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Polyurethane structural adhesives (PUR)

Polyurethane adhesives are also part of the group of reactive adhesives and also addition-curing. The polymers offer a range of properties from low crosslinked (elastomers with high elongation at break) to strongly crosslinked (duromers). The use of polyurethane adhesives is virtually unlimited, depending on the pre-treatment of the substrates.

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1-component polyurethane adhesives

The pasty prepolymers with terminal isocyanate groups, which crosslink to a high-strength and permanently elastic elastomer under the effect of sufficiently high humidity (40 to 70 %), are mostly used as adhesives for direct glazing or sealants in automotive engineering.

2-component polyurethane adhesives

The mostly low-viscosity isocyanate-terminated prepolymers and polyols harden by polyaddition to an elastomer or duromer within a period of a few hours to days, depending on the type. Temperature can accelerate curing and increase strength. They have stable mechanical properties over a wide temperature range.

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