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instruction 1.Placing the test piece on a tablet of sufficient hardness. 2.Holding the handle of the program grid, keeping the multi-blade cutter perpendicular to the plane of the test piece. 3.By using the uniform force, with the manner of not fibrillation and balance and 20-50mm/S cutting speed to draw. 4.Rotating the test piece to 90 °, repeating the above operations, so as to enable to cut a grid lattice graphics. 5.Brushing the two diagonals of grid lattice graphics by using the soft brush gently backward and forward each five times. 6.The test should be taken at least in three different locations on the test piece. If the results of three positions are different,the test should be repeated in more than three positions, and record all results.