magnesium oxide

1.Used as one of the raw materials for making cement in dry process plants; specifically Portland cement. If too much is added, the cement may be expansive.
2.Used as an insulator in .

3. Used as a principal ingredient in construction materials used for fireproofing.
   4.Used as an insulator in devices that exhibit the effect.
   An industrial use of magnesium oxide is in leather processing, as a basifying agent on chrome tanning process