Sulfur Dioxide (SO2)
Specifications
- Chemical Formula: SO2
- CAS No.: 7446-09-5
- UN No.: 1079
- EINECS No.: 231-195-2
- Molecular Weight: 64.07 g/mol
- Appearance: colorless, pungent odor
- Melting Point: -75.5 ℃
- Boiling Point: -10 ℃
- Density: 2.9275kg/m³
- Hazard Class (DOT): 2.3 & 8
- Label: Toxic gas, corrosive gas
High-purity sulfur dioxide (SO₂) gas supplied from China for chemical synthesis and industrial processing.
High-purity sulfur dioxide (SO₂) gas for sulfuric acid production, water treatment, food preservation, and paper bleaching.
Sulfur dioxide is a colorless gas with a strong, irritating, pungent odor. As the most common sulfur oxide, it is highly soluble in water, ethyl alcohol, and ether. When dissolved in water, it forms sulfurous acid (H₂SO₃), which can be further oxidized to produce sulfuric acid efficiently. Sulfur dioxide serves as a key intermediate in sulfuric acid production, a reducing agent in water treatment, a preservative in food processing, and a bleaching agent in the paper and textile industries. It is also widely used in chemical synthesis for producing sulfites and other sulfur-containing compounds, typically transported as a liquefied compressed gas.
Global Shipping & Export Compliance
Sulfur dioxide (UN 1079) is classified as a toxic compressed gas and must be handled under strict hazardous materials regulations.
- Sea freight (FCL / LCL) – standard export method
- Air freight – limited availability (regulatory controlled)
Required Export Documents
- Material Safety Data Sheet (MSDS)
- Certificate of Analysis (COA)
- Dangerous Goods Declaration (DGD)
- UN-certified cylinder documentation
- Commercial invoice & packing list
How to Order Sulfur Dioxide Gas from China
- Send technical requirements (purity, pressure, application)
- Receive quotation (EXW / FOB / CIF options)
- Confirm cylinder specification & compliance
- Review COA, MSDS, and certification documents
- Production, filling, and quality inspection
- Hazardous goods shipping arrangement
- Delivery and final inspection at destination
Common Mistakes When Buying Sulfur Dioxide Gas
- Choosing suppliers only based on lowest price
- Ignoring cylinder certification and pressure rating
- Not verifying moisture and impurity levels
- Skipping third-party inspection before shipment
- Overlooking export documentation compliance
Packaging
| Gas Cylinder Specifications | Contents | |
| Cylinder Capacity | Cylinder Valve | Weight |
| 40L | QF-10 | 50kg |
| 800L | QF-10 | 1000kg |
Industrial Grade Sulfur Dioxide (SO2) 99.9%
| Purity | 99.9% |
| Residue | ≤ 0.04% |
| Moisture | ≤ 0.06% |
| Arsenic | ≤ 0.000004% |
Electronic Grade Sulfur Dioxide (SO2) 99.999%
| Purity | 99.999% |
| Hydrogen (H2) | ≤ 0.5ppm |
| Oxygen (O2) ＋Argon Gas (Ar) | ≤ 1ppm |
| Nitrogen (N2) | ≤ 4ppm |
| Methane (CH4) | ≤ 0.5ppm |
| Carbon Monoxide (CO) | ≤ 0.5ppm |
| Carbon Dioxide (CO2) | ≤ 1ppm |
| Carbonyl Sulfide (COS) | ≤ 1ppm |
| Carbon Disulfide (CS2) | ≤ 1ppm |
| Hydrogen Sulfide (H2S) | ≤ 0.5ppm |
| Ethylene (C2H4) | ≤ 0.5ppm |
| Propane (CH3CH2CH3) | ≤ 0.5ppm |
| N-Butane (C4H10) | ≤ 0.5ppm |
| Iso-Butane (C4H10) | ≤ 0.5ppm |
| Moisture | ≤ 2ppm |
| Total Impurities | ≤ 10ppm |
Frequently Asked Questions
