What's the difference between white cardboard and whiteboard?

Because white cardboard is made of virgin pulp, and cardboard is made of waste paper pulp. Protoplasm, also called protoplasm, is extracted directly from the forest. Because the fibers of this pulp have never been destroyed, the cardboard made of it has high stiffness and excellent technical indicators. On the other hand, cardboard is made of waste paper pulp. Paper made of this kind of pulp does not have good physical properties and cannot meet the requirements of very high-grade packaging and printing. At the same time, because it contains waste pulp, it can not directly contact with food, so its use is limited.