... 1.Made of magnesium oxide 2.Used for metal casting or ceramic sample preparation, etc. Magnesium oxide ceramic crucible ... used in chemical industry, animal husbandry, papermaking, production of pharmaceuticals, rubber making, and building material industry etc ... .(3) Application:Fireproof material, refractory, magnesium oxide bricks, MgO board, abrasive, fertilizer, water retention ...