The surface of the gypsum board is covered with a piece of kraft paper, and the paper on the surface of the high-quality gypsum board should be treated strictly, very strong and tough. When choosing plasterboard, you can sense this paper uncover look, strong feeling when opened the paper and plaster surface viscosity is not strong, if easily reveal that the gypsum board is easy to breakdown and damage. There is also a kind of method, that is, two people lift the plasterboard work long both ends, the plasterboard sagging bending degree among them, the high quality gypsum board better hardness, bending degree will not be too big commonly, can even slight jitter plasterboard, if there is no fracture toughness of gypsum board, belong to high quality gypsum board.
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