1-Quart plastic bottle of Alliance Chemical Sodium Bisulfite 40% with a ribbed neck, white cap, and product label.
1-quart HDPE bottle of Sodium Bisulfite 40% solution by Alliance Chemical
Four 1-quart Alliance Chemical Sodium Bisulfite 40% HDPE bottles with white ribbed caps and product labels.
Four 1-gallon HDPE jugs of Alliance Chemical Sodium Bisulfite 40% with white caps and product labels, inside shipping box.
Alliance Chemical company logo
One 5-gallon HDPE jug of Alliance Chemical Sodium Bisulfite 40% with a white cap, integrated handle, and product label.
15-gallon HDPE carboy of Sodium Bisulfite 40% solution with chemical, white handle, and Alliance Chemical label
55-gallon HDPE drum of Sodium Bisulfite 40% solution by Alliance Chemical
One 330-gallon tote of Alliance Chemical Sodium Bisulfite 40% with a steel cage and a white plastic container with a label.
15x 5-gallon poly pails of 40% sodium bisulfite solution stacked on pallet, Alliance Chemical branded containers
Seven 1-quart plastic bottles of Alliance Chemical Sodium Bisulfite 40% with white screw caps and safety label
Alliance Chemical One-gallon HDPE container of Sodium Bisulfite 40% solution, with NFPA diamond, safety instructions
2-gallon HDPE jugs of Sodium Bisulfite 40% solution by Alliance Chemical NFPA diamond, and chemical hazard symbols
275-gallon IBC tote of Sodium Bisulfite 40% industrial chemical solution , and Alliance Chemical safety labeling
4x55 gallon HDPE drums of Sodium Hydroxide 50% (Caustic Soda), Alliance Chemical branded labels, and secure screw caps
One 330-gallon Alliance Chemical Sodium Bisulfite 40% tote with a white plastic container and steel cage.

Sodium Bisulfite 40%

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Sodium Bisulfite 40%

$19.05
1-Quart plastic bottle of Alliance Chemical Sodium Bisulfite 40% with a ribbed neck, white cap, and product label.
1-quart HDPE bottle of Sodium Bisulfite 40% solution by Alliance Chemical
Four 1-quart Alliance Chemical Sodium Bisulfite 40% HDPE bottles with white ribbed caps and product labels.
Four 1-gallon HDPE jugs of Alliance Chemical Sodium Bisulfite 40% with white caps and product labels, inside shipping box.
Alliance Chemical company logo
One 5-gallon HDPE jug of Alliance Chemical Sodium Bisulfite 40% with a white cap, integrated handle, and product label.
15-gallon HDPE carboy of Sodium Bisulfite 40% solution with chemical, white handle, and Alliance Chemical label
55-gallon HDPE drum of Sodium Bisulfite 40% solution by Alliance Chemical
One 330-gallon tote of Alliance Chemical Sodium Bisulfite 40% with a steel cage and a white plastic container with a label.
15x 5-gallon poly pails of 40% sodium bisulfite solution stacked on pallet, Alliance Chemical branded containers
Seven 1-quart plastic bottles of Alliance Chemical Sodium Bisulfite 40% with white screw caps and safety label
Alliance Chemical One-gallon HDPE container of Sodium Bisulfite 40% solution, with NFPA diamond, safety instructions
2-gallon HDPE jugs of Sodium Bisulfite 40% solution by Alliance Chemical NFPA diamond, and chemical hazard symbols
275-gallon IBC tote of Sodium Bisulfite 40% industrial chemical solution , and Alliance Chemical safety labeling
4x55 gallon HDPE drums of Sodium Hydroxide 50% (Caustic Soda), Alliance Chemical branded labels, and secure screw caps
One 330-gallon Alliance Chemical Sodium Bisulfite 40% tote with a white plastic container and steel cage.
Who Buys This
  • Water treatment facilities
  • Food processing companies
  • Photography labs
  • Chemical manufacturers
  • Textile processing plants
Grade Guide
  • Industrial & commercial applications
  • 39-41% assay verified by COA
  • Ready-to-use liquid solution
  • Eliminates on-site mixing steps
Pack Sizes
  • 1 Quart: lab & small jobs
  • 1 Gallon: shop & maintenance
  • 5 Gallon: production & regular use
  • 15 Gallon: mid-volume operations
  • 55 Gallon: bulk drum
  • 275 Gallon: high-volume tote
  • 330 Gallon: max-volume tote
Docs Included
  • UN 2693 Class 8 packaging
  • SDS with every shipment
  • COA showing 39-41% assay
  • pH & purity specifications included
  • Description
  • Product Documents
  • Chemical Profile

Product Overview

Sodium Bisulfite 40% (Sodium Hydrogen Sulfite, NaHSO₃) 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 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
  • 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

Property Value
Molecular Weight 104.06 g/mol
Formula NaHSO3
Assay 40%
Grade Technical
Form Liquid
Solubility Soluble in water and alcohol
Appearance Clear, colorless to pale yellow liquid
Specific Gravity 1.36
Industry Industrial, Environmental, Wastewater

Frequently Asked Questions About Sodium Bisulfite 40%

What is Sodium Bisulfite 40% and what is its chemical formula?
Sodium Bisulfite 40% is a chemical compound with the molecular formula NaHSO3, registered under CAS Number 7631-90-5 by the Chemical Abstracts Service (PubChem), with a molecular weight of 104.06 g/mol. Alliance Chemical supplies Sodium Bisulfite 40% in Technical grade for laboratory, industrial, and commercial applications.
What are the physical properties of Sodium Bisulfite 40%?
According to the NIOSH Pocket Guide to Chemical Hazards, Sodium Bisulfite 40% is supplied as a clear, colorless to pale yellow liquid. The specific gravity is 1.36 relative to water. Solubility: Soluble in water and alcohol.
What grade and purity of Sodium Bisulfite 40% does Alliance Chemical offer?
Alliance Chemical offers Sodium Bisulfite 40% in Technical grade with a purity assay of 40%. Every lot ships with a Certificate of Analysis (COA) and Safety Data Sheet (SDS) prepared in accordance with OSHA Hazard Communication Standard 29 CFR 1910.1200 and GHS Revision 7. Download SDS.
What are common industrial applications of Sodium Bisulfite 40%?
Sodium Bisulfite 40% serves a wide range of sectors, including Industrial, Environmental, and Wastewater.Alliance Chemical provides the documentation and quality certifications required for use in regulated environments.
What PPE is required when handling Sodium Bisulfite 40%?
OSHA-mandated PPE per 29 CFR 1910.132-138:Chemical-resistant gloves (nitrile/neoprene), safety goggles, lab coat, closed-toe chemical-resistant footwear. Emergency eyewash station and safety shower must be accessible within 10 seconds per ANSI Z358.1. Consult the SDS available from Alliance Chemical for complete PPE requirements.
What are the storage requirements for Sodium Bisulfite 40%?
Store perOSHA standards: Cool, dry, ventilated area. Temperature range:15-25°C. Segregate from:incompatible materials per SDS Section 10. Maximum storage:2-3 years unopened.
What is the emergency spill procedure for Sodium Bisulfite 40%?
Emergency response per EPA SPCC (40 CFR 112) and OSHA 29 CFR 1910.120: (1) Alert personnel, evacuate area to 50 feet. (2) Eliminate ignition sources if flammable. (3) Don PPE per SDS Section 8. (4) Stop leak if safe; use emergency shutoffs. (5) Contain with non-combustible absorbent materials, dike with sand/earth. (6)Absorb with vermiculite or commercial spill kits. (7) Collect in DOT-approved containers, label as hazardous waste. Check 40 CFR 302.4 for Reportable Quantity. Emergency: Chemtel 1-800-255-3924 (24/7). Non-emergency: Alliance Chemical 512-365-6838.
How must Sodium Bisulfite 40% waste be disposed?
Disposal per RCRA (40 CFR 261-265):Evaluate per 40 CFR 261. Generator requirements: EPA ID number required if >100 kg/month (40 CFR 262.12). Use EPA-permitted Treatment, Storage, Disposal Facility (TSDF). Never discharge to sewer without POTW written approval (40 CFR 403). Container disposal: Triple rinse (40 CFR 261.7), offer for reconditioning/recycling. State regulations may be more stringent — check with your local environmental agency. Consult the Alliance Chemical SDS for product-specific disposal guidance.
Does Alliance Chemical provide an SDS and COA for Sodium Bisulfite 40%?
Yes. Alliance Chemical provides a Safety Data Sheet (SDS) and Certificate of Analysis (COA) for every lot of Sodium Bisulfite 40%. The SDS is prepared in accordance with OSHA Hazard Communication Standard 29 CFR 1910.1200 and the Globally Harmonized System (GHS) Revision 7, covering all 16 required sections including hazard identification, first aid measures, firefighting measures, handling and storage, exposure controls, and regulatory information. The SDS is available for download directly from this product page. COAs are available upon request by contacting Alliance Chemical at 512-365-6838.

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