{"id":8797,"date":"2021-02-05T18:36:07","date_gmt":"2021-02-05T18:36:07","guid":{"rendered":"https:\/\/resin-expert.com\/?p=8797"},"modified":"2023-04-06T13:13:26","modified_gmt":"2023-04-06T13:13:26","slug":"best-wood-glue","status":"publish","type":"post","link":"https:\/\/resin-expert.com\/en\/guide\/best-wood-glue","title":{"rendered":"Best Wood Glue – A Guide on the Best and Strongest Wood Glue"},"content":{"rendered":"

Wood is not one of the most popular materials for nothing, because it has a variety of positive properties. However, it also has some disadvantages, which can affect its level of adhesion. In our wood guide, you will learn how you can use glue for wood and what the best wood glue is for this purpose.<\/strong><\/p>\n

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Properties of Wood<\/h2>\n

If you want to combine wood and glue, you need to consider some basic things, because not all wood is the same. There are a large number of different woods, which are distinguished not only on the basis of their hardness – soft and hard – but also on the basis of their color or possibly existing resin ducts. Furthermore, there are solid woods as well as heartwood, chipboard, or sapwood. A distinction is also made between swelling and porous woods.<\/p>\n

But that is not all, because the properties of the respective wood can even vary depending on humidity, temperature, and other environmental conditions. It expands and contracts, where the wood is said to “work”. This working can lead to the glued seam being damaged over time and, in the worst case, cracking if the adhesive is not suitable.<\/p>\n

\"Glue<\/p>\n

Furthermore, a good wood adhesive must also be able to bond different materials together, such as when different coefficients of thermal expansion are present.\u00a0A good wood glue must take all of these properties into account, because it must provide sufficient adhesive force without causing the wood to swell or be absorbed by it.<\/p>\n

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Overview of Different Stress Groups<\/h2>\n

To join wood permanently and with high strength, the adhesive must have the optimum properties for the particular bonded joint. For this reason, wood adhesives are divided into four different stress groups. The higher the class designation, the more weather-resistant the respective wood glue is.<\/p>\n

So, if you want to glue wood, you should definitely pay attention to the stress group, because otherwise it could happen that the glued seam comes loose again in unfavorable weather conditions outdoors. In principle, any stress group is suitable for indoor use, while only stress group D4 is suitable for a really strong bond outdoors.<\/p>\n

For outdoor use, you should also pay attention to the temperature resistance of the wood glue. It is advisable to use a white glue that can also compensate for larger temperature differences and direct sunlight.<\/p>\n

The classes D1 to D4 are used for the stresses, as shown in the following table.<\/strong><\/span><\/p><\/blockquote>\n

 <\/p>\n\n\n\n\n\n\n\n
Classification<\/strong><\/td>\nFeatures<\/strong><\/td>\n<\/tr>\n
Stress Group D1<\/td>\n\n
    \n
  • Referred to as “dry strength”<\/li>\n
  • For a very low load of stress<\/li>\n
  • Only suitable for indoor use<\/li>\n
  • Residual moisture of the wood must not exceed 15%<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
Stress Group D2<\/td>\n\n
    \n
  • Referred to as “moisture-resistant”<\/li>\n
  • Only suitable for indoor use<\/li>\n
  • Very brief contact with moisture allowed<\/li>\n
  • Residual moisture of the wood must not exceed 18%<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
Stress Group D3<\/td>\n\n
    \n
  • Referred to as “cold water-resistant”<\/li>\n
  • For indoor use, but also suitable for wet rooms<\/li>\n
  • Also for outdoor use, but only for weather-protected use<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
Stress Group D4<\/td>\n\n
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  • Referred to as “damp water-resistant”<\/li>\n
  • Developed for the very highest demands<\/li>\n
  • High and prolonged humidity does not pose a problem<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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    Different Types of Glue for Wood<\/h2>\n

    There are different types of wood glue on the market and not all of them are suitable for every application. As already explained, there are those for indoor use as well as those for outdoor use. But other criteria are also important if you want to glue wood.<\/p>\n

    For example, wood glues with natural ingredients are distinguished from those that contain synthetic substances. Natural wood glues are:

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    • <\/i> Glutin glue<\/strong>, which contains animal waste materials such as bones, but is now only used in exceptional cases.<\/li>\n
    • <\/i> Casein glue<\/strong>, which\u00a0consists of casein, a milk protein, and is produced in combination with calcium hydroxide, i.e., slaked lime<\/div><\/li>\n<\/ul>\n

      Compared to glutin glue, casein glue has the advantage of heat resistance. It is also water-resistant. However, it is rarely used by do-it-yourselfers, but rather by carpenters.<\/p>\n

      The wood glues mentioned here are not only environmentally friendly because they are made of natural materials, but some of them are also food-safe. However, the selection of natural glues is small and they are more suitable for professional crafts than for home use. Therefore, they are also not available in every market.<\/p>\n

      \"Best<\/p>\n

      Wood glues with synthetic ingredients, on the other hand, are usually dispersion adhesives that are free of solvents as well as formaldehyde. However, formaldehyde glues are also available, as well as polyurethane glues and epoxy resin adhesives. White glue is one of the best known synthetic wood glues.<\/p>\n

      Synthetic wood glues thus have several advantages. For example, they offer a wide portfolio of possibilities and securely bond many different materials together. They can also withstand high loads, although, of course, attention should be paid to the classification from D1 to D4. In addition, a wide variety of these wood glues is available on the market.<\/p>\n

      A major disadvantage is the that of the chemical ingredients, some of which can also be responsible for the strong odor as well as potential adverse health effects. Safety equipment should therefore always be worn when working with synthetic adhesives.<\/strong><\/span><\/p><\/blockquote>\n

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      PVA Wood Glue (White Glue)<\/h3>\n

      The name white glue says it all, because before the curing phase it has a milky white color; however, it cures transparently. This results in a highly inconspicuous glue line.\u00a0White glue does not need to be thinned or specially mixed, although it can be mixed with crosslinkers or curing agents. Caution is advised with hardwoods as well as tropical woods, as these often contain a lot of resin and\/or oil. These substances can impair the bonding performance of the white glue.<\/p>\n

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      PROS<\/strong><\/span><\/p>\n

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      • <\/i> Formaldehyde-free and therefore odorless
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      • <\/i> Cures\u00a0transparently, making it inconspicuous
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      • <\/i> Fast curing at room temperature
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      • <\/i> Glue for wood forms a strong bond<\/strong><\/li>\n<\/ul>\n<\/div>\n<\/div><\/div>
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        CONS<\/strong><\/span><\/p>\n

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        • <\/i> Most are not food-safe
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        • <\/i> Some types of PVA wood glue are not waterproof
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        • <\/i> Not suitable for tropical woods or hardwoods<\/strong><\/li>\n<\/ul>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>\n

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          Recommendation: ELMER’S Carpenter’s Wood Glue<\/h4>\n

          Elmer’s PVA wood glue boasts a bond that is stronger than wood itself. This white glue is non-toxic and produces no harmful fumes. It is also easy to clean up with some water. This is one of the strongest wood glue options, as it is resistant to heat, water, mold, and mildew, and can be used both outside and inside. You can also paint, stain, and sand the adhesive once it has cured.<\/p>\n