D2 = Interior areas, with occasional short term exposure to running or condensed water and/or to occasional high humidity, provided the moisture content of the wood does not exceed 18% There are 4 main types of durability grading, running from D1 to D4. The differences between these are listed below:

D4 PU adhesives are often considered to be waterproof. You can use D4 PU adhesives in interior areas where there is frequent long term exposure to water or moisture. You can also use D4 PU adhesives in exterior areas exposed to weather, so long as you apply an adequate surface coating. In normal conditions, D4 PU adhesives have a seven-day shelf life with a required bond strength of less than 10 N/mm2. If you store it in cold water for four days, the required bond strength reduces to less than 4 N/mm2. This required bond strength can be maintained if placed in boiling water for six hours, then cold water for two. D1 adhesives are the lowest in terms of durability. These adhesives work in interior areas in which the temperature rarely exceeds 50C. In addition, you can use them on wood with a moisture content up to 15%. They have a storage life of up to seven days in standard room temperatures and humidity. They have a required bond strength of less than 10 N/mm2, and you should use them for external wood bonding. D2 Adhesives D4: Bespoke furniture. High quality joinery, including windows, doors etc. in extreme situations. Timber frame applications including the bonding of chipboard flooring. D3 = Interior areas, with frequent short-term exposure to running or condensed water and/or heavy exposure to high humidity. Exterior areas not exposed to weather

Advanced System

One adhesive does all - our D4 Glue saves time and money for the installation of chipboard flooring. EVERBUILD D4 Wood Adhesive provides the user with a waterproof D4 grade wood adhesive with none of the safety issues associated with conventional Litre Solvent Free External High Grade Industrial D4 Wood Adhesive Based on the latest hybrid resin technology. These gradings are part of the European standard BS EN 204 governing the classification of wood glues for non-structural applications.

D3 adhesives are considered to be water-resistant. You can use them in interior areas where there is frequent short term exposure to water or moisture and frequent high humidity. Unlike the previous grades of adhesives, you can use D3 outdoors in areas not exposed to the weather. In normal conditions, D3 has a seven-day shelf life with a required bond strength of less than 10 N/mm2. If stored in cold water for four days, it will have a required bond strength of less than 2 N/mm2. After a further seven days of storage, the required bond strength increases to less than 8 N/mm2. D4 Adhesives If you are new to using PU adhesives, you may be wondering why they have a D in their title. You might be asking just how a D4 PU adhesive is any different to a D3 or D2 adhesive? It might be easy to tell a Tytex 1 kg 30 Min Set PU Adhesive from a Tytex 1 kg D4 PVA Adhesive. However, the D grade stands for durability and is part of the European standard BS EN 204 which governs the classification of wood glues for non-structural applications, and it helps to show how resistant the adhesive is to water. There are four durability gradings specified, so let us look at D1 through D4 adhesives. Durability Classes: D1 Adhesives: D4 = Interior areas with frequent long-term exposure to running or condensed water. Exterior areas exposed to weather Everbuild D4 Wood Adhesive can be used internally and externally and gives a high strength, water resistant, impact and temperature resistant bondThe next step up on the durability scale are D2 adhesives. Like D1 adhesives, you should only use D2 glues for indoor work. These adhesives can cope with occasional short term exposure to water or moisture and temporary high humidity. However, the moisture content of the wood must not exceed 18%. D2 has a seven-day shelf life in normal conditions and has a required bond strength of less than 10 N/mm2. If submerged in cold water for three hours and stored for a further seven days, however, D2 has a required bond strength of less than 8 N/mm2. D3 Adhesives

For those interested in the classifications, the bond strength requirement for the different classes is listed below: Suitable for interior and exterior use, once applied D4 Chipboard Flooring Glue produces a foaming action causing the adhesive to foam out of the joints creating a ridge that enhances the protection of the joint – this can be easily removed once the floor is complete leaving a rigid bond that helps prevent squeaky floor boards.

D1 = Interior areas, where the temperature only occasionally exceeds 50°C for a short time and the moisture content of the wood is 15% maximum D3: High quality joinery, furniture making and veneering including flat panel lamination with plastic laminates.