In addition to the impurities generated during the synthesis process of SF6 gas, a small amount of air, moisture, mineral oil and other impurities may also be mixed in the gas filling process. These impurities all carry or produce certain toxic substances. Therefore, in order to ensure the purity and quality, quality standards have been formulated for the sulfur hexafluoride that leaves the factory, and the manufacturer is required to provide a biological test non-toxic certificate when supplying it.
1. Some toxic products produced by SF6 gas in electrical equipment when the high-temperature arc acts.
For example: the decomposition of SF6 gas in the arc and the reaction with oxygen: it will produce toxic substances such as fluorinated thionyl, tetrafluoride, and fluorinated sulfur.
2. The sulfur hexafluoride gas decomposition product in electrical equipment reacts with the moisture inside to produce certain toxic products. For example: the secondary reaction of SF6 gas decomposition products and water produces hydrofluoric acid, sulfur dioxide, sulfuric acid, etc.
3. SF6 gas and decomposition products in electrical equipment react with electricity (Cu-W alloy) and metal materials (AL, Cu) to generate certain toxic products. For example: Sulfur hexafluoride gas and decomposition products react with electricity or other materials: ALF3 (solid powder) ALF3 (solid powder) CuF2 (solid powder) and other solid powders
4. SF6 gas and decomposition products in electrical equipment react with peripheral materials to generate certain toxic products. For example, it has a chemical effect with epoxy phenolic glass cloth boards (rods, tubes) and other edge parts containing silicon; or epoxy resin castings, molded parts, porcelain bottles, silicone rubber, silicone grease, etc. with quartz sand and glass as fillers , Generate SiF4, Si(CH3)2F2 and other products.
The high temperature decomposition products of the above sulfur hexafluoride gas will cause the problem of impure sulfur hexafluoride gas purity. We must avoid it when we buy, find a regular manufacturer to buy, and attach the product test report.
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