A PS adhesive characterized by having relatively high ultimate adhesion. The label either cannot be removed intact or requires a great deal of force to be removed. One measure is that the force required to remove the adhesive is greater than the tensile strength of the label, or the tear strength of the product surface. For example, a label, which is firmly attached to a plastic surface, but which can be removed from it, intact, may be considered to be non-permanent for that application; however, that same label may destroy the surface of a cardboard box by ripping up fibers, i.e. the force to destroy the label is greater than that of the box surface.