Beryllium oxide

CAS Number
1304-56-9
EC Number
215-133-1

What is Beryllium oxide?

Beryllium oxide (CAS 1304-56-9), also known as beryllia, is a high-performance ceramic material sourced for applications where exceptional thermal conductivity must be combined with electrical insulation.

Where is Beryllium oxide used?

  • Electronics: beryllia substrates and packages for high-power transistors and microwave devices
  • RF amplifiers: heat dissipation critical to component reliability
  • Aerospace and defense: radar systems and missile guidance components
  • Satellite electronics: dimensional stability under extreme thermal cycling
  • Nuclear applications: neutron moderator and reflector material in reactor design
  • Specialty laser and optical systems: thermal management directly affects output consistency
  • Thermalox is a recognized commercial grade used in precision industrial and defense components.

Commercial specifications

  • Standard grades include 99.0% and 99.5% purity powder
  • High-purity powder, sintered ceramic shapes, and machined components to meet specific engineering tolerances
  • Industrial buyers typically source to internal or customer-defined specifications

Other Names (Synonyms)

Beryllia|Thermalox|Beryllium monoxide|Natural bromellite|Thermalox 995|Beryllium oxide (BeO)

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What are the physical properties of Beryllium oxide?

Melting Point 2530 °C
Boiling Point ~3900 °C (approx)
Density 3.01 g/cm³
Flash Point 4300°C
Appearance solid
Color white
Form Powder
Water Solubility Insoluble in water. Slowly soluble in concentrated acids, alkali hydroxides
Refractive Index 1.733

How is Beryllium oxide classified and handled safely? Learn More

Danger
GHS06· Toxic GHS08· Health Hazard GHS07· Irritant

Hazard Statements

H301 Toxic if swallowed [Danger Acute toxicity, oral]
H315 Causes skin irritation [Warning Skin corrosion/irritation]
H317 May cause an allergic skin reaction [Warning Sensitization, Skin]
H319 Causes serious eye irritation [Warning Serious eye damage/eye irritation]

Which trade and regulatory codes apply to Beryllium oxide?

UN Number 1566
ADR Class 6.1
Packing Group II
WGK (Germany) 1
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