... for high density heating elements 2,it can be OEM 3,material:99%,99.4%,99.5%,99.7,99.9%MgO ... powder MgO tube1,approved by SGS used for high density heating elements2,it can be ... OEM3,material:99%,99.4%,99.5%,99.7,99.9%MgO powder ... heaters and heating cables,the usage temperature can be 1600degreesC mgo tube for cartridge heater