... high density heating elements 2,it can be OEM 3,material:99%,99.4%,99.5%,99.7,99.9%MgO ... used for high density heating elements2,it can be OEM3,material:99%,99.4%,99.5%,99.7,99.9%MgO ... :it mainly used in hot runner heaters and heating cables,the usage temperature can be 1600degreesC cartridge heater insulated material