SF6 Gas is often used as a dielectric and arc-suppression medium in gas insulated equipment (GIE). Most manufacturers of GIE’s recommend maximum and minimum tolerances for certain variables within the gas, including moisture, gas decomposition, and purity of SF6. Exceeding the GIE recommended moisture levels will cause formation of acidic by-products, such as HF, SO2, SOF2, etc. Therefore, it is ...