Material	Beryllium oxide - Beryllia
	Beryllia (BeO) combines extremely high thermal conductivity, particularly at temperatures below 300°C, excellent dielectric properties, corrosion resistance, and moderate mechanical strength. BeO is one of the most expensive raw materials used in ceramics. This, plus its pulmonary toxicity if inhaled, tends to limit its use to those applications where its extraordinary properties are mandatory. Major markets for beryllium oxide ceramics include several nuclear applications within a reactor, microwave tube parts, electronic substrates, discharge tubes for gas lasers, and metallurgical applications for melting rare earths.
Danish Name	Berylliumoxid
Category	Ceramics, Oxide ceramics
Processes	Powder technology
References	Johnson Matthey GmbH
Price	It is one of the most expensive ceramic materials commercially available.
Environmen- tal notes	Poisonous substance: if inhaled it is highly toxic and causes pulmonary problems.
Additional Info	Colour: white; Max. use temperature: 1900°C; E-modulus: 345 GPa; Thermal conductivity: (@ 20°C) 250 W/mK; (@ 500°C) 55 W/mK.
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