This sheet of IEC 60684-3 gives the requirements for non-heat-shrinkable sleeving, extruded from compounds based on fluorosilicone rubber. Sleeving of this type is normally available with internal diameters up to 25 mm, and in a range of different wall thicknesses between 0.1 mm and 2.0 mm. National standards may select a restricted list of preferred combinations of internal diameter and wall thickness. These sleevings are normally available in the following opaque colours: black, brown, red, orange, yellow, green, blue, violet, grey, white, pink and green/yellow. They are also availabe in colourless translucent/transparent form.