Pencil Lead Hardness Chart. Pencil 'Lead' Pencil lead is made of a mixture of graphite and clay. These are combined with a number to represent how hard or soft the pencil lead is.
How to know what pencils to use while sketching? How do you decide what ... (Jim Allison) The HB graphite grading scale is used to determine the hardness and the darkness of pencils. Pencil lead is a mixture of graphite and clay. These are combined with a number to represent how hard or soft the pencil lead is.
Feeling confused about lead hardness grades?
The numeric scale is used only on graphite products manufactured in (or marketed to) the USA.
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This can be illustrated well with an example: A pencil of hardness HB is of medium hardness in Europe, a soft pencil in Japan, and a pencil with a hard lead in the USA. For a deeper explanation you can read th. The higher the number the harder the writing core and the lighter the mark left on the paper.
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