The structure of components ：
Gray cardboard is a cardboard made of recycled waste paper, which is an environmentally friendly packaging material. The products are divided into single gray, double gray and full gray, which are environmentally friendly packaging materials.
Gram weight ：250g-400g/m2
Functions and uses：
Gray board paper can be used for packaging boxes, advertising boards, folders, photo frame backs, bags, hardcover books, storage boxes, samples, liners, puzzles, partitions, etc.
Characteristics of paper ：
The basis weight, thickness, tightness, stiffness, smoothness, expansion ratio, etc. are all datas used to determine whether the grayboard paper is of high quality.
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