Tack (Adhesive)

It is quite easy to tell when a material is tacky or sticky simply by touching it and feeling how difficult it is to remove it from our fingers. The tackiness is the ability of a material to adhere instantaneously to a solid surface when brought into contact by a very light pressure. The formation of the adhesive bond is not directly measured, but assessed by breaking bonds. This test configuration allows the quantification of this mechanical property. This test method is applicable to the adhesives which form a bond of measurable strength rapidly upon contact with another surface and which can be removed from that surface cleanly, that is, without leaving a residue visible to the eye. For such adhesives, tack may be measured as the force required to separate (at controlled speed) an adhesive and the adherend at the interface shortly after they have been brought into contact under a defined load of known duration.