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.

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(1)
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(1)
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Ergonomic triangular graphite pencil HB for left-handed people - STABILO /2 pcs
Code:B-59065-5

Ergonomic triangular graphite pencil HB for left-handed people - STABILO /2 pcs

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Graphite pencil, HB, hexagonal, STAEDTLER "Noris"
Code:TS1202

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Graphite pencil MAPED "BLACK'PEPS" HB with eraser 1pc
Code:9854021

Graphite pencil MAPED "BLACK'PEPS" HB with eraser 1pc

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Graphite pencil KOH-I-NOOR 4B, 1 pc
Code:0283

Graphite pencil KOH-I-NOOR 4B, 1 pc

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Graphite pencil KOH-I-NOOR JUMBO 8B, 1 pc
Code:0291

Graphite pencil KOH-I-NOOR JUMBO 8B, 1 pc

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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:0292

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HB STABILO graphite pencil - orange
Code:160/03 - HB

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STABILO EASYgraph graphite pencil for left-handed people - light blue
Code:321/02-HB

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Code:2160/01 - HB

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Code:326/04-HB

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Code:0287

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CRT pencil Fine art graphite 2B
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HB yellow pencils with rubber ,12 pcs/set
Code:0216

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Pencil Faber-Castell Grip Jumbo B
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CRT pencil Fine art graphite 9H
Code:160 19

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CRT ceruzka Fine art graphite 3B
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Code:BYM10016

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