Debonding occurs when an adhesive stops sticking (adhering) to an adherend or substrate material. The adhesive does not have to be an organic, polymeric material; it could be an inorganic coating, for instance. Debonding develops if the physical, chemical or mechanical forces that hold the bond together are broken, perhaps by a force or environmental attack. Delamination is a failure in laminated material, often a composite, which leads to separation of the layers of reinforcement or plies.