Application Description

A supporting role - Special adhesives for load-bearing glulam

Manufacturers of wood elements for load-bearing construction purposes face great challenges. On the one hand, the production process is subject to special standards, and on the other hand the used adhesives have to be approved for building purposes and certified. In addition, each individual application, whether fingerjointing or laminating, has a unique set of requirements. Jowat supplies a product portfolio with one-component, moisture-curing polyurethane prepolymer adhesives which are adapted specifically to the different applications and products – from glued laminated timber (GLT) to cross laminated timber (CLT), and from solid structural timber to I-Joist formwork beams. The performance of these adhesives from the Jowapur® series has been extensively verified in complex procedures before release. Due to their specific composition, characteristics and processing parameters, these adhesives meet the demands of the different applications in the manufacture of load-bearing glulam. For instance, several special adhesives from the Jowapur® series are particularly suitable for fast and flexible production processes due to their short processing time. Other products provide a long assembly time and therefore facilitate the manufacture of big parts and large batches.

building by night with glued laminated timber (glulam)
Applying single component glue in the manufacturing process of glulam
special adhesives for application in the manufacture of glulam

Polyurethane adhesives provide several advantages for the manufacture of load-bearing wood parts and a superior product quality compared to other systems such as condensation resins. They are completely free of formaldehyde and can be applied in a much lower grammage due to a solids content of 100 %. In addition, prepolymers cure within a few minutes at room temperature and provide an invisible bondline due to their colourless appearance.

Jowapur® adhesives are processed as a single component. Mixing, pot life and adhesive remnants from too much prepared adhesive become obsolete. The minimal foaming prevents the lamellas from sticking together when they are stacked on top of or next to each other and significantly reduces the cleaning effort. PUR prepolymers are reinforced with fibres which prevent fingerjoints from sliding apart after pressing during production and curing time. Due to their low tendency to run off, they are ideal for contactless application systems. Jowat provides special adhesives for every application in the manufacture of load-bearing glulam and for all established application technologies.

Product Information

Jowapur® 681.xx product series

Get more information one our new certified portfolio for fingerjointing and laminating

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Base Viscosity [mPas] /
Temperature [°C]
Open assembly time [min] /
Temperature [°C]
Application Certificate Download
technical
data sheet (PDF)
Jowapur® 680.20 1-component PUR prepolymer 10500 / 20 10 - 20 / 20 Fingerjointing Z-9.1-771 de en fr
Jowapur® 686.20 1-component PUR prepolymer 10500 / 20 10 - 20 / 20 Fingerjointing Z-9.1-622 de en fr
Jowapur® 686.30 1-component PUR prepolymer 10500 / 20 10 - 20 / 20 Glulam and Fingerjointing Z-9.1-691 de en fr
Jowapur® 686.60 1-component PUR prepolymer 10500 / 20 30 - 70 / 20 Glulam and Fingerjointing Z-9.1-636 de en fr
Jowapur® 681.10 1-component PUR prepolymer 15500 ± 2500 / 20 10 / 20 Manufacturing bonded load-bearing timber structures Adhesive type: EN 15425–I–70–GP–0.3–w de en fr
Jowapur® 681.40 1-component PUR prepolymer 15500 ± 2500 / 20 40 / 20 Manufacturing bonded load-bearing timber structures Adhesive Type: EN 15425–I–70–GP–0.3–w de en fr
Jowapur® 681.60 1-component PUR prepolymer 15500 ± 2500 / 20 60 / 20 Manufacturing bonded load-bearing timber structures Adhesive type: EN 15425–I–70–GP–0.3–w de en fr

The products listed only represent a limited selection of the available product portfolio. Product availability might differ by region. The technical data, characteristics and field of application provided in the table outline the differences between the individual adhesives of the product portfolio. Our Application Technology Department and our Sales Representatives are on hand to provide advice and support you finding the best adhesive for your particular application.

Note: The information on this page is based on test results from our laboratories as well as on experience gained in the field, and does in no way constitute any guarantee of properties. Due to the wide range of different applications, substrates, and processing methods beyond our control, no liability may be derived from these indications nor from the information provided by our free technical advisory service. Customer trials under everyday conditions, testing for suitability at normal processing conditions, and appropriate fit-for-purpose testing are absolutely necessary. For the specifications as well as further information, please refer to the latest technical data sheets.