2.2. Material properties
The insulator consists of three main parts:
(i) The dielectric, which is porcelain material with silicone coating;
(ii) The terminations, which are iron for the cap and steel for the pin; their role is to couple the dielectric to the mechanical structure.
(iii) The intermediaries like cement which are used to fix the metal fittings to the porcelain insulator [6.9].