What happen to a particle board when it gets wet for several days?

Answer 1

The short answer is that it will absorb water, the glue will break down and the fibres will break apart and the material will swell and lose its structural integrity and strength. It will be softer and can literally disintegrate depending on how much water is absorbed and for how long.

Particle board is basically sawdust mixed with glue and compressed into a flat sheet. There are a couple of different qualities based on what type of process going into the production of the material. If a water resistant glue is used, the material is far more water resistant than if a non resistant glue is used. Also if a high quality laminate or coating is bonded to the surface of the material again it is more resistant to water penetration.

The above is important background information to have to understand what will happen if particle board gets wet. Particle board is basically a sponge that will absorb water. The speed that it absorbs is affected by the quality of glue impregnating the material and the coating and the amount of water exposure so the long answer is there may be little damage or there may be a lot because of the above information.