Pencils, graphite

tvrdosť ceruziek

Značenie tvrdosti grafitových ceruziek

Európsky systém používa kombináciu písmen H (hard) tvrdý, F (firm) pevný a B (black) mäkký.
Najmäkšia tuha je 9B a najtvrdšia je 9H (čím väčšie číslo - tým väčšia mäkkosť alebo tvrdosť).

Tvrdosť tuhy určuje podiel grafitu a ílu. Čím viac je ílu primiešaného, tým je tuha tvrdšia.

V obchodoch môžete taktiež naraziť na označenie ceruziek 1, 2 a 3, ide o tri najpoužívanejšie tuhy pre školákov.
Ceruzka č. 1 odpovedá tuhe B, ceruzka č. 2 tuhe HB a č. 3 označuje tuhu H.
Jednotka a dvojka sú určené na písanie a kreslenie, trojka je tzv. rysovacou ceruzkou.

Price and labels
Lead Size
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Leads Hardness
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Producer
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Code:160 19

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Code:0286

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Code:160 04

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Code:0565

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Code:472 17

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1,9 € with VAT
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Code:511911

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1,94 € with VAT
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Code:517010

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1,2 € with VAT
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Code:241 31

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Code:2850403

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STABILO EASYergo micropencil, HB, 1.4 mm, for right-handed people, blue-green
Code:46902

STABILO EASYergo micropencil, HB, 1.4 mm, for right-handed people, blue-green

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8,9 € with VAT
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STABILO EASYergo micropencil, HB, 1.4 mm, for right-handed people, orange-blue
Code:46905

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Code:060003

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Code:134763

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Code:0287

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0,55 € with VAT
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