{"id":2593,"date":"2024-04-24T19:45:57","date_gmt":"2024-04-24T17:45:57","guid":{"rendered":"https:\/\/www.haefner.de\/?page_id=2593"},"modified":"2025-08-21T16:34:50","modified_gmt":"2025-08-21T14:34:50","slug":"silizium-kugel-produkte","status":"publish","type":"page","link":"https:\/\/www.haefner.de\/en\/silizium-kugel-produkte\/","title":{"rendered":"Silizium – Kugel – Produkte"},"content":{"rendered":"
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Silicon sphere<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Products \/ specifications\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tPRIMARY MASS STANDARDS<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tPRIMARY VOLUME AND DENSITY STANDARDS<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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AVOGADRO-CONSTANT NA<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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PLANCK-CONSTANT h<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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BASED ON FUNDAMENTAL CONSTANTS<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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AVOGADRO-CONSTANT N A<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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PLANCK-CONSTANT h<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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BASED ON FUNDAMENTAL CONSTANTS<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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MASS-PRIMARY-NORMAL - SILICON SPHERES<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Basicdata<\/h3>
Material<\/strong><\/th>Hochreines, monokristallines, nat\u00fcrliches Silizium, hergestellt nach dem FZ-erfahren, bestehend aus 3 Isotopen:
28Si (approx. 92%), 29Si (approx. 5%), 30Si (approx. 3%)<\/th><\/tr><\/thead>
Nominal value*<\/strong>*<\/td>1 kg<\/td><\/tr>
Diameter<\/strong><\/td>approx. 93,6 mm<\/td><\/tr>
Density<\/strong><\/td>ca. 2329 kg\/m\u00b3<\/td><\/tr><\/tbody><\/table>
\u00a0<\/div><\/div><\/div><\/div>

Specifications<\/h3>
\u00a0<\/th>Special secondary sphere (sc++)<\/strong><\/th>Secondary sphere (sc)<\/strong><\/th><\/tr><\/thead>
Mass tolerance \u0394m<\/strong><\/td>0 \/ +200 mg<\/td>0 \/ +200 mg<\/td><\/tr>
Form deviation RONt<\/strong><\/td>< 20 nm<\/td>< 80 nm<\/td><\/tr>
Surface roughness Ra<\/strong><\/td>< 0,3 nm<\/td>< 1 nm<\/td><\/tr><\/tbody><\/table>
\u00a0<\/div><\/div><\/div><\/div>

Calibration certificates (PTB)<\/h3>
Measurement uncertainties\n\nU(k=2)<\/strong><\/th>Special secondary sphere (sc++)<\/strong><\/th>Secondary sphere (sc)<\/strong><\/th><\/tr><\/thead>
Mass in vacuum<\/strong><\/td>25 \u00b5g<\/td>45 \u00b5g<\/td><\/tr>
Mass in air<\/strong><\/td>50 \u00b5g<\/td>55 \u00b5g<\/td><\/tr>
Roundness<\/strong><\/td>2,5 nm<\/td>50 nm, optional<\/td><\/tr>
Diameter<\/strong><\/td>0,3 nm<\/td>\u2013<\/td><\/tr>
Volume in vacuum<\/strong><\/td>0,010 mm\u00b3<\/td>\u2013<\/td><\/tr>
Volume in air<\/strong><\/td>0,014 mm\u00b3<\/td>0,8 mm\u00b3<\/td><\/tr>
Density<\/strong><\/td>0,004 kg\/m\u00b3<\/td>0,004 kg\/m\u00b3<\/td><\/tr>
Surface roughness<\/strong><\/td>0,15 nm<\/td>0,15, optional<\/td><\/tr>
Layer thickness<\/strong><\/td>0,4 nm, optional<\/td>\u2013<\/td><\/tr><\/tbody><\/table><\/div><\/div>
* Other nominal values possible on request<\/strong><\/em><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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VOLUME AND DENSITY PRIMARY NORMALS - SILICON SPHERES<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Specifications<\/h3>
Nominal values<\/strong>*<\/th>1 kg<\/th>500 g<\/th>200 g<\/th>100 g<\/th>50 g<\/th>20 g<\/th><\/tr><\/thead>
Diameter in mm<\/strong><\/td>ca. 93,6<\/td>ca. 74,3<\/td>ca. 54,7<\/td>ca. 43,4<\/td>ca. 34,5<\/td>ca. 25,4<\/td><\/tr>
Material<\/strong><\/td>Hochreines, monokristallines, nat\u00fcrliches Silizium, bestehend aus 3 Isotopen:
28Si (approx. 92%), 29Si (approx. 5%), 30Si (approx. 3%)<\/td><\/tr>
Density<\/strong><\/td>ca. 2329 kg\/m\u00b3<\/td><\/tr>
Mass tolerance \u0394m<\/strong><\/td>0 \/ +200 mg<\/td><\/tr>
Form deviation RONt<\/strong><\/td>< 1 \u00b5m<\/td><\/tr>
Surface roughness Ra<\/strong><\/td>< 10 nm<\/td><\/tr><\/tbody><\/table>
\u00a0<\/div><\/div><\/div><\/div>

Calibration certificates (PTB)<\/h3>
Measurement uncertainties\n\nU(k=2)<\/strong><\/th>1 kg<\/th>500 g<\/th>200 g<\/th>100 g<\/th>50 g<\/th>20 g<\/th><\/tr><\/thead>
Mass in air<\/strong><\/td>0,10 mg<\/td>0,050 mg<\/td>0,020 mg<\/td>0,010 mg<\/td>0,006 mg<\/td>0,005 mg<\/td><\/tr>
Volume in air<\/strong><\/td>0,0020 cm\u00b3<\/td>0,0010 cm\u00b3<\/td>0,0009 cm\u00b3<\/td>0,0008 cm\u00b3<\/td>0,0007 cm\u00b3<\/td>0,0006 cm\u00b3<\/td><\/tr>
Density<\/strong><\/td>0,13 kg\/m\u00b3<\/td>0,13 kg\/m\u00b3<\/td>0,30 kg\/m\u00b3<\/td>0,50 kg\/m\u00b3<\/td>0,90 kg\/m\u00b3<\/td>1,9 kg\/m\u00b3<\/td><\/tr><\/tbody><\/table>
\u00a0<\/div><\/div><\/div><\/div>

* Other nominal values possible on request<\/strong><\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Avogadro project<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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