SF - gas 6Heavy gas sulfur hexafluoride (SF ) was originally discovered in the 1930s. Despite its outstanding qualities as an gaseous electrical 6insulator, it had initially no practical use in engineering.It was only by the end of the 1950s, first in the USA and soon afterwards in Europe that this particular gas was more extensivelyexplored, leading to its principle application as an extinguishing and electrical insulating medium.Commonly used in power applications, SF is used in high-voltage circuit breakers, metal-enclosed switchgear, linear accelerators, 6high-voltage transformers, capacitors and gas insulated lines world wide.