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Reactive Hot Melt Adhesives (PUR, POR)

Reactive polyurethane-based hot melt adhesives (PUR) are becoming increasingly significant. These can be used to realize high-strength structural bonds. Once the reactive PUR hot melt has been applied, it initially sets physically, followed by a chemical reaction with the humidity resulting into highly molecular polymers with a very high cohesion. This enables extraordinarily high adhesion values, high degrees of temperature resistance, high flexibility at cold temperatures and solvent resistance.

It is important to bear in mind that it may take a while for the adhesive bond to reach its final strength, depending on the moisture content available for chemical cross-linking. To prevent undesirable reactions while the PUR adhesive is in storage, reactive hot melt adhesives are packaged in moisture-proof containers.

Another group in the reactive hot melt adhesives segment are silane-modified polyolefin-based formulas (POR). Compared with PUR hot melts, these are characterised in particular by the fact that they stick much better to untreated substrates such as polyethylene (PE) and polypropylene (PP). Furthermore, they also contain no isocyanates and therefore do not have to be labelled as hazardous goods. In contrast, their cohesion properties are far below those of polyurethane-based adhesives.

Application technology for reactive adhesives

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E70931.2

Structural bonds with high demands on strength and temperature behaviour.

  • Moisture curing
  • Good solvent resistance
  • High cohesion, even at low temperatures

E71075.2

Structural bonds with high demands on strength and temperature behaviour.

  • Moisture curing
  • Good solvent resistance
  • Rapid absorption of relatively high shear forces

B71452.1

For bonds with high demands on temperature behaviour.

  • Solvent-free
  • High heat resistance
  • Good cold flexibility

E72456UVM

Assembly and construction bonds that are exposed to high temperatures

  • Moisture curing
  • UV marked
  • Good solvent resistance