Product description

Manufacturers of glulam components for load-bearing timber applications have special challenges to master. On the one hand, production is subject to different standards. On the other hand, the adhesives used for that purpose must have been tested by an accredited institute and meet the requirements under EN 15425:2017.

Furthermore, the processing characteristics of the adhesive have to match the very specific requirements of every individual applications, from fingerjointing to laminating operations.

Certified portfolio for fingerjointing and laminating

The Jowapur® 681.xx series supplied by Jowat provides a comprehensive portfolio of one-component, moisture-curing PUR prepolymer adhesives with different product versions for a wide variety of processes in the production of load-bearing timber. All products in the series are tested according to the European Norm 15425:2017 in which the Performance requirements for polyurethane adhesives in engineered timber structures are specified.

Compared to other adhesive systems for load-bearing glulam, e.g. condensation resins, Polyurethane adhesives provide several advantages for the manufacturing process and for the end product. They are completely free of formaldehyde and require significantly lower application amounts due to a solids content of 100 %. In addition, the prepolymers cure at room temperature within a few minutes already. They are colourless, which facilitates visually discreet glue lines. Jowapur® adhesives are processed as a one-component system, and therefore mixing, pot lives and production remnants become obsolete.

Optimised assembly-pressing time ratio

The adhesives of the Jowapur® 681.xx series have undergone carful and extensive preliminary testing
and provide an optimum fulfilment of the needs in engeneered timber applications due to their composition, characteristics and processing parameters. They can be used for fingerjointing as well as for flat bonding, offer the choice of assembly times between 10 and 60 minutes, and facilitate an assembly-pressing time ratio of 1:1 that has never before been achieved.

Fibre-reinforced for high initial strength and bond strength

Industrial users can optimise their processes by choosing the formulation best-suited for their application.
A simple change of adhesive, for instance, can lead to the realisation of an increase in capacity or alternatively improve process reliability without the need for major investments. Another benefit of the Jowapur® prepolymers is that they are reinforced with fibres, which increases the bond strength while the adhesive is curing. This virtually eliminates the risk of the fingers sliding apart during manufacturing after they have been pressed together.

The Jowapur® 681.xx series provides certified, highly efficient bonding solutions for every field of application in the production of load-bearing timber. The product portfolio is complemented by Jowat’s own comprehensive service in all things adhesive.

Application description

Jowapur® 681.xx is a joint-filling, fibre-reinforced one-component adhesives series based on polyurethane with an optimal fibre geometry. It cures with wood moisture and/or ambient humidity to create a water-insoluble resin, and is used for manufacturing load-bearing timber.

Technical data

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Characteristics Max. assembly time [min] /
Temperature [°C]
Min. pressing time [min] /
Temperature [°C]
Min. curing time [min] /
Temperature [°C]
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technical
data sheet (PDF)
Jowapur® 681.xx Adhesive Type: EN 15425–I–70–GP–0.3–w from 10 to 60 minutes, depending on adhesive type from 10 to 60 minutes, depending on adhesive type from 10 to 60 minutes, depending on adhesive type de en fr