農資農科模板

The hardness mark of lead pencil is usually "H" for hard pencil, "B" for soft pencil, "HB" for moderate hardness pencil, "F" for hardness between HB and H pencil.

In 1662, the first pencil factory in the world was established in Nuremberg, Germany.

1. Is the pencil lead poisonous?It's not actually toxic, lead is toxic, and graphite and clay are the main materials used to make pencil leads, so they're not toxic.The bases of the pencil lead is ...

Divided into pencil cap and pencil rod two parts: pencil cap appearance decoration material is mainly polyester material, production process can be divided into molding, offset printing, assembly a...

Qingyuan Weixin Stationery Co., Ltd. will participate in the 17th China International Stationery and Gift Expo!Address: Ningbo International Convention and Exhibition CenterDate: July 16-18, 2020Bo...