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Sodium Bisulfite

Sodium Bisulfite

CAS Number: 7631-90-5

Molecular Formula: NaHSO3

Sulfite-Based Antioxidant & PreservativeDechlorination AgentDual Grade (Industrial&Food)FDA Permissible 21CFRReach Registered

About Sodium Bisulfite

Sodium Bisulfite is a sulfur-based compound used as a reducing agent, antioxidant, and preservative in various industrial, food, and pharmaceutical applications. It effectively prevents oxidation and microbial growth in aqueous systems. Also referred to as (Sodium hydrogen sulfite Sodium bisulphite) by speciality chemi...

Synonyms

  • sodium bisulfite
  • SODIUM BISULFITE
  • 7631-90-5
  • Sodium hydrogen sulfite
  • sodium hydrogensulfite
View all

Sodium Bisulfite Specifications

CAS Number
7631-90-5
Molecular Formula
NaHSO3
IUPAC Name
sodium;hydrogen sulfite or Sodium hydrogen sulfite
Canonical SMILES
OS(=O)[O-].[Na+]
InChI Key
DWAQJAXMDSEUJJ-UHFFFAOYSA-M
InChI
1S/Na.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+1;/p-1
PubChem CID
23665763
EINECS Number
231-548-0
FEMA Number
3021 (for food use, regulated)
MDL Number
MFCD00149113
UNSPSC Code
MFCD00149113
eClass
38150501
NACRES
NA.22
HSN No
28321010
Appearance
White to yellowish crystalline powder
Na2S2O5 (calculated by dry base) %
97.28%
Solubility
Highly soluble in water
density
1.48 at 68 °F (USCG, 1999) - Denser than water; will sink
pH (5% water soluble)
4.6
Odor
Slight sulfur dioxide odor
GHS Classification
Skin Irritation: Category 2 Eye Irritation: Category 2A Respiratory Sensitization: Category 1
Hazard Statements
H315: Causes skin irritation. H319: Causes serious eye irritation. H334: May cause allergy or asthma symptoms if inhaled.
Precautionary Statements
P261: Avoid breathing dust. P280: Wear protective gloves/eye protection. P342+P311: If breathing difficulties occur: call a POISON CENTER.

Water Treatment

Dechlorination and removal of dissolved oxygen.

Food Industry

Preservative for fruits, vegetables, and wine (regulated levels).

Textile & Leather

Used in dyeing processes and as a bleaching agent.

Pharmaceuticals

Stabilizer and antioxidant in formulations.

Chemical Industry

Reducing agent in chemical synthesis.

Storage

Cool, dry place in sealed containers

Stacking

2–3 bags high on pallets

Transport

UN certified packaging for chemicals

Packaging

25 kg bags, 50 kg drums

Shelf life

12 months (dry, sealed storage)

COA
Download
  1. sodium bisulfite
  2. SODIUM BISULFITE
  3. 7631-90-5
  4. Sodium hydrogen sulfite
  5. sodium hydrogensulfite

Sodium Bisulfite FAQs

Minimum Order Quantity

25 kg (evaluation) · 1 MT (commercial)

Lead Time

3 – 5 weeks estimated

Delivery Terms

FOB*

Packaging

20 L pails, 200 L HDPE drums, 1000 L IBC

US Availability

US Facility Inventory

Documentation

US SDS · COA · TDS · Specification sheet

US Regulatory & Quality Information

TSCA status*

US SDS / HazCom*

GHS classification*

ISO 9001:2015 site*

DOT shipping classification*

FDA status*

EPA status*

California Prop 65*

Reliable US supply chain

Regulatory compliance

On-time delivery

Technical expert support

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