Sodium Hypochlorite 5.25%

Product Overview

Sodium Hypochlorite 5.25% (Technical Grade) is a clear, pale yellow liquid solution of NaOCl formulated for robust industrial performance. This 5.25% w/w hypochlorite solution provides a strong oxidizing capability with a high available chlorine content, typically assayed between 5.0 and 5.5% by titration with standardized NaOH. The product is designed for reliability in water treatment, pH adjustment, and oxidative processes, where consistent concentration control, alkaline pH, and effective disinfection are required. The solution demonstrates a density near 1.08 g/mL at 25°C and a molecular weight of 74.44 g/mol, with a typical refractive index dependent on concentration and temperature. This material is compatible with HDPE or glass containment and is intended for industrial and institutional use in accordance with the applicable SDS and regulatory standards.

In practice, the 5.25% sodium hypochlorite solution acts as a strong oxidizing agent suitable for treating drinking water and wastewater, helping to control microbial growth while facilitating pH adjustment in various chemical processes. Its alkaline nature enhances stability in storage and application, though it requires careful handling to prevent degradation from heat, acids, catalysts, or incompatible materials. The product is intended for use in controlled environments with appropriate PPE, ventilation, and adherence to standard operating procedures, and it should be used in accordance with regional regulations and internal quality controls.

Key Properties

• Property Name: Assay Wt %
• Chemical Formula: NaOCl
• Molecular Weight: 74.44 g/mol
• Boiling Point: N/A
• Specific Gravity (20°C): 1.07–1.12 (typical 1.09)
• Appearance: Clear, pale yellow liquid
• Odor: Chlorine-like odor
• Density (25°C): 1.08 g/mL
• Chlorine Content (Available Cl): 5.0–5.5% (typical 5.25%)
• Water Content: Water content specific test - max 0.5%
• pH (uncorrected): Alkaline (pH dependent on concentration)
• Residue after Ignition: 0.1% max (typical 0.05%)
• Chloride (Cl⁻): ≤ 2000 ppm (typical 1000 ppm)
• Nitrate (NO₃⁻): ≤ 100 ppm (typical 40 ppm)
• Ammonium (NH₄⁺): ≤ 30 ppm (typical 10 ppm)
• Sulfate (SO₄²⁻): ≤ 1000 ppm (typical 500 ppm)
• Phosphate (PO₄³⁻): ≤ 200 ppm (typical 50 ppm)
• Arsenic (As): ≤ 0.01 ppm (typical 0.005 ppm)
• Heavy Metals (Pb, Sn, etc.): ≤ 0.5 ppm total (typical 0.2 ppm)
• Iron (Fe): ≤ 0.5 ppm (typical 0.1 ppm)
• Copper (Cu): ≤ 0.5 ppm (typical 0.1 ppm)
• Manganese (Mn): ≤ 0.5 ppm (typical 0.1 ppm)
• Nickel (Ni): ≤ 0.2 ppm (typical 0.05 ppm)
• Potassium (K): ≤ 500 ppm (typical 150 ppm)
• Sodium (Na): ≤ 2000 ppm (typical 1000 ppm)

Common Applications

• Water Treatment: Industrial and municipal water systems use to control microbial growth and maintain disinfection residuals in drinking water and wastewater treatment processes.
• pH Adjustment: Serves as a alkaline agent in chemical processes requiring controlled pH shifts and sanitation steps within production streams.
• Bleaching Agent: Applied in textile and paper processing for fabric whitening and pulp bleaching under controlled conditions.
• Oxidizing Agent: Facilitates oxidative reactions in chemical synthesis and process sanitation, enabling contaminant oxidation and residual management.
• Laboratory Reagent: Used in analytical methods and sample preparation where a robust oxidizing environment is required.

Safety Precautions

Handling and storage should follow established SDS guidance. Store in a cool, dry place away from direct sunlight in compatible containers (HDPE or glass). Use PPE including chemical-resistant gloves, splash goggles, and appropriate protective clothing. Ensure adequate ventilation to prevent accumulation of vapors and to minimize inhalation exposure. Keep away from acids and reducing agents to avoid hazardous reactions and gas evolution. Do not mix with incompatible materials and follow standard operating procedures for loading, handling, and transfer to prevent spills or splashes.

Additional safety considerations include monitoring exposure limits, maintaining secondary containment for spills, and having emergency eyewash and safety showers accessible. In case of contact with skin or eyes, rinse with copious amounts of water for several minutes and seek medical attention as needed. If inhaled or ingested, follow the SDS-directed emergency procedures and contact poison control or medical personnel immediately. Transport as UN 1791, Hypochlorite solutions, Class 8, PG II.

Benefits

✔ High available chlorine (5.25%) – Reliable oxidizing performance for disinfection, sanitization, and process control.
✔ Consistent specification – Tight assay, trace metal limits, and low residue support repeatable results across batches.