Is sulfur hexafluoride gas toxic?Pure sulfur hexafluoride is an inert gas,under the action of electric arc will decompose,when the temperature is above 4000K,most of the decomposition of sulfur and fluorine single atoms.After the arc is extinguished,most of the decomposition products recombine into stable sulfur hexafluoride molecules.A very small amount of the decomposition,in the process of recombination with free metal atoms,water and oxygen chemical reaction,to produce metal fluoride and oxygen,sulfur fluoride.Sulfur hexafluoride,when used in electrical equipment,may decompose to produce oxygen,sulfur fluoride and metallic fluoride powders,either under fault conditions or under normal breaking ARCs.

　　In experiments,it has been shown that workers in the environment containing even a very small amount of sulfur hexafluoride gas decomposition,will also feel a pungent or uncomfortable smell,nose,mouth and eyes have obvious irritation.This reaction can occur within seconds before a toxic reaction is apparent.

　　Let's take a look at the breakdown of sulfur hexafluoride gases in electrical equipment.

　　According to the experimental observation,some electrical equipment in the sulfur hexafluoride gas in the high temperature arc when the action of some toxic products.Gases and decomposing materials react with electrodes(Cu-W alloy)and metal materials(AL,Cu)to form some toxic products.

　　Other electrical equipment in the sulfur hexafluoride gas decomposition and water in the chemical reaction to produce some toxic products.

　　Some electrical equipment in the high purity sulfur hexafluoride and decomposition of the reaction with insulation materials to produce some toxic products.Such as with the silicon component of epoxy phenolic glass filament cloth board(rod,tube)and other insulating parts.