Mechanical pencils, also often referred to as "lead lead" or "automatic pencil lead", are thin strips of graphite and clay mixture used in mechanical pencils. They are used for writing and drawing, and are not easy to break and easy to replace.
Some details about the automatic lead core: material The automatic lead core is mainly composed of graphite and clay. The graphite gives the lead a black or grey writing effect, while the clay determines the hardness and strength of the lead. The two materials are mixed and pressed into thin strips, which are then fired and hardened at high temperatures. Hardness class Automatic lead cores have different hardness grades, which determine the color depth and thickness of the lines left behind when writing. Hardness levels are usually represented by letters plus numbers, such as: 1.H series: indicates the hard lead core, such as 9H, H, etc., suitable for drawing fine lines and sketches. 2.B series: indicates the soft lead core, such as 2B, 6B, etc., suitable for drawing dark and thick lines. 3.HB: indicates medium hardness and is the most commonly used lead core.
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