Magnesium oxide is used as a laboratory reagent and an insulator in industrial cables. It acts as a reference material for calorimetry. It is widely used as a basic refractory material for crucibles, a protective coating in plasma displays, an oxide barrier in spin-tunneling devices, an optical material, a component of tubular construction in heating elements, and also in libraries for preserving books. Magnesium oxide microspheres used in enrichment method of polycyclic aromatic hydrocarbons.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.