Sodium Hydroxide 25%

Product Overview

Sodium Hydroxide 25% is a highly alkaline aqueous solution of NaOH, formulated to deliver consistent reactivity across diverse industrial processes. The solution is designed for precise pH control, offering strong basicity with stable composition suitable for large-volume applications in water treatment, chemical manufacturing, and laboratory settings. Its robust caustic properties enable efficient saponification, neutralization, and pH adjustment while maintaining compatibility with common process streams when handled under proper safety protocols. This product meets ACS Reagent Grade and USP-NF Monograph standards, underscoring its suitability for both industrial and research applications where purity, consistency, and trace metal control are essential.

In addition to pH adjustment, Sodium Hydroxide 25% serves as a key reagent in synthesis and cleaning workflows, providing reliable performance in saponification processes and as a reagent in analytical chemistry. The material is supplied with strict quality controls to minimize impurities (e.g., heavy metals and chlorides) and is delivered with clear specifications for assay, color, and residue, enabling traceable batch-to-batch performance in regulated environments. Proper storage, handling, and adherence to SDS guidance ensure safe, predictable operation when integrated into existing process streams.

Key Properties

• Appearance: Clear, colorless to slightly yellow liquid
• Chemical Formula: NaOH
• Molecular Weight: 40.00 g/mol
• Boiling Point: 100°C
• Specific Gravity (25°C): 1.24 (typical; range 1.18–1.30)
• Assay (wt %): 24.5–25.5; typical 25; test method: Titration with standardized NaOH
• Residue After Ignition: ≤ 0.005% (typical 0.001%); test method: Gravimetric after ignition
• Chloride (ppm): ≤ 20 (typical 5); test method: Ion Chromatography
• Nitrate NO₃⁻ (ppm): ≤ 50 (typical 10); test method: Ion Chromatography
• Ammonium NH₄⁺ (ppm): ≤ 5 (typical 1); test method: Ion Chromatography
• Sulfate SO₄²⁻ (ppm): ≤ 50 (typical 10); test method: Ion Chromatography
• Phosphate PO₄³⁻ (ppm): ≤ 20 (typical 5); test method: Ion Chromatography
• Arsenic As (ppm): ≤ 0.1 (typical 0.02); test method: ICP-MS
• Heavy Metals As Pb (ppm): ≤ 0.5 (typical 0.1); test method: ICP-MS
• Iron Fe (ppm): ≤ 0.5 (typical 0.05); test method: ICP-OES
• Copper Cu (ppm): ≤ 0.5 (typical 0.05); test method: ICP-OES
• Magnesium Mg (ppm): ≤ 50 (typical 5); test method: ICP-OES
• Sodium Na (ppm): ≤ 0 (typical 0); test method: Direct weight percent calculation
• Calcium Ca (ppm): ≤ 50 (typical 5); test method: ICP-OES
• Sodium Hydroxide Availability (wt % NaOH): 24–26 (typical 25); test method: Titration/back-titration

Common Applications

• pH Adjustment: Water Treatment — neutralizes acidic streams to maintain compliance with discharge and process parameters; enables stable buffer systems in distribution networks.
• Chemical Manufacturing: Industrial — essential reactant for soap and detergent production, polymer processing, and various synthesis routes requiring strong base catalysis.
• Saponification: Pharmaceutical/Soap Production — drives ester hydrolysis and soap formation, enabling formulation of surfactants and cleaners.
• Laboratory Reagent: Research — widely used as a robust reagent in analytical protocols, sample preparation, and pH titrations.
• Cleaning Agent: Industrial Cleaning — effectively saponifies fats and oils, clears organic residues in equipment and process lines.

Safety Precautions

Handling Sodium Hydroxide 25% requires appropriate PPE including chemical-resistant gloves, splash-rated goggles or face shield, and chemical-resistant apron or suit. Store in cool, dry, well-ventilated areas away from acids and incompatible materials, using containers made of HDPE or glass. Ensure containment to prevent spills and provide adequate ventilation to avoid vapor exposure, particularly during transfer. Regularly inspect containers for signs of degradation and keep away from moisture to preserve product integrity.

Emergency procedures include immediate irrigation with large quantities of water for skin or eye contact, followed by medical assessment. In case of inhalation, remove to fresh air and seek medical attention if symptoms persist. For ingestion, rinse mouth and do not induce vomiting; seek medical care promptly. In the event of a spill, evacuate personnel, contain the spill with compatible absorbent material, and dispose of according to local regulations. Refer to SDS for comprehensive safety guidance.

Benefits

✔ High Purity and Consistency – ACS Reagent Grade and USP-NF compliant, with strict heavy metal and contaminant controls ensuring reliable batch-to-batch performance.
✔ Effective Alkalinity Management – strong base activity enables rapid pH adjustment and neutralization across diverse process streams.
✔ Wide Industry Compatibility – suitable for water treatment, chemical manufacturing, saponification, and laboratory applications with well-defined specifications.