These are not three grades of one product. They are three different ways of rebuilding wood, and each is good at exactly what its structure allows. Rank your three constraints and the choice makes itself.
"Which panel is best" has no answer, because the three are not competing versions of one product. They are three different ways of rebuilding wood from waste, and each one is good at exactly what its structure allows.
Everything downstream — strength, screw holding, moisture behaviour, surface, price — follows from those three structures. Choose by the job, not by the ranking.
| MDF | Plywood | Particle board | |
|---|---|---|---|
| Structure | Homogeneous fibre, no grain direction | Crossed veneer layers, grain alternates | Random chips, graded from fine face to coarse core |
| Density | roughly 600–800 kg/m³ | roughly 500–700 kg/m³, depends on species | roughly 600–750 kg/m³ |
| Load bearing | Moderate; sags over long spans | High for its weight; the crossed grain carries span | Low; not a structural panel |
| Screw holding, face | Good | Good | Moderate when new, weakens on re-driving |
| Screw holding, edge | Weak, splits near the edge | Good — the plies hold the thread | Poor; edges crumble |
| Water | Swells, does not recover. MR version resists humidity | WBP glue survives boiling; marine grades for permanent wet | Highest swell of the three, does not recover |
| Surface | Very flat and uniform — the best base for paint, foil and thin laminate | Wood grain shows through; needs a face veneer or film | Porous and uneven; always needs a face |
| Machining | Routes and profiles cleanly | Saws cleanly; edges need banding | Chips out; needs sharp tooling and slow feed |
| Weight per m³ | Medium | Lowest | Medium |
| Price | Mid | Highest | Lowest |
| Typical use | Cabinet doors, shop fitting, speakers, painted panels, CNC work | Formwork, flooring, structural sheathing, marine, transport | Flat-pack furniture, packaging, interior non-structural |
Deciding between the two fibreboards specifically? MDF vs HDF covers density bands, screw holding and what to write on the order.
Density ranges are the commercially common bands, not a specification. Plywood density moves a lot with the core species — poplar core sits near the bottom of the band, birch near the top — which is why "plywood" alone is not a specification either.
In practice a buyer is not optimising a panel, they are satisfying three constraints at once. Once you rank them, the answer picks itself.
If the panel is structural or spans more than about 600 mm unsupported, plywood is usually the only one of the three that works without a frame. MDF sags; particle board sags faster and does not come back.
None of the three is waterproof. Plywood with WBP glue is the only one that survives repeated wetting, and marine grades are specified where the wetting is permanent. For humid interiors, MR MDF or a moisture-resistant particle board will do. For a bathroom floor, none of them.
If it is painted, foiled or thin-laminated, MDF wins on flatness and holds the finish without telegraphing. If it needs a wood face, plywood gives you the substrate and the grain together. If it is going to be covered by a melamine face anyway, particle board is the cheapest way to get there.
Comparing price per sheet across these three is misleading, because a sheet is not a unit of usefulness.
The honest comparison is cost per finished square metre of the assembly, after facing, edge treatment and expected waste.
The three panels do not use the same amount of glue, and that shows up in formaldehyde results.
Particle board has the highest surface area per cubic metre, because the raw material is chips rather than fibre or veneer, so it needs the most resin to bond. Plywood uses phenol-formaldehyde for exterior grades, which is a different chemistry from the urea-based resins used in interior panels. MDF sits between them.
This is why the same emission class can be harder to reach in particle board than in MDF at a given price point — and why a cheap particle board quote claiming a top grade deserves a second look at the test report.
Most real orders use all three in one container. A typical furniture factory order is MDF for painted doors, particle board for carcasses that will be faced in melamine, and a small quantity of plywood for structural backing or drawer bottoms.
Sourcing those from three mills and consolidating them into one container is what we do. One loading date, one inspection, one set of export documents.