Sodium Bisulfite 40%

Product Overview

Sodium Bisulfite 40% (Sodium Hydrogen Sulfite, NaHSO₃) Technical Grade is a clear, pale yellow liquid solution widely used as a reducing agent and oxygen scavenger in industrial applications. With a concentration of roughly 40% w/w, this solution offers a stable and efficient source of sulfur dioxide for chemical processing without the handling risks associated with gaseous SO₂. It functions effectively as an antichlor in water treatment facilities, neutralizing residual chlorine before discharge or further processing.

Beyond water treatment, Sodium Bisulfite 40% is utilized in metal finishing for chromium reduction, textile processing as a bleach neutralizer, and in photographic applications. The technical grade specification ensures consistent reactivity and specific gravity (approx. 1.25 g/mL), making it suitable for automated dosing systems in large-scale plant operations. This product is manufactured to minimize heavy metal impurities, ensuring reliable performance in synthesis and waste treatment workflows.

Key Properties

• CAS: 7631-90-5
• Appearance: Colorless to pale yellow liquid
• Chemical Formula: NaHSO₃
• Grade: Technical
• Assay (NaHSO₃): 39% – 41%
• Specific Gravity: 1.25 g/mL (Typical at 25°C)
• pH: Acidic (3.5 - 5.0 typical)
• Solubility: Completely soluble in water
• Odor: Slight sulfurous odor

Common Applications

• Water Treatment: Functions as a dechlorination agent to remove residual chlorine and ozone from municipal and industrial wastewater streams.
• Metal Finishing: Used to reduce Hexavalent Chromium to Trivalent Chromium in plating wastewater treatment.
• Textile Industry: Acts as an "antichlor" to neutralize bleach residues and improve fabric quality during processing.
• Chemical Manufacturing: Serves as a reducing agent and intermediate in the synthesis of organic chemicals and polymers.
• Boiler Treatment: Utilized as an oxygen scavenger to prevent corrosion in boiler water systems.

Safety & Handling

Sodium Bisulfite 40% is a corrosive liquid and a reducing agent. Appropriate Personal Protective Equipment (PPE) is required during handling, including chemical-resistant gloves, splash goggles, and protective clothing. Ensure adequate ventilation to avoid inhaling vapors, as the product releases sulfur dioxide gas upon contact with acids.

Storage: Store in a cool, dry, well-ventilated area in corrosion-resistant containers (HDPE, fiberglass, or rubber-lined steel). Keep away from strong oxidizing agents, acids, and heat sources to prevent decomposition. Refer to the Safety Data Sheet (SDS) for detailed emergency response and disposal procedures.

Shipping Info: UN 3265, Corrosive liquid, acidic, organic, n.o.s. (Sodium Bisulfite), 8, PG II.

Related Products

• Sodium Bisulfite 40% ACS Grade
• Aluminum Sulfate 50%
• Calcium Chloride