What Is a Carpenter's Pencil?

Pencil (qin b, Pencil) is a kind of special pen used for writing and drawing sketches. It has a history of more than 400 years. Among them, pencils for drawing sketches are divided into many types and they are divided into three stages of development. , Divided into graphite, wooden pen holder, pencil with cap; in addition, its color has red and white, black and white, yellow and black stripes.

1662 in Germany

Pencil lead

It is divided into two parts: pencil cap and pencil rod. The material used for the decoration of the pencil cap is mainly polyester. The manufacturing process can be divided into mold making, offset printing, and assembly to complete it. The main decoration material of the pencil rod is nitro fiber.

1. Is the pencil lead poisonous?

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

The main component of a pencil refill is graphite and clay. Graphite is a scaly solid metallic luster. Among them are carbon-carbon chemical bonds. Between layers is van der Waals force. Carbon-carbon chemical bonds are very stable. It s very difficult, which is why diamond and graphite are made of carbon, but the physical properties and prices are very different. There is nothing in the human body that can break the carbon-carbon chemical bond. The clay added inside is harmful to human health).

2. Is the pencil rod poisoned by metal?

The outer surface of the pencil rod has a wrapping mold or uses pencil lacquer technology, which can protect the pencil rod on the one hand and increase the appearance on the other hand, but the pigment will contain trace heavy metals. A small amount of contact will not affect it, but it won't affect the mouth of the pencil rod. Right.