Reviews all significant aspects of the recycling of SF6 gas used in electrical power equipment. Recommendations for the design of equipment using SF6 to allow ease of gas recycling and appropriate gas handling and recycling procedures - essential features of handling and recycling equipment. Identifies origins - quantities and deteriorating effects of contaminants to be expected in SF6 used in electrical power equipment and proposes purity standartds to which SF6 gas should be reclaimed to allow its safe re-use.