How are pencils classified

Tools/raw materials

There are many types of pencils, and pencil specifications are usually represented by H and B. "H" is the first letter of "Hard" in English, indicating the hardness of the pencil lead. The larger the number in front of it, the harder the lead and the lighter the color. B "is the first letter of the English word" Black ", representing the composition of graphite, indicating the softness of the pencil lead and the degree of clarity in writing. The larger the number in front of it, the darker and darker the color.

Classification of properties and uses

graphite pencil

A pencil lead made primarily of graphite. Can be used for drawing and general writing. The hardness mark of graphite lead is generally represented by "H" for hard pencils, "B" for soft pencils, "HB" for pencils with moderate hardness, and "F" for pencils with hardness between HB and H. Graphite pencils are divided into 6 parts B、5B、4B、3B、 2B、B、 HB、F、H、2H、3H、4H、5H、6H、7H、8H、9H、10H Waiting for 18 hardness levels, the larger the number before the letter, the harder or softer it indicates. In addition, there are soft pencils in grades 7B, 8B, and 9B3 to meet special needs such as painting