Sonya Ceramics offers High Voltage Tube and Star Cores. Sonya Ceramics is an ISO 9001 accredited company. Sonya Ceramics also manufactures Ceramic items made from Porcelain, Steatite, Cordierite Refractory, Cordierite Tube and Thermo Couple Heads, Insulators, Alumina Refractory and High Alumina of different grades. The High Voltage Tube and Star Cores are used for High Rupting Capacity [HRC] Fuse of High voltage.