Materials of pencils

Graphite used for the core of a pencil

Graphite (graphite graphite) is also known as a stone ink and is naturally produced as a companion of Diamond and Coal (allotrope). Unlike the same fellow coal, it has a layered structure and is slippery between layers, which is a factor that gives the smoothness of writing. The graphite for pencils is roughly classified into scaly graphite and soil-like graphite from its appearance, and the color is a little lead color. We have a well-balanced mix of soil graphite that tends to be smooth, scaly graphite and black. These are natural minerals and are mainly imported from China. In the tree story, we use recycled graphite (such as crushed graphite products and blast-by-product graphite).