| Cylinder Specifications | Cylinder Dimensions (cm) | Average Gross Weight (kg) | Valve/Thread Outlet QF-2/Thread G5/8 or | Filling Weight (kg) |
| 40L | 22*140 | 100 | CGA590 | 50 |
| 43LDOT | 23*140 | 1 | CGA590 | 45.4 |
| Component | Sulfur Hexafluoride | Sulfur Hexafluoride | Unit | |
| Sulfur Hexafluoride | ≥ | 99.99% | 99.999% | %V |
| Air | ≤ | 30 | 5 | ppmv |
| Carbon Tetrafluoride | ≤ | 30 | 4 | ppmv |
| Moisture | ≤ | 1 | 1 | ppmv |
| Acidity (as HF) | ≤ | 0.1 | 0.1 | ppmv |
| Hydrolyzable Fluorides* (as HF) | ≤ | 0.2 | 0.1 | ppmv |
| Mineral Oil | ≤ | 0.5 | 0.5 | ppmv |
| Bioassay | ≤ | Non-toxic | Total carbon ≤0.5ppmv | ppmv |
Sulfur Hexafluorideis a colorless, odorless, non-flammable, non-reactive, relatively non-toxic, and only asphyxiating liquefied gas. It is packaged as a liquefied gas under its vapor pressure (202.78 kgf/cm2 @21.1°C). Sulfur hexafluoride is widely used in the electrical industry due to its excellent insulating and arc-extinguishing properties, such as in circuit breakers, high-voltage switches, high-voltage transformers, gas-insulated combined capacitors, high-voltage transmission lines, and instrument transformers. SF6 is also widely used in metal smelting (e.g., protective gas for magnesium alloy melting furnaces), aerospace, medical (X-ray machines, laser machines), meteorology (tracer analysis), and chemical industries (advanced automotive tires, new fire extinguishers) due to its chemical inertness, non-toxicity, non-flammability, and non-corrosiveness. Electronic-gradehigh-purity sulfur hexafluorideis an ideal electronic etchant, widely used in microelectronics technology. With the advancement of technology, the fields where SF6 is applied continue to expand, and it is widely used in more fundamental and technological fields. In the refrigeration industry, sulfur hexafluoride is used as a refrigerant, with a cooling range between -45°C and 0°C.
Sulfur hexafluoride circuit breakers are a type of circuit breaker that uses sulfur hexafluoride gas as the arc-extinguishing and insulating medium. The use of sulfur hexafluoride as an arc-extinguishing gas medium in circuit breakers began in the early 1950s. Due to the excellent characteristics of sulfur hexafluoride gas, SF6 circuit breakers have significantly higher voltage and current parameters per interrupter unit compared to compressed air circuit breakers and minimum oil circuit breakers, and do not require high gas pressure or a large number of series interrupters. In the 1960s-1970s, SF6 circuit breakers were widely used in extra-high voltage and high-capacity power systems. In the early 1980s, SF6 circuit breakers with 363 kV single interrupter, 550 kV double interrupter, and rated breaking currents of 80 and 100 kA were successfully developed.
Applications of Sulfur Hexafluoride
Used as arc-extinguishing gas in SF6 circuit breakers, mutual inductance sensors, and SF6 lightning arresters
Used as protective gas for magnesium-aluminum alloy die casting
Electronic-grade high-purity sulfur hexafluoride, as an ideal electronic etching gas, is widely used in microelectronics technology
Used as a dopant for the single-mode fiber isolation layer in optical fiber manufacturing
Used as a tracer in atmospheric pollution monitoring and hydrogeological detection
Also used as a contrast agent for ultrasound imaging of liver tumors
