Tensile adhesion is one of the methods used to determine the adhesion of a coating either to the substrate or to another coating in a protective coating system and this method is often referred to as the pull-off test.
There are National and International standards that describe the use of portable tensile adhesion testers and BS EN ISO 4624 and ASTM D4541 both describe several different test apparatus for pull-off testing; however, the basic approach of gluing a test dolly to the coated surface and then exerting a perpendicular force to the surface in an effort to remove both the dolly and the coating from the substrate is common to these standards.
The measure of this bond is the value of pull-off adhesion [f.sub.b] determined in practice by the pull-off method.
The proper preparation of the base layer, which can be described in terms of surface roughness, is a major determinant of pull-off adhesion [f.sub.b] at the interface between the concrete layers in a floor (Kuzinovski et al.
The shape orientation and/or flexural modulus of the hook elements can be remotely changed to provide a reduction or magnification in the shear and/or pull-off
forces, in addition to providing variable damping capabilities to the fastener system.
The Candystripes lost the first leg to Cypriot side Apoel Nicosia 2-1 10 days ago but the feeling within the camp is that Dermot Keely's troops could pull-off
a surprise win in the return leg.
Its constant motorized pull speed assures consistent pull-off
Dupont chose a Friday to pull-off
the deception in this country in the hope that as the transatlantic time difference meant "Texas was asleep", the swindle would not be discovered until after the weekend.
The first deceptive techniques discussed are "range gate pull-off
" and the related "inbound range gate pull-off
Elcometer has launched its latest range of pull-off
adhesion testers--the Elcometer 506.
A system based on one of these stands, a force gauge or loadcell, and appropriate fixtures and accessories can be used to measure pull-off
resistance of crimped electrical connectors; peel strength of induction-sealed foils and adhesive films or labels; characteristic forces and deflections of switches and keypads; top-load strength of bevcans, PET bottles and other containers; insertion and withdrawal forces of connectors, fasteners, blades/needles or corks; and performance of compression springs, tension springs and spring assemblies.
In response to an industry-wide need for a reliable, versatile and easy to use adhesion tester, DFT Instruments has recently introduced the new PosiTest Pull-Off