0~60μm: hard substrate, 1mm pitch blade 0~60μm: soft substrate, 2mm pitch blade 61~120μm: hard or soft substrate, 2mm pitch blade 121~250μm: hard or soft substrate, 3mm pitch blade It is suitable for the determination of the adhesion of organic coatings by the cross-cut method, and evenly draws a square of a certain size and size, and evaluates the degree of adhesion of the coating to the substrate by evaluating the integrity of the coating in the square Operation and usage 1. Place the test piece on a flat plate with sufficient hardness 2. Hold the handle of the scratcher so that the multi-blade cutter is perpendicular to the plane of the test piece 3. Cut with a uniform pressure, a stable and non-vibrating technique and a cutting speed of 20-50mm/s 4. Rotate the test piece 90 degrees and repeat the above operation on the cut cut to form a grid pattern 5. Use a soft brush to brush the diagonals of the grid pattern back 5 times and brush the test piece forward 5 times. 6. The test should be completed in at least three different positions of the test piece. If the test results of the three positions are different, the test should be repeated in the redundant position and all the results should be recorded at the same time 7. If you need to change the multi-blade cutting knife, use a screwdriver to loosen the two screws on the knife body, replace the knife used, put the blade of the knife to the side of the handle, and tighten the screw