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Why are lead cores for automatic pencils made of resin?

Source: Time:2018-02-16 14:35:55 views:

Lead core is not unfamiliar to everyone. The main components of pencil lead are graphite and clay. According to the national standard, the pencil can be divided into 18 types according to the concentration of graphite. Later, it was made into fine pencil lead and widely used in the replacement core of automatic pencil. Now, there is a new member of pencil lead, resin lead. Resin lead core has higher strength and is not easy to break.
Lead core is not unfamiliar to everyone. The main components of pencil lead are graphite and clay. According to the national standard, the pencil can be divided into 18 types according to the concentration of graphite. Later, it was made into fine pencil lead and widely used in the replacement core of automatic pencil. Now, there is a new member of pencil lead, resin lead. Resin lead core has higher strength and is not easy to break.