What makes glue harden

What drying time has which wood glue?

Drying time depending on the wood glue

If you want to get a standard white glue in the building trade, you will come across several different types. Above all, a distinction is made between stress groups D2 to D4 and various application requirements.

In the case of the stress groups, the main concern is the moisture resistance of the glue. And this is also relevant for the respective dry season. The drying time is basically dependent on many different influencing factors. The moisture resistance of the adhesive makes it relatively clearly quantifiable and is always specified in the processing instructions for the products.

Setting time is essential

To compare drying times, we are first talking about the setting time, i.e. the time until the glue has changed from a liquid to a solid state. The so-called final strength - i.e. the time that the glued wood needs to absorb the moisture from the glue and then release it back into the environment. This usually takes 3 to 7 days. The setting time is usually not specified directly in the processing instructions for the wood glue (4.49 € on Amazon *) e, but usually coincides with the pressing time that is always specified.

With average processing conditions - i.e. an ambient temperature of around 20 ° C and a wood moisture content between 8 and 12% - the following setting times result:

  • Standard white glue (D2 Classic glue): approx. 15 to 20 minutes
  • White glue as an express variant (D1): approx. 8 to 10 minutes
  • Waterproof white glue (D3): approx. 15 to 20 minutes
  • D4 hardener for outdoor use: 15 to 20 minutes
  • Lacquer glue: at least 30 minutes

Other factors influencing the dry season

As already explained above, in addition to the composition of the glue itself, moisture is the most important factor influencing the drying time. And that of the environment and the wood. If it is significantly above or below the average (humidity around 50%, processing wood around 10%), the drying time also changes noticeably.

Ambient temperature

The ambient temperature is directly related to the ambient humidity, because the air can absorb different moisture depending on the temperature. At low temperatures - for example when doing DIY in a cool hobby room - the drying time of wood gluing is delayed due to the low relative humidity capacity of the air.

Layer thickness of the glue

In addition, how thick you apply the glue is also decisive. The thicker the layer, the longer the glue takes to dry. Basically, it should always be applied as thinly as possible.

Texture of the wood

Then the texture and fiber structure of the processing wood also play a role. The coarser its pore structure, the more moisture-absorbing it is. Coarse-pored and low-content woods therefore shorten the drying time of the glue, fine-pored and high-content woods - especially tropical woods such as teak - lengthen it. Treatments with varnish also reduce the absorption capacity of the wood enormously and thus increase the drying time of the glue.

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Article image: Vadim Orlov / Shutterstock
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