Beryllium oxide

Beryllium Oxide (CAS 1304-56-9), also known commercially as Beryllia or Thermalox 995, is an inorganic compound of beryllium and oxygen. It carries no E-code designation and is classified under salts and minerals. It is distinct from other beryllium compounds in its combination of electrical insulation and thermal conductivity.

In electronics, Beryllium Oxide is used as a substrate and heat spreader in high-power semiconductors and microwave devices, where it conducts heat away from components while maintaining electrical isolation. In aerospace and defense, it serves as a structural ceramic in radar systems and missile guidance components, where its stiffness-to-weight ratio and thermal stability under extreme conditions are operationally critical.

Beryllium Oxide is subject to strict REACH regulations due to its classification as a carcinogen, and handling requires compliance with occupational exposure limits across EU member states. It is available in powder form, with grades such as Thermalox 995 specifying high purity levels. Procurement requires documented end-use justification in most jurisdictions.