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.
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
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| Base | Viscosity [mPas] / Temperature [°C] | Max. Assembly Time [min] / Temperature [°C] | Application | Certificate |
Download technical data sheet (PDF) | |
|---|---|---|---|---|---|---|
| Jowapur® 686.20 | 1-Component PUR Prepolymer | 10500 / 20 | 10 / 20 | Manufacturing bonded load-bearing timber structures (Fingerjointing) | Adhesive Type: EN 15425–I–70–FJ–0.1–w | de en fr |
| Jowapur® 686.30 | 1-Component PUR Prepolymer | 10500 / 20 | 15 / 20 | Manufacturing bonded load-bearing timber structures | Adhesive Type: EN 15425–I–70–GP–0.3–w | de en fr |
| Jowapur® 686.60 | 1-Component PUR Prepolymer | 10500 / 20 | 45 / 20 | Manufacturing bonded load-bearing timber structures | Adhesive Type: EN 15425–I–70–GP–0.3–w | 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® 681.60 | 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 |
| 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 |
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.
Get more information one our new certified portfolio for fingerjointing and laminating
News & Articles
Carrying a lot of weight - Multifaceted adhesives for load-bearing glulam
Load-bearing glulam plays a growing role in the construction industry and the use of load-bearing glulam in new buildings has been increasing for years. Intense development efforts are underway to make sure the technology meets the growing quality requirements. Jowat, the adhesives specialist from Detmold, supports that development with its know-how acquired over many years, an optimum service, and with a brand new, fully certified set of adhesives.
The right answer for every need
The new adhesives are certified according to EN 15425:2017 and their composition, characteristics, and processing parameters are specifically tailored to the requirements of load-bearing glulam applications. They can be used for fingerjointing as well as for laminating, offer the choice of assembly times between 10 and 60 minutes, and for the first time facilitate an assembly-pressing time ratio of 1:1. Industrial users can therefore optimise their processes by choosing the product best-suited for their needs. A simple change of adhesive, for instance, can help increase their production capacity or alternatively improve process reliability without the need for major investments.
Clear benefits: PUR
Compared with other adhesive systems for the manufacture of load-bearing timber components, polyurethane adhesives provide several advantages in the manufacturing process and quality of the end product because of their characteristics. They are completely free of formaldehyde and require significantly lower application amounts due to a solids content of 100 %. Depending on the formulation, the prepolymers cure at room temperature already within a very short time and are colourless, with no discernible glue line. The adhesives from the Jowapur® series are processed as a one-component system, making mixing, pot life, and adhesive remnants from production obsolete. The limited foaming can help prevent the lams from sticking together when they are temporarily stacked on top of each other or placed next to each other, and therefore considerably reduces the cleaning effort.
The Jowapur® prepolymers are reinforced with fibres that increase the bond strength and prevent the assemblies from sliding apart in the manufacturing process and while the adhesive is curing. Due to optimised flow properties, these adhesives are ideal for contactless application systems in fingerjointing units.
Impressive constructions
From Jowat’s point of view, glulam will continue to become more and more significant in future – a development that should be accelerated with optimised adhesives. “Building with engineered timber brings only advantages,” says Ralph Kirst, responsible for load-bearing glulam business development at Jowat SE. “Furthermore, adhesive bonding facilitates the manufacture of timber constructions in less time and at lower costs. Entire buildings can be prefabricated in mass production and assembled on site.” In light of these advantages, chances are more and more property developers will start using engineered timber. Not only does it make sense from an economic and ecological point of view – wood stores CO2 and helps fight against climate change. Glulam also allows for virtually limitless possibilities in modern architecture, as is demonstrated by the eye-catching design of Jowat’s “House of Technology” in Detmold or the BUGA Wood Pavilion in Heilbronn.
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