Sulfur Hexafluoride (SF₆): High-Performance Dielectric Gas for Critical Applications
Sulfur hexafluoride (SF₆), a colorless, odorless, and non-flammable inorganic gas (molecular weight: 146.055), is renowned for its exceptional dielectric strength and thermal stability. With a density of 6.0886 kg/m³ at 20°C (5x denser than air) and octahedral molecular geometry, SF₆ exhibits unmatched chemical inertness below 180°C, ensuring compatibility with electrical materials.
Core Applications
- High-Voltage Insulation:
SF₆ is the preferred dielectric medium for gas-insulated switchgear (GIS), reducing substation footprint by 90% versus air-insulated systems. Widely adopted in ultra-high-voltage (UHV) grids and urban distribution networks (e.g., ring main units).
- Transmission Efficiency:
SF₆-insulated bus ducts enable low-loss power transmission with 3x higher capacity than oil-filled cables, ideal for hydropower plant exits and high-altitude installations.
- Fire-Safe Transformers:
SF₆-filled transformers eliminate explosion risks, serving densely populated areas and high-rise buildings. Emerging 500kV+ gas-insulated transformers redefine substation design.
Available in ISO-certified cylinders or bulk gas supply.
Product Specifications
- CAS Number: 2551-62-4
- UN Number: 1080
- EINECS Number: 219-854-2
- Molecular Weight: 146.05
- Appearance: Colorless, odorless
- Melting Point: -50.8°C
- Boiling Point: -63.8 °C
- Density: 6.0886 kg/m³
- DOT Class: 2.2
- Label: Unflammable Gas
| Industrial grade SF6 | Electronic Grade SF6 | |
| Specification | 99.995% | 99.999% |
| Air | ≤ 10 ppm | / |
| CF4 | ≤ 2 ppm | ≤ 0.5 ppm |
| C2F6 | ≤ 20 ppm | / |
| C3F8 | ≤ 5 ppm | / |
| Low sulfur compounds | Not Detected | / |
| H2O | ≤ 1 ppm | ≤ 3 ppm |
| HF | ≤ 0.1 ppm | ≤ 0.1 ppm |
| Hydrolyzed fluorides | ≤ 0.3 ppm | ≤ 0.8 ppm |
| Mineral oil | ≤ 1 ppm | / |
| O2+Ar | / | ≤ 1 ppm |
| N2 | / | ≤ 2 ppm |
| CH4 | / | ≤ 0.1 ppm |
| CO | / | ≤ 0.5 ppm |
| CO2 | / | ≤ 0.5 ppm |
Packaging Specifications：
| Cylinder Specifications | Content | |
| Cylinder Capacity | valve | weight |
| 40L | CGA 590/QF-2 | 50 kg |
| 47L | CGA 590/QF-2 | 58 kg |
| 50L | CGA 590/QF-2 | 62 kg |
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.
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