Will long-term use of a pencil lead to lead poisoning? This question often bothers some people. In fact, people who have this problem te...

The resin lead core has strict inspection standard: 1. Lead core should be straight, round, smooth, without elbow, fracture, cut surface...

The resin lead core has strict inspection standard: 1. Lead core should be straight, round, smooth, without elbow, fracture, cut surface...

In pencil writing, the freedom and freedom of the stroke of the pen, the pen touch the paper to make a faint rustling sound, really wonde...

A graphite 2B resin lead processing method is characterized by the following steps: (1) the flake graphite was crushed into graphite pow...

A graphite 2B resin lead processing method is characterized by the following steps: (1) the flake graphite was crushed into graphite pow...

Lead core is no stranger to everyone. The lead core is graphite and clay, according to the national standard pencil, according to graphit...

This is primarily a pencil making process. If not to the end of the core is not in pencil at the end of the hollow, have to control the l...