Wood is a living material that constantly seeks balance with ambient humidity. Its moisture content is one of the most important factors in bond quality.
The ideal range
For furniture and interior applications, 8–12% moisture content is generally ideal. In this range, dispersions dry properly and moisture-curing systems find enough moisture.
Wood that is too wet
- The dispersion's water cannot be absorbed and press time grows.
- After drying, shrinkage stresses and cracks the joint.
- Glue lines and stains may appear on the surface.
Wood that is too dry
- The wood absorbs the adhesive's water too quickly, leaving a starved joint.
- Open time shortens and wetting is insufficient.
- Curing of moisture-curing systems such as PUR can slow down.
| Moisture content | Likely issue |
|---|---|
| Below 6% | Starved joint, rapid absorption |
| 8–12% | Ideal |
| Above 15% | Long press time, shrinkage cracks |
Measuring and conditioning
- Take readings at several points with a pin or capacitive moisture meter.
- Condition material in the production area, in conditions similar to where it will be used.
- The moisture difference between parts being joined should not exceed 2–3%.
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