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Send EmailSodium Bisulfite, 7631-90-5
| Property | Detail |
|---|---|
| Chemical Name | Sodium Bisulfite |
| English Name | Sodium Bisulfite |
| Chemical Formula | NaHSO₃ |
| CAS No | 7631-90-5 |
| EC No | 231-548-0 |
| Molecular Weight | 104.06 g/mol |
| Appearance | Colorless to light yellow liquid |
| Odor | Characteristic SO₂ odor |
| Grade | Technical / Industrial |
Sodium bisulfite is a water-soluble inorganic salt used for reduction, deoxygenation, chlorine neutralization and preservative purposes.
| Property | Value |
|---|---|
| Appearance | Colorless to light yellow liquid |
| Odor | Characteristic SO₂ odor |
| Chemical Formula | NaHSO₃ |
| Molecular Weight | 104.06 g/mol |
| Density (20°C) | 1.30 – 1.40 g/cm³ |
| pH (10% solution) | 4.0 – 5.5 |
| Solubility | Completely soluble in water |
| Active Matter (NaHSO₃) | 38 – 40% |
| Iron (Fe) | Max. 20 ppm |
Note: Values are typical values and may vary depending on the production specification.
| Parameter | Specification |
|---|---|
| NaHSO₃ Content | 38 – 40% |
| Density (20°C) | 1.30 – 1.40 g/cm³ |
| pH (10% solution) | 4.0 – 5.5 |
| Iron (Fe) | ≤ 20 ppm |
| Appearance | Clear, yellowish liquid |
| Water Solubility | Completely soluble |
| Property | Value |
|---|---|
| Physical State | Liquid |
| Color | Colorless to light yellow |
| Odor | Characteristic SO₂ odor |
| Density (20°C) | 1.30 – 1.40 g/cm³ |
| Solubility | Completely soluble in water |
| Clarity | Clear |
| Sector | Use |
|---|---|
| Water Treatment | Free chlorine removal, membrane protection in reverse osmosis systems, deoxygenation applications |
| Paper Industry | Chlorine removal after pulp bleaching, reducing agent |
| Textile Industry | Reduction processes after dyeing, bleaching processes |
| Food Industry | Antioxidant and preservative applications (in appropriate quality grades) |
| Oil and Gas | Oxygen scavenger, corrosion control |
| Packaging Type | Net Weight |
|---|---|
| PE drum | 30 kg |
| IBC | 250 kg |
| Bulk tanker shipment | - |
Store in cool, dry and well-ventilated areas.
Keep away from strong oxidizing agents.
Do not expose to direct sunlight.
Keep in original packaging.
Recommended storage temperature: 5°C – 30°C
Under suitable conditions, recommended shelf life: 12 months
SO₂ gas may be released upon contact with acids.
Protective goggles, gloves and appropriate occupational safety equipment should be used.
For detailed safety information, the SDS (Safety Data Sheet) must be reviewed.
Avoid eye and skin contact.
May irritate the respiratory tract; ensure good ventilation.
| Exposure | Measure |
|---|---|
| Inhalation | Move to fresh air; seek medical attention if breathing is difficult |
| Skin Contact | Wash with plenty of water and soap |
| Eye Contact | Rinse with plenty of water for at least 15 minutes; seek medical attention |
| Ingestion | Rinse mouth, drink plenty of water; seek medical attention |
| Property | Value |
|---|---|
| Flammability | Not flammable |
| Suitable Extinguishing Media | Water spray, foam, dry chemical, CO₂ |
| Specific Hazards | Toxic SO₂ gas is released upon contact with acids |
| Protective Equipment | Self-contained breathing apparatus and full protective clothing should be used |
Wear personal protective equipment.
Collect spilled liquid with inert absorbent material.
Prevent entry into drains and water sources.
Dispose of in accordance with waste disposal legislation.
Do not allow contact with acids.
| Property | Value |
|---|---|
| Stability | Stable under normal storage conditions; may decompose with heat and light |
| Hazardous Decomposition Products | SO₂ gas, sodium sulfate |
| Polymerization | Does not polymerize |
| Reducing Properties | Strong reducing agent |
Strong oxidizing agents
Acids (releases SO₂ gas)
Moisture
Direct sunlight
| Information | Value |
|---|---|
| Transport Class | Dangerous goods (corrosive / toxic) |
| UN Number | UN 2693 (Sodium Bisulphite, aqueous solution) |
| Packing Group | III |
| Transport Conditions | Transport in closed, clean vehicles; keep separate from acids; protect from direct sunlight |
| Subject | Statement |
|---|---|
| Intended Use | Industrial use (water treatment, paper, textile, oil and gas) |
| Food Contact | Compliance with relevant legislation for food grade quality is declared upon customer request |
| REACH | The product should be evaluated under the REACH regulation; consult the SDS for exact information |
| Labeling | C (Corrosive), Xn (Harmful) hazard symbols; R22, R31, R34 risk phrases |
| Parameter | Specification | Method |
|---|---|---|
| NaHSO₃ | 38 – 40% | Titrimetric (iodometry) |
| Density (20°C) | 1.30 – 1.40 g/cm³ | Pycnometer / Densitometer |
| pH | 4.0 – 5.5 | Potentiometric |
| Fe | ≤ 20 ppm | ICP-OES / AAS |
| Appearance | Clear, yellowish liquid | Visual |
A Certificate of Analysis (CoA) is issued for each batch.
Traceability is ensured by batch number.
Production and quality control activities are carried out in accordance with relevant quality management system principles.
Question 1: What is sodium bisulfite used for?
Answer: It is used as a reducing agent, oxygen scavenger and chlorine removal agent in water treatment, paper and textile industries, food preservation and oil/gas applications.
Question 2: What happens when it comes into contact with acids?
Answer: Upon contact with acids, toxic SO₂ (sulfur dioxide) gas is released; therefore, it must be kept away from acids.
Question 3: What is the shelf life?
Answer: Under suitable storage conditions, the shelf life is 6 months.
Question 4: In what packaging is it supplied?
Answer: It is supplied in 30 kg PE drums, 250 kg IBCs and bulk tanker shipments.
The information in this Technical Data Sheet is prepared to describe the typical properties of the product. The buyer is responsible for verifying the suitability of the product for its specific intended use and compliance with applicable legislation. Specifications may be updated without prior notice. Please contact the manufacturer/supplier for the current revision. Safety Data Sheet (SDS) is available upon request.