六氟化硫具有良好的电气绝缘性能及优异的灭弧性能。其耐电强度为同一压力下氮气的2.5倍，击穿电压是空气的2.5倍，灭弧能力是空气的100倍，是一种优于空气和油之间的新一代超高压绝缘介质材料。
Sulfur hexafluoride has good electrical insulation performance and excellent arc extinguishing performance. Its electrical strength is 2.5 times of that of nitrogen under the same pressure, breakdown voltage is 2.5 times of that of air, and arc extinguishing capacity is 100 times of that of air. It is a new generation of ultra-high voltage insulating material superior to that between air and oil.