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Beryllia ( BeO 99.5 )

Material Information

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Rod Sheet
Rod Sheet

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General Description:  

Beryllia has been produced commercially for over fifty years. It shows a high thermal conductivity, yet also has a high volume resistivity and used typically as an electronically insulating heat sink. Beryllia has a high dielectric strength and a low dielectric constant. It exhibits good thermal shock resistance and is chemically stable up to 2000C. This leads to use for crucibles and thermocouple tubes. It has a low density, high strength and high hardness and is transparent to microwaves. The processing of this highly toxic material has been controlled for 30 years, although it may be handled safely provided the correct procedures are followed.

   

Chemical Resistance

Acids - concentrated Poor
Acids - dilute Fair
Alkalis Fair
Halogens Fair
Metals Good

Electrical Properties

Dielectric constant 6.5-7.5
Dielectric strength ( kV mm-1 ) 10-14
Volume resistivity @25C ( Ohmcm ) >1014

Mechanical Properties

Compressive strength ( MPa ) 1550-1850
Hardness - Vickers ( kgf mm-2 ) 1100-1300
Shear strength ( MPa ) 180-250
Tensile modulus ( GPa ) 340-400

Physical Properties

Apparent porosity ( % ) 0
Density ( g cm-3 ) 2.86
Water absorption - saturation ( % ) 0.07

Thermal Properties

Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) 8.4-9.0
Specific heat @25C ( J K-1 kg-1 ) 1020-1120
Thermal conductivity @20C ( W m-1 K-1 ) 260-300
Upper continuous use temperature ( C ) 1800-1900
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.

Buy Beryllia on-line

We stock and supply the following standard forms:
Rod Sheet
Rod Sheet

Choose a form to search our on-line catalog  

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