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Grade: Grade 25
Formula: Si
Form: Balls
Material: Silicon
CAS Number: 7440-21-3
Commodity: Metals
Diameter:
0.48mm
Type:
Precision Sphere
Sphericity:
0.625µm
Grade 25 Silicon Balls are a range of precision balls produced by Goodfellow. Available in 2 variations, these high purity silicon balls exhibit excellent corrosion resistance and high strength-to-weight ratio. Grade 25 Silicon Balls find use in applications from ball bearings to flow regulators in chemical plants. Their precise dimensions and silicon composition make them ideal for experimental apparatus requiring inert, dimensionally stable sphere components.
Tolerances
Balls
| Diameter | Standard | ±5% |
|---|---|---|
| Diameter | Precision | See Item |
Material Properties for Metals
Atomic Properties
| Element | Value |
|---|---|
| Atomic number | 14 |
| Crystal structure | Diamond |
| Electronic structure | Ne 3s² 3p² |
| Valences shown | 4 |
| Atomic weight( amu ) | 28.0855 |
| Thermal neutron absorption cross-section( Barns ) | 0.16 |
| Photo-electric work function( eV ) | 4.2 |
| Natural isotope distribution( Mass No./% ) | 30/ 3.10 |
| Natural isotope distribution( Mass No./% ) | 29/ 4.67 |
| Natural isotope distribution( Mass No./% ) | 28/ 92.23 |
| Atomic radius - Goldschmidt( nm ) | 0.117 |
| Ionisation potential( No./eV ) | 5/ 167 |
| Ionisation potential( No./eV ) | 1/ 8.15 |
| Ionisation potential( No./eV ) | 2/ 16.3 |
| Ionisation potential( No./eV ) | 3/ 33.5 |
| Ionisation potential( No./eV ) | 4/ 45.1 |
| Ionisation potential( No./eV ) | 6/ 205 |
Mechanical Properties
| Element | Value |
|---|---|
| Hardness - Mohs | 7 |
| Material condition | Polycrystalline |
| Poisson's ratio | 0.42 |
| Bulk modulus( GPa ) | 100 |
| Tensile modulus( GPa ) | 113 |
Electrical Properties
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 23 x 10¹⁰@20@20°C |
| Thermal emf against Pt (cold 0C - hot 100C)( mV ) | -41.56 |
Physical Properties
| Element | Value |
|---|---|
| Boiling point( C ) | 2355 |
| Density( gcm⁻³ ) | 2.34@20°C |
Thermal Properties
| Element | Value |
|---|---|
| Melting point( C ) | 1410 |
| Latent heat of evaporation( J g⁻¹ ) | 13700 |
| Latent heat of fusion( J g⁻¹ ) | 1650 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 703@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 80-150@0-100°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 4.7-7.6@0-100°C |