Everyone of us like using pencil to write what we want to express, but how is made of?

1, Why can graphite be used as pencil lead
First, it’s black;

Secondly, it is soft and one of the soft minerals. Graphite is one of the soft minerals of carbon. Its uses include making pencil lead and lubricant. Scratch lightly on the paper and leave a mark. If observed under a magnifying glass, pencil marks are made up of tiny graphite particles.

 
The hardness and softness of ore is an important index to identify ore types.

Scientists divide the hardness and softness of ores into ten levels: graphite and talc are soft and can be engraved with nails, and their hardness is 1; The hardness of the steel is 4; The hardness of granite is 6-7; The hardness of a hard substance diamond is 10.
The making technology of paper pencil

 
There are two ways to produce paper pencils: one is soaking method; the other is soaking method; The other is gelatinization.

2, Where is the logo aera

3, How many colous can we produce

 

4, The application of pencil