Overview
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.
Thermalox is a recognized commercial grade used in precision industrial and defense components. In electronics, beryllia substrates and packages are used for high-power transistors and microwave devices.
RF amplifiers utilize this material where heat dissipation is critical to component reliability. Aerospace and defense manufacturers specify these ceramics for radar systems and missile guidance components.
Satellite electronics demand dimensional stability under extreme thermal cycling, making this material essential. Nuclear applications utilize beryllia as a neutron moderator and reflector material in reactor design.
Specialty laser and optical systems also incorporate these components where thermal management directly affects output consistency. This ensures equipment longevity in demanding industrial environments.
The material is supplied as high-purity powder, sintered ceramic shapes, and machined components to meet specific engineering tolerances. Standard grades include 99.0% and 99.5% purity powder.
These powders are used for ceramic processing, as well as finished substrate forms for electronics manufacturing. Industrial buyers typically source to internal or customer-defined specifications.
Given the tightly controlled performance requirements of end applications, quality control is paramount. This ensures the material meets the rigorous standards required for high-tech manufacturing sectors.
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Physical Properties
| 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 |
Safety & Handling
Danger GHS06 GHS08 GHS07 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] H330 Fatal if inhaled [Danger Acute toxicity, inhalation] H335 May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation] H305 May be harmful if swallowed and enters airways [Warning Aspiration hazard] H350 May cause cancer [Danger Carcinogenicity] H361 Suspected of damaging fertility or the unborn child [Warning Reproductive toxicity] H370 Causes damage to organs [Danger Specific target organ toxicity, single exposure] H372 Causes damage to organs through prolonged or repeated exposure [Danger Specific target organ toxicity, repeated exposure] H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled [Danger Sensitization, respiratory]
Trade & Regulatory
| UN Number | 1566 |
| ADR Class | 6.1 |
| Packing Group | II |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 1304-56-9
- EC Number
- 215-133-1
- Mol. Weight
- 25.012
- Category
- Salts & Minerals