What material is good for the pencil case

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There are generally two materials for pencil cases, namely canvas and nylon. Canvas is a relatively early material for pencil cases. It is a textile, strong and durable, and does not contain any harmful substances. Nylon is a chemical product, commonly known as PVC, which is a kind of plastic, and its production cost is…

What are the main ingredients of the pencil?

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The main components of the lead core of the pencil are graphite and clay. According to the national standard, pencils are divided into 18 models according to the graphite concentration. In the current standardized test in our country, the computer can only read the pencil handwriting with a lead concentration of 2B. Too thick or…