... Used for metal casting or ceramic sample preparation, etc. Magnesium oxide ceramic crucible (1) Material: MgO 90;MgO 96;MgO 99 ... 98%, 99%, 99.4%, 99.8(2) Product Description:Caustic calcined ... building material industry etc.(3) Application:Fireproof material, refractory, magnesium oxide bricks, MgO board, abrasive, fertilizer, water retention material, feed ...