| All data is for information only------(Home) | |
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| PRODUCT DATA of Beryllium |
| Material | Beryllium |
| Precautions | Beryllium and its compounds are toxic |
| Chemical Composition | 100Be |
| CAS Registry ID | 7440-41-7 |
| EXPERIENCE IN PRACTICE |
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| Development Status | Commercial Product |
| Equivalent Designations | Be |
| Space Experience | Good |
| PHYSICAL PROPERTIES |
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| Atomic Number | 4 |
| Atomic Weight | 9.01 amu |
| Crystal Structure | Hexagonal close packed (hcp) |
| Specific Gravity | 1.79 to 1.86 |
| Magnetic Properties | Nonmagnetic |
| ELASTIC PROPERTIES |
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| Tensile Modulus | 304 to 306 GPa |
| Shear Modulus | 131 to 148 GPa Remark: by torsion samples unetched prior to test |
| Bulk Modulus | 130 GPa |
| Poisson Ratio | 0.024 to 0.028 |
| Speed of Sound (longitudinal) | 12900 m/s |
| Speed of Sound (transverse) | 8880 m/s |
| Acoustic Impedance | 24.1 MRayls |
| ELECTRICAL PROPERTIES |
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| Electrical Volume Resistivity | 3.8e-8 ohm.m |
| Superconductivity Critical Temperature | -273 °C |
| THERMAL PROPERTIES |
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| Thermal Conductivity | 190 W/m.K |
| Thermal Expansion Coefficient | 11.5 μstrain/°C |
| Specific Heat | 1.76 J/g.K |
| Melting Range | 1320 °C |
| RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY |
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| Atmospheric Corrosion | Appears to be equal to 18-8 stainless steel |
| EMF vs SCE | -0.97 V Remark: Measured in 3.5% NaCl solution Data Quality: Design Data |
| Machinability | Beryllium is unusually prone to surface damage during machining. Generalized cracking may occur beneath the machined surface to several times the depth of the cut. Beryllium cannot be rolled or drawn to any degree at RT. |
| Welding | helium-shielding and pressure welding is possible |
| Brazing | Furnaze brazing in argon atmosphere is possible |
| Soldering | After plating with copper beryllium may be soldered in the normal manner. |
| Plating | To obtain an adherent, electroplating, it is necessary to etch or the zincate the parts |
| SPECIAL RECOMMENDATIONS |
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| Special Recommendations | To remove surface layer to a depth of 7.5um to 15um: Electrolytic: Methyl alcohol:10% HNO3: 2.5%NaF=3:1:1 for 15 min at 2.5A Chemical: 7%Cr2O3+85%H3PO4+5% H2SO4 for 5 to 10 min at 100C |