1,approved by SGS used for high density heating elements 2,it can be OEM 3,material:99%,99. ... powder MgO tube1,approved by SGS used for high density heating elements2,it can be OEM3,material:99%,99.4%,99 ... 9,usage:it mainly used in hot runner heaters and heating cables,the usage temperature can be 1600degreesC mgo powder for ...