19. HB pencil lead contains..
A) Graphite and Clay
B) Lead and Clay
C) Only graphite
D) Only clay
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HB pencil lead contains graphite and clay.
• A pencil contains a solid pigment core that is typically called graphite.
• Most of the pencil cores are made up of graphite powder mixed with a clay binder.
• Graphite is a none toxic material commonly used in pencils.
• HB pencils 'H' stands for Hardness and 'B' stands for Black.
• Pencil makers adjust the core hardness usually identified by a number of letters.
• The standard writing pencil is graded HB.
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HB pencil lead contains Graphite and Clay.
Option: A
Explanation:
- Lead pencil is a misnomer. This is because it does not contain any amount of lead. The only composition of a lead pencil is graphite and Clay.
- Clay determine tensile strength of the pencil. The graphite gives a characteristic shine on the pencil.
- This is visible when the pencil is sharped and the edges of the graphite signs. Different types of pencil is has different types of hardness. The more the amount of clay the harder the pencil is.
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