This part of IEC 60684 gives the requirements for two types of general purpose, flexible, flame retarded, heat-shrinkable polyolefin sleeving. This sleeving has been found suitable for use at temperatures up to 125 °C. - Type A - Highly flame retarded - Type B - Flame retarded The minimum supplied and maximum recovered internal diameters shall be specified by the manufacturer and shall meet the minimum wall thicknesses given in Table 2. It is normally available in bore sizes up to 75 mm as supplied and in the following colours: black, brown, white, red, yellow, green, blue, orange, violet, grey and yellow/green. Materials which conform to this specification meet established levels of performance. However, the selection of a material by a user for a specific application should be based on the actual requirements necessary for adequate performance in that application and not based on this specification alone.