Plywood is made from thin wood veneers glued in alternating grain directions. The cross-graining gives it strength in both directions and much better screw holding at the edge than particleboard or MDF. Performance depends almost entirely on the adhesive used.
The adhesive decides everything
Three glue classes cover most cabinet plywood: interior (urea-formaldehyde, dry conditions only), moisture-resistant (MUF, occasional humidity) and exterior/WBP (phenolic, boil-proof). The board looks identical from the face; only the glue line and the label tell you which one you have.
For kitchen and laundry carcasses, moisture-resistant at minimum. For anything that could see standing water — sink bases, dishwasher housings — specify WBP and check the stamp, not the supplier's description.
| Class | Adhesive | Withstands | Use |
|---|---|---|---|
| Interior | UF | Dry conditions | Furniture, dry fit-out |
| Moisture-resistant | MUF | Occasional humidity | Kitchen and laundry carcasses |
| Exterior / WBP | Phenolic | Boiling water, weather | Sink bases, wet areas, external |
Where plywood earns its price
Sink and dishwasher housings, where a leak is likely and a swollen panel is expensive to replace. Also drawer boxes and any component that takes repeated load at a joint — plywood holds a screw at the edge in a way particleboard cannot.
It also resists racking better than a plain board box, which matters on wide units and on anything shipped flat and assembled on site.
Where it is money wasted
Standard carcass panels in a dry room. Plywood costs roughly 1.5–2× particleboard for the same thickness, and the extra strength is not used. A melamine-faced particleboard box performs the same job for less.
Painted door fronts. Plywood edges are hard to finish cleanly; the veneer layers telegraph through paint unless the edge is banded or lipped. Use MDF for painted doors.
Frequently asked questions
Is plywood better than particleboard for cabinets?
Stronger and more water-tolerant, but roughly 1.5–2× the price. It makes sense in wet or high-load locations, not as a default for every panel.
How do I know which glue class I am buying?
Ask for the stamp or the mill certificate. The face veneer looks the same across all classes; only the adhesive and the labelling differ.
Can plywood carcasses be melamine-faced?
Yes, but the facing is usually a separate laminate or veneer rather than a direct melamine press. That adds a process step and cost.
Does plywood warp?
Less than solid wood, more than particleboard if the plies are unbalanced. A balanced construction — odd number of plies, same species both faces — stays flat.
