Thermoplastic hot melt adhesive

According to DIN EN 9231 a hot melt adhesive is defined as a thermally meltable adhesive system that developes after cooling a cohesion (internal stiffness).

Thermoplastic hot melt adhesives can melt reversibly. For sufficiently high temperature stress they are again liquid, thus losing their cohesion.
Once the bond has taken place, the visco-elastic polymers make sure even after their cooling that the adhesion, the volume change and mechanical tension is maintained.
The established cohesion mediates the bonding forces between the substrates.

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