... heater 2, gas-oven 3 ,boiler 4,BBQ spark electrodes,flame sensors,spark plug Material For Choice: Ceramic Insulator Body: 95 ... % Alumina, Steatite with glazed or no glazed layer Electrode Pin/Rod: OCR25, OCR27, SUS304, Ni80Cr20, Kanthal D, etc. Bracket: Steel ...