D references of adhesives are commonly used to identify the water resistance of wood bonding adhesives, but strictly speaking they relate to the durability of the adhesive, not just the water resistance. The standard used to determine the durability class is EN 204: 2001 –“Classification of thermoplastic wood adhesives for non-structural applications”. Ideal for all general woodworking and joinery uses, assembly line work, RF HF cure systems, wood on wood laminating, furniture assembly and house hold DIY use. EVERBUILD D4 Wood Adhesive provides the user with a waterproof D4 grade wood adhesive with none of the safety issues associated with conventional

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If the grade is classified as D4, then that means that it should have gone through the testing to ensure that it does meet the requirements. The full D4 classifcation is set out in the EN 204 standard. 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.One adhesive does all - our D4 Glue saves time and money for the installation of chipboard flooring. 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:

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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 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 The 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

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D3 = Interior with frequent short-term exposure to running or condensed water and/or to heavy exposure to high humidity. Exterior not exposed to weather. Everbuild D4 Wood Adhesive can be used internally and externally and gives a high strength, water resistant, impact and temperature resistant bond D2 = Interior 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%. Practically D1 and D2 are considered to be “interior grade” adhesives and should not be used anywhere where a high level of durability is required. Litre Solvent Free External High Grade Industrial D4 Wood Adhesive Based on the latest hybrid resin technology.