Provides the requirements for four types of semi-rigid, heat-shrinkable polyolefin sleeving with a nominal shrink ratio of 2:1 that has been found suitable for temperatures up to 135 degrees C. - Type A: general purpose, flame-retarded, opaque colours; - Type B: general purpose, non flame-retarded, translucent; - Type C: fluid resistant, flame-retarded, opaque colours; - Type D: fluid resistant, non flame-retarded, translucent.