Sulfur Hexafluoride (SF 6 )
Sulfur hexafluoride is a colorless, odorless, non-toxic, non-flammable stable gas. It is one of the most chemically inert gases known, remaining stable at temperdatures up to approximately 400°F (204°C) in the presence of most materials. As a typically non-polar gas, it is slightly soluble in water and oil but highly soluble in non-polar organic solvents. When distilled water is saturated with Sulfur hexafluoride, the pH remains unchanged. It serves as a new generation of ultra-high voltage insulating dielectric material. High-purity electronic grade Sulfur hexafluoride is an ideal electronic etchant, typically transported as a liquefied compressed gas.
- CAS No.: 2551-62-4
- UN No.: 1080
- EINECS No.: 219-854-2
- Molecular Weight: 146.05 g/mol
- Appearance: Colorless, odorless
- Melting Point: -50.8 ℃
- Boiling Point: -63.8 ℃
- Density: 6.0886kg/m³
- Hazard Class (DOT): 2.2
- Label: Non-flammable gas
Insulating Medium
SF6 is used in the electrical industry as a gaseous dielectric medium for high-voltage circuit breakers, switchgear, and other electrical equipment, often replacing oil-filled circuit breakers (OCBs) which may contain harmful PCBs.
Medical Applications
In retinal detachment repair surgery, SF6 is used in the form of bubbles to tamponade or block retinal holes.
| Gas Cylinder Specifications | Contents | |
| Cylinder Capacity | Cylinder Valve | Weight |
| 40L | CGA 590 / QF-2 | 50kg |
| 47L | CGA 590 / QF-2 | 58kg |
| 50L | CGA 590 / QF-2 | 62kg |
| 500L | CGA 590 / QF-2 | 625kg |
| Purity | ≥ 99.995% |
| Air | ≤ 10ppm |
| Carbon Tetrafluoride (CF4) | ≤ 2ppm |
| Hexafluoroethane (C2F6) | ≤ 20ppm |
| Octafluoropropane (C3F8) | ≤ 5ppm |
| Low Sulfide | Not Detected |
| Moisture | ≤ 1ppm |
| Acidity as HF | ≤ 0.1ppm |
| Hydrolysable Fluoride as HF | ≤ 0.3ppm |
| Mineral Oil | ≤ 1ppm |
| Purity | ≥ 99.999% |
| Oxygen (O2) Argon Gas (Ar) | ≤ 1ppm |
| Nitrogen (N2) | ≤ 2ppm |
| Methane (CH4) | ≤ 0.1ppm |
| Carbon Monoxide | ≤ 0.5ppm |
| Carbon Tetrafluoride (CF4) | ≤ 0.5ppm |
| Carbon Dioxide (CO2) | ≤ 0.5ppm |
| Moisture | ≤ 3ppm |
| Hydrogen Fluoride (HF) | ≤ 0.1ppm |
| Hydrolysable Fluoride as HF | ≤ 0.8ppm |
