San Jose Delta maintains an extensive in-house inventory of certified Materion beryllia ceramic machining stock, including BW-1000, a higher strength and finer grain berylia,. While the grinding of beryllium oxide requires stringent dust control during the grinding process (see health and safety below) it otherwise machines like other technical ceramics of the similar density and grain size. Intricate design features are no more or less difficult than other materials such as alumina or aluminum nitride-AlN and delivery times are similar as well.
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| Material Property | Qualified Value | Test Method |
|---|---|---|
| Thermal Conductivity | 0.7 to 0.9 cal/sec℃ cm. (At 38°C) | ASTM-C408-82 |
| Specific Heat | 0.25 cal/℃ gm. (25℃) | ASTM-C351-82 |
| Thermal Expansion | 9.0 x 106 in/in℃ (25℃ to 1000°C) | ASTM-C539-84 |
| Density | 2.85 gm/cc, min. | ASTM-C373-82 |
| Hardness | 60 on Rockwell 45N | ASTM-E1 8-84 |
| Impenetrability, Liquid | Impervious | ASTM-D1 16-81 |
| Impenetrability, Gas | Impervious | Helium Detecting Mass Spectrograph Set at 10-8 atm. cc/sec. |
| Average Grain Size | 20 microns | Linear Intercept with factor 1.27 |
| Flexural Strength | 35,000 psi | ASTM-D2442-85 |
| Tensile Strength | 20,000 psi | ASTM-D651 -84 |
| Compressive Strength | 225,000 psi | ASTM-C773-82 |
| Young's Modulus | 50,000,000 psi | ASTM-C623-81 |
| Shear Modulus | 25,000,000 psi | ASTM-C623-81 |
| Poisson's Ratio | 0.26 | ASTM-C623-81 |
| Dielecric Constant | 6.8 at 1 MHz 6.7 at 10 GHz | ASTM-D1 50-81 ASTM-D2520-81 |
| Dissipation Factor | .0003 at 2 MHz .0004 at 10 GHz | ASTM-D1 50-81 ASTM-D2520-81 |
| Resistivity | 1015 ohm-cm | ASTM-D257-93 |
| Dielectric Strength | 300 volts/mil (.125" thick) | ASTM-D1 49-81 |
| Color | White | Visual |
| Impact Resistance | 6in.-lbs. | ASTM-D256-R83 |
| Maximum Continuous Use Temperature | 1800°C | |
| Surface finish; As Fired: | 10-20 microinches | Dektak II |
| As Lapped: | 5 microinches, min. | Dektak II |
| As Ground: | To customer spec. | Dektak II |
| Metallic Impurity | Average PPM | Metallic Impurity | Average PPM |
|---|---|---|---|
| Ag | 1 | Li | 2 |
| Al | 100 | Mg | 1000 |
| B | 2 | Mn | 5 |
| Ca | 50 | Mo | 2 |
| Co | 1 | Na | 20 |
| Cr | 10 | Ni | 5 |
| Cu | 5 | Pb | 1 |
| Fe | 35 | Si | 1700 |
| K | 30 | Ti | 10 |
| Zn | 10 |
Health and Safety
Handling beryllium oxide ceramics in solid form poses no special health risk. Like many industrial materials, beryllium-containing materials may pose a health risk if recommended safe handling practices are not followed. Inhalation of airborne beryllium may cause a serious lung disorder in susceptible individuals. The Occupational Safety and Health Administration (OSHA) has set mandatory limits on occupational respiratory exposures. Read and follow the guidance in the Material Safety Data Sheet (MSDS) before working with this material. For additional information on safe handling practices on beryllium oxide ceramics, contact San Jose Delta at 408-727-1448.