
Silicon sphere
Products / specifications

MASS-PRIMARY-NORMAL - SILICON SPHERES
Material |
High-purity, monocrystalline, natural silicon, |
Nominal value* |
1 kg |
Diameter |
approx. 93,6 mm |
Density |
ca. 2329 kg/m³ |
Specifications
|
Special secondary sphere (sc++) |
Secondary sphere (sc) |
Mass tolerance Δm |
0 / +200 mg |
0 / +200 mg |
Form deviation RONt |
< 20 nm |
< 80 nm |
Surface roughness Ra |
< 0,3 nm |
< 1 nm |
Calibration certificates (PTB)
Measurement uncertainties U(k=2) |
Special secondary sphere (sc++) |
Secondary sphere (sc) |
Mass in vacuum |
25 µg |
45 µg |
Mass in air |
50 µg |
55 µg |
Roundness |
2,5 nm |
50 nm, optional |
Diameter |
0,3 nm |
- |
Volume in vacuum |
0,010 mm³ |
- |
Volume in air |
0,014 mm³ |
0,8 mm³ |
Density |
0,004 kg/m³ |
0,004 kg/m³ |
Surface roughness |
0,15 nm |
0,15, optional |
Layer thickness |
0,4 nm, optional |
- |
* Other nominal values possible on request

VOLUME AND DENSITY PRIMARY NORMALS - SILICON SPHERES
Specifications
Nominal values* |
1 kg |
500 g |
200 g |
100 g |
50 g |
20 g |
Diameter in mm |
approx. 93,6 |
approx. 74,3 |
approx. 54,7 |
approx. 43,4 |
approx. 34,5 |
approx. 25,4 |
Material |
High-purity, monocrystalline, natural silicon, |
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Density |
ca. 2329 kg/m³ |
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Mass tolerance Δm |
0 / +200 mg |
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Form deviation RONt |
< 1 µm |
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Form deviation Ra |
< 10 nm |
Calibration certificate (PTB)
Measurement uncertainties U(k=2) |
1 kg |
500 g |
200 g |
100 g |
50 g |
20 g |
Mass in air |
0,10 mg |
0,050 mg |
0,020 mg |
0,010 mg |
0,006 mg |
0,005 mg |
Volume in air |
0,0020 cm³ |
0,0010 cm³ |
0,0009 cm³ |
0,0008 cm³ |
0,0007 cm³ |
0,0006 cm³ |
Density |
0,13 kg/m³ |
0,13 kg/m³ |
0,30 kg/m³ |
0,50 kg/m³ |
0,90 kg/m³ |
1,9 kg/m³ |
* Other nominal values possible on request