charcoal pencil

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.

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Code:2850403

Paper spreader MILAN 30 mm / set of 3 pcs

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Code:2820412

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Code:2800412

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Code:105331

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Code:2840412

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Code:BWM94710

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Code:0343

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Code:2830412-1

Paper spreader MILAN 12.5 mm / 1 pc

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0,84 € with VAT
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Artificial angle KOH-I-NOOR 5.6 mm, black, set of 6 pcs
Code:0334

Artificial angle KOH-I-NOOR 5.6 mm, black, set of 6 pcs

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Code:2830412

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Code:7804

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Code:2810412

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Code:7806

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Code:617024

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