These sheets of IEC 60684-3 gives the requirements for four types of non-heatshrinkable sleeving, extruded from silicone elastomer. These sleevings are normally available with internal diameter up to 25 mm and in a range of 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 and pink. They are also available in a translucent form. Sizes or colours other than those specifically listed in this standard may be available as custom items. These items shall be considered to comply with this standard if they comply with the other property requirements listed in table 2.