What kind of paper is jam? What else can I get from it?
White cardboard is a strong thick, large quantitative paper.
The most common cardboard is not painted, known as white cardboard. If the color in color is called the color cardboard. White paper named "white", so the white degree is high, the A whiteness of not less than 92%, B is not less than 87%, not less than 82% C. When the whiteness is over 90%, it's a bit bright.
Once a man intends to quantitative basis, divided into: paper, cardboard and cardboard; early in the Shanghai market to quantitative 200g/ square meters of white paper (smooth surface, after light pressure, higher stiffness, also known as thin cardboard), called heavy paper. In fact, it is also a kind of paper jam.
