Popular Gases

Sulfur Dioxide

Sulfur Dioxide (SO₂)

High-Purity Industrial Gas for Critical Applications

Sulfur dioxide (SO₂), a colorless gas with a pungent odor and high water solubility, is a versatile inorganic compound widely used in chemical manufacturing, pulp and paper processing, and as a food desiccant and preservative. It is also commonly used in sulfuric acid production and in the desulfurization of natural gas and oil. With a boiling point of -10°C, it serves as both a reactive intermediate and a functional additive, though its environmental impact as a primary air pollutant requires stringent handling. Our SO₂ is supplied in ISO-certified cylinders.

Specifications

CAS No. 7446-9-5
UN No. 1079
EINECS No. 231-195-2
Molecular Weight 64.07
Appearance Colorless, with pungent odor
Melting Point -75.5 °C
Boiling Point -10 °C
Density 2.9275 kg/m³
DOT Class 2.3 & 8
Labeltoxic gas, corrosive
High purity sulfur dioxide
Specification99.99%
Residue≤ 0.01 %
H2O≤ 0.01 %
As≤ 0.000004 %



Packaging Specifications

Gas Container >>
Cylinder SpecificationsContent
Cylinder Capacity valveweight
40LQF-1045 kg
400LQF-10500 kg
800LQF-101000 kg


Key Applications

Pulp Paper

Sulfur dioxide (SO₂) is used in papermaking and bleaching processes for impurity removal, bleaching, and pH control. YIGAS provides high-purity SO₂ to ensure efficient, safe, and environmentally friendly processes.

Air Emissions Monitoring

Air emission monitoring is crucial for environmental protection and compliance. YIGAS provides high-purity calibration gases, mixed gases, and standard gases, widely used in flue gas monitoring, industrial emission testing, and environmental laboratory analysis. Our products cover sulfur dioxide, carbon dioxide, methane, nitrogen, and oxygen, ensuring accurate and stable monitoring results for our clients.

Safety & Compliance

Exposure Limits

OSHA PEL: 5 ppm (8-hr TWA); NIOSH IDLH: 100 ppm.

EU food labeling: Mandatory "contains sulfites" declaration above 10 ppm.

FAQ

Why Choose YIGAS?

Team

Global Leadership: Management team with multinational and listed company backgrounds, backed by decades of expertise in the industrial gases sector.

End-to-End Expertise: Integrated capabilities spanning production, operation, R&D, commercialization, and quality assurance in gas industry.

Technical Excellence: Advanced knowledge in gas/chemical synthesis, purification, and process optimization, supported by on-demand technical application services.

R & D

Innovation-Driven: Focus on cutting-edge R&D to deliver safer, sustainable, and cost-effective gas solutions.

Full-Cycle Development: From concept design to scalable production, ensuring seamless technology transfer and market readiness.

Service

Customer-Centric Solutions: Tailored services with flexibility, professionalism, and 24/7 dedicated support.

Value Proposition: Guaranteed supply chain stability, safety compliance (ISO/OSHA standards), and total cost optimization.

Quality

Zero-Compromise Standards: Rigorous QC protocols for both in-house and outsourced products, validated by third-party certifications.

Operational Precision: Expertise in lean production management, analytical quality control, and continuous process improvement.

We Look Forward To Working With You.