Gives the requirements for glass textile fibre sleeving, uncoated, constructed from a braid of E-type yarn. The sleeving is annealed by heat treatment to assist in maintaining a circular cross-section. This sleeving is suitable for use at temperatures up to 350 °C. It is normally available in internal diameters between 0,5 mm and 30 mm and is normally supplied in its natural colour. 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.