Graphite For Pencil Lead
The pencil lead is made of graphite as the main raw material. The lead core is mainly composed of clay, pigment, talcum powder, adhesive, grease and wax. It is a pen type for writing and drawing sketches. The hardness of graphite lead core is generally indicated by "H" for hard pencil, B for soft pencil, HB for soft and hard pencil, and F for hardness between HB and H pencil.
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