Tack Loop Test for Testing the Adhesive Strength of Adhesive Tapes

Tack is the initial adhesion. It is expressed as the tearing force of a loop material which has been brought into contact with the surface of a test platen.  

A strip of a pressure sensitive material is formed into a loop with the adhesive side outwards. With the testing machine the loop is brought in contact with a test plate. When a defined contact area is reached, the loop is pulled off. This test is described in Finat test method No. 9.