1,approved by SGS used 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 4,best quality&best price5the Mininum OD:0.2mm6,appearance:with white color,smooth and vertical7, with High withstanding pressure,best insulating ...