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(Hundred) Gauge Knife – Paint film adhesion testing

Cutting tool: A grid knife is generally used, but in the absence of one, shaving blades, scalpels, and other cutting tools can be used as well； However, the angle of the blade is required to be 15°-30°. The testing tool can have either a single blade or multiple blades ； The blade is required to have good performance. Adhesive tape: Pressure-sensitive tape with a width of 25 mm; its adhesive strength is determined based on the actual requirements of the supplier and the user (in the laboratory, tape with a strength of 9 N/25 mm (+/-1) is generally used). Cutting guide strip: For manual cutting (as opposed to mechanical cutting), a long, straight, and rigid strip is needed to ensure that the cut is straight. The guide bar is marked with scales in increments of 0.5 mm, to be used for measuring the width of the two cuts. Lighting system: A good lighting system helps to check whether the cut has penetrated the substrate and to examine the test results. Magnifier: The magnifier is used to assist in making individual cuts and to examine the test results. Test sample: Select an appropriate area on the material to be tested (the area should be free of any defects or stains, and its surface must be clean and dry) ； Moreover, the testing area must be flat. Eraser: Use the eraser to rub back and forth on the tape so that it adheres well to the cut area.

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