2019年12月25日 · Adhesion Tools: 3M Tape (3M600 or 810), grid knives, rubber, alcohol, white cotton cloth. Testing requirements: The sample size should be greater than 20x20mm, less than this size without cutting. Sample amount: At least one sample. Testing Method: 1) To cLean key position surface with low concentration (60%) alcohol, then wipe away with cotton ...