graphite pencils

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
(5)
(3)
(1)
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(2)
(1)
(2)
(1)
(2)
(1)
(1)
(1)
(2)
(1)
(1)
(1)
(25)
(1)
(5)
(20)
Producer
(20)
(1)
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(27)
(13)
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(71)
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STABILO EASY graphite pencil for right-handed people - pink 2 pcs in a blister
Code:50648

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Graphite pencil M&G all hardnesses from 2H to 14B - set of 12 pcs
Code:70446

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Code:600460

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Code:5027

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Code:321/01-HB

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Code:07323812

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Code:02323

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Code:4907/HB-56

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Code:TTS404648

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Code:9854721

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Code:029107

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Code:TS1203

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