Polyurethane glue
Polyurethane glue
Polyurethane (PU) glue is often a yellow glue that foams while it cures. It forms a very strong, water resistant bond. Can be used to fill holes and cracks because it expands a little bit. In addition to wood, PU sticks to a wide range of materials (e.g. paper, textile, metal, glass, plastic). The downside of PU glue is that it is a messy glue, stains are difficult to remove from wood and hands. It is also expensive compared to other wood glues such as PVA.
Polyurethanes are formed by combining a variety of chemicals. The most important ingredient is the family of isocyanates, that have not such a pretty environmental profile. Extensive exposure can cause skin irritation or allergies.
The life cycle |
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Con ![]() |
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High footprint The ingredients in polyurethane glue need polluting industrial processes to be produced, much more than wood glue and natural glues
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High energy The embodied energy of polyurethane glue is 4 times higher than wood glue.
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Quick Quick to apply and short curing time. |
Toxicity Polyurethane contains solvents and other toxic compounds, such as isocyanates, that will offgas during application.
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Costly Expensive compared to e.g. PVA glue.
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Difficult reuse It has a limited shelf life (not longer than 1 year).
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Bulky Glued wooden constructions are non disassemblable so they take more space, which increases energy use in transportation.
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Long lifespan Highly durable and water resistant. Very suitable for outdoor woodworking. Non toxic After curing it is chemically inert and safe (1) |
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Difficult recycling Polyurethane produces toxic gases when incinerated. It is classified as special waste in the EU.
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Links
Eco info
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Other Connections
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Examples on Harvestmap.org