Product Overview
Sulfur hexafluoride CAS 2551-62-4 (SF₆) is a synthetic, inorganic, colorless, odorless, non-toxic, and non-flammable gas. It is renowned as the world's most potent dielectric gas and a highly effective insulating medium. Due to its exceptional electrical insulation properties, thermal stability, and arc-quenching capabilities, sulfur hexafluoride has become indispensable in high-voltage electrical power transmission and distribution equipment. Its unique combination of chemical inertness and high density also enables diverse applications in other industrial sectors.
Basic Information
| CAS No. | 2551-62-4 |
| UN No. | UN1080 (Sulfur hexafluoride) |
| Molecular Formula | SF₆ |
Key Attributes & Parameters
| Purity | Available in standard industrial grade (typically ≥99.8%) and high-purity grades (≥99.99% or 4.5N) for electrical and electronic applications. |
| Density | Approximately 6.17 kg/m³ at 0°C and 1 atm (about 5 times denser than air). |
| Dielectric Strength | Excellent; roughly 2.5 times that of air at the same pressure, making it a superior insulating medium. |
| Key Properties | Chemically inert, thermally stable (up to ~500°C under normal conditions), excellent arc-quenching ability, and non-flammable. |
Features & Advantages
Superior Dielectric & Insulating Properties
Its high dielectric strength allows for more compact and efficient design of high-voltage equipment compared to using air or oil insulation.
Excellent Arc-Quenching Capability
Effectively extinguishes electrical arcs, which is critical for protecting circuit breakers and switchgear from damage.
Chemical Inertness & Stability
Non-reactive with most materials under normal operating conditions, ensuring long-term stability and reliability within sealed equipment.
Non-Flammable & Non-Toxic
Provides a significant safety advantage in electrical applications, though proper handling guidelines must be followed as it can displace oxygen in confined spaces.
Functional Characteristics
Sulfur hexafluoride CAS 2551-62-4 is primarily used as an electrical insulator and arc-quenching medium. In gas-insulated switchgear (GIS) and circuit breakers, it prevents electrical discharge between live components and between live components and ground. When an electric arc forms, sulfur hexafluoride rapidly decomposes under the high temperature of the arc, generating substances that effectively capture free electrons, thus quickly extinguishing the arc and preventing it from reigniting. Subsequently, these decomposition products recombine to regenerate sulfur hexafluoride, giving it a certain degree of self-healing capability. Sulfur hexafluoride is typically stored in cylinders as a compressed liquefied gas.
Primary Application Fields
Electrical Power Industry
The primary application is as an insulating and arc-quenching medium in high and medium-voltage gas-insulated switchgear (GIS), circuit breakers, transformers, and gas-insulated transmission lines (GIL).
Metal Processing
Used as a cover or shielding gas in magnesium melt protection to prevent violent oxidation during casting and processing.
Semiconductor Manufacturing
Utilized as an etching and chamber cleaning gas in plasma etching processes for silicon and other materials.
Medical & Scientific
Employed as a contrast agent in ultrasound imaging and as a tracer gas for atmospheric studies and leak detection due to its inertness and detectability.
Acoustic Insulation
Its high density makes it useful in some specialized soundproofing applications.
Customer Collaboration Case
We partnered with a major national utility company undertaking a massive grid modernization project in a dense urban area. They required a reliable, high-volume supply of ultra-high-purity sulfur hexafluoride for hundreds of new GIS substations. The challenge was ensuring consistent gas quality (critical for long-term equipment reliability) and managing logistics for just-in-time delivery to multiple construction sites. We implemented a dedicated supply chain with certified high-purity SF₆, batch-traceable quality documentation, and a coordinated delivery system using specialized transport. Our technical team also provided on-site support for gas handling and purity verification during equipment commissioning. The consistent performance of our sulfur hexafluoride contributed directly to the successful, space-efficient deployment of the new substations, enhancing grid reliability and safety in the metropolitan area.
Heze Dongjian Chemical Sales Co., Ltd. was established in January 2017 with a registered capital of 20 million yuan. It is a comprehensive chemical enterprise focusing on the sales and transportation of hazardous chemicals, integrating product supply and demand, quotations, and technical services. After years of deep development, the company's revenue has increased from the initial 1 million yuan to nearly 1 billion yuan, ranking among the leading players in the domestic hazardous chemicals sales sector. The company has over 340 dedicated hazardous chemical transportation vehicles and adopts a strategy of "multiple sources + mobile inventory + specialized transportation" to ensure smooth operations. It has established long-term partnerships with producers in Nanjing, Shandong, and Taixing, etc. With a tax credit A-level qualification in 2024 and a complete service system, the company has reached deep cooperation with several large factories, listed companies, and state-owned enterprises. Adhering to the philosophy of "customer first, honest operation", it continuously provides high-quality chemical products and comprehensive services to customers.
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