids, flammable liquids, and reactive metals (like aluminum, zinc, and tin). Contact with acids generates significant heat.
Safety Data Sheet (SDS): The complete and official Safety Data Sheet, compliant with the Globally Harmonized System (GHS), including all 16 standard sections, is always available for download on the official ARNICO website. It is a legal and professional imperative that all employers and safety officers study this document thoroughly.
ARNICO’s Quality Assurance System and Technical Services; Beyond Being Just a Supplier
Quality assurance at ARNICO is a holistic, end-to-end process that starts with raw material selection and continues through to post-sale technical support.
Guaranteed Certificate of Analysis (COA): Every consignment of an ARNICO product is accompanied by its own unique, batch-specific COA. This certificate contains the actual results of laboratory analyses, verifying key parameters such as total alkalinity, sodium chloride content, and heavy metal concentrations, guaranteeing the product’s full conformity to our stringent specifications.
Expert On-Site Technical and Engineering Services: Our team of experienced specialists will serve as your dedicated technical arm, providing invaluable support including:
Safe Handling and System Design Consultation: Advising on the correct design and selection of storage tanks, pumps, and piping materials for safe and reliable handling of Caustic Soda.
Dilution and Dosing Optimization: Providing guidance on the proper methods for diluting concentrated solutions to the required working strength.
Periodic Site Visits and Continuous Performance Monitoring: Ensuring the long-term, stable quality of the product and proactively addressing any technical queries.
For more information, to request a free expert technical consultation, to ask for a sample COA, or to place an order, please visit the ARNICO website and contact our commercial and technical specialists. ARNICO: Your Trusted Partner for Clarity and Sustainable Quality.
Technical documents for Sodium Hydroxide products, including Technical Data Sheet (TDS), Material Safety Data Sheet (MSDS), and Certificate of Analysis (COA), are available to customers upon request.
To receive these documents and additional information, please contact the company’s technical or sales department or contact us via email.
Commitment to Arnico quality; production cycle Sodium Hydroxide
Trust of Major Industries in Arnico
Stable supply and strong logistics chain
With Arnico, production stoppages are a thing of the past. Our global supply network and strategic warehouses ensure that your raw materials are supplied on time and without interruption, even amidst market fluctuations.
Quality assurance with a valid Certificate of Analysis (COA)
Every shipment of Arnico is shipped with a dedicated analysis sheet. Ensure full compliance with international standards before unloading. Our transparency is your peace of mind.
Transparent pricing and elimination of unnecessary intermediaries
Direct sourcing and eliminating intermediaries has brought our prices closer to global rates. With Arniko, you will experience smart, economical, and completely transparent shopping.
Specialized technical advice; beyond a supplier
Arnico’s technical team is by your side before you make a purchase. From selecting the right grade to sample analysis, our detailed, complimentary consultation guides you toward the best decision. Arniko—your technical partner on the path to growth.
Quick Guide to Buying Sodium Hydroxide
What is the minimum order quantity (MOQ)? Is it possible to make a trial purchase?
The minimum order quantity (MOQ) for Sodium Hydroxide is one ton (1000 kg) equivalent to 40 bags of 25 kg. However, for new buyers, Arniko offers a trial batch of 200 to 500 kg at a special price to test the quality of the product in its production line. Samples of 1 to 5 kg are also sent free of charge to accredited customers. For purchases of more than 5 tons, a significant volume discount is applied.
What documents and certificates do you provide to ensure quality?
Arnico provides the following complete package of documents for each shipment:Certificate of Analysis (COA)from a National Standards Organization accredited laboratory
Commercial with full specifications
ISO 9001:2015 certificate (quality management) and ISO 14001 (environmental management)
NSF/ANSI 60 approval for food grade (suitable for drinking water)
SGS or Bureau Veritas inspection certificate can also be provided upon request All these documents will be provided to the buyer for final approval before loading, and in case of non-compliance, the buyer has the right to cancel.
What are the payment methods and transaction guarantees for foreign buyers?
Yes. Food Grade Sodium Hydroxide is FDA approved and meets NSF/ANSI 60 standards for use in drinking water treatment. Products supplied by Arnico are completely free of harmful heavy metals (such as arsenic, mercury and lead) and come with accurate laboratory analysis. We provide a certified Certificate of Analysis (COA) for every export shipment.
What is the delivery time and shipping cost to different destinations?
The order delivery time is as follows:
Stock orders: Maximum 5 to 7 business days after receiving the advance payment
Production orders (custom): Maximum 15 to 21 business days
Sea export: Depending on Destination, 20 to 45 days plus shipping time
Shipping cost is calculated in two ways:
FOB (port of origin): includes product price + loading in Bandar Abbas, Asaluyeh or Imam Khomeini
CIF (port of destination): includes cost price + sea freight + insurance to port of destination
Arnico Logistics Team cooperates with 3 reputable international shipping companies and calculates the best rates for neighboring countries, Central Asia, Africa, Europe and China. Also, the exact production and shipping schedule is announced to the buyer on a weekly basis so that the purchasing planning process is completely transparent.
We are answering your questions.
Your satisfaction is our credit.
Our support team, consisting of experienced experts, is ready to answer your questions and challenges in the shortest possible time. Our goal is to provide you with a precise and practical solution.