Description
Tack defines the degree to which an adhesive will stick to a surface on first contact. Tack allows an adhesive on a pressure sensitive label to “wet” a surface and form an appropriate bond. The tack increases on smooth or heated surfaces (high surface energy) and decreases on rough or cold surfaces (low surface energy). See chart below. Tack can be laboratory tested by measuring the amount of force needed to peel it away from a substrate.
Low tack – defines an adhesive which, all other conditions being equal, has a low initial grab.
High tack – defines an adhesive which, all other conditions being equal, has a high initial grab.
Adhesive performance is highly dependent on its contact with a surface–it should be applied with firm pressure on a dry surface that is free of contaminates.
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