Noun
beryllium oxide (uncountable)
(inorganic chemistry) A white, crystalline compound, BeO, used in semiconductors and in specialist ceramic applications.
Beryllium oxide is frequently used as an insulator base plate in high-power transistors in radio frequency transmitters for telecommunications. Source: Internet
Beryllium oxide is useful for many applications that require the combined properties of an electrical insulator and an excellent heat conductor, with high strength and hardness, and a very high melting point. Source: Internet