the bonding partners facilitates a significantly increased resistance of the bond against heat (over 120 °C) as well as water and steam. Handling the then new [...] physical build-up of strength which results in the initial strength of the bond. This is followed by a chemical crosslinking in which the adhesive reacts with [...] on the substrate surface, thus improving adhesion and making it possible to bond even difficult materials, for instance aluminium edgebands. PUR hot melt adhesives
https://www.jowat.com/es-CO/detalle-de-la-sala-de-redaccion/zero-joint-top-performance/