Main components of pencil lead

The refill of a pencil is mainly composed of graphite and clay. Graphite is a scaly metallic solid, in which there is a carbon carbon chemical bond. Van der Waals force is between layers. The carbon carbon chemical bond is very stable, and it is difficult to destroy it. That is why both diamond and graphite are composed of carbon, but there is a great difference in physical properties and prices, Nothing in the human body can break the carbon carbon chemical bond, so it is certain that the pencil lead is safe (unless the clay added inside is harmful to human health).

In fact, pencil lead is not toxic, lead is toxic, and the main raw materials for manufacturing pencil lead are graphite and clay, so pencil lead is non-toxic.