This part of IEC 60684 gives the requirements for four types of heat-shrinkable, flame retarded, fluid resistant, elastomer sleevings, nominal shrink ratio of 2:1.Type A: standard wall thickness for use at temperatures up to 120 °CType B: thin wall thickness for use at temperatures up to 120 °CType C: standard wall thickness for use at temperatures up to 150 °CType D: thin wall thickness for use at temperatures up to 150 °CThese sleevings are normally supplied with internal diameters up to 102 mm for the standard wall thickness and up to 51 mm for the thin wall thickness. The standard colour is black. Sizes or colours other than those specifically listed in