■  Standard：GB/T 4852(A)                
■  Angle：20°～40°
■  Runway：100mm                                  
■  Steel Balls：1/32″～
■  Uses：Turn the adhesive surface of specimen upward and place it onto the test plate(inclining 30).Release freely the steel balls from large one to small one on the top.Record the number of steel ball which can stay on the tape at least 5 seconds.