Plywood vs MDF vs Particleboard

The Forest Products Laboratory’s Wood Handbook describes plywood as a panel built from thin sheets of veneer in an odd number of layers, with the grain of adjacent layers oriented perpendicular to one another, and notes that the centre layer may be veneer, lumber, particleboard or fibreboard. That last point matters: the veneered panel sold as hardwood plywood may have a veneer core, an MDF core or a combination, and the face tells you nothing about which. Hardwood plywood, the handbook says, is normally used where appearance is more important than strength, and can be ordered with a solid core where internal voids would be a problem in small pieces.

Particleboard is made by mechanically reducing wood to particles, blending them with resin and pressing them dry into a panel. The handbook notes that it is typically made in layers, with fine particles at the faces and coarser material in the core, which gives a smooth surface for laminating, overlaying, painting or veneering. Since most applications are interior, it is usually bonded with urea-formaldehyde resin; the overall resin content usually runs between 6 and 9 percent by weight for UF resins, and wax is added at 0.3 to 1 percent of the ovendry particle weight to improve short-term moisture resistance. Particleboard used for quality furniture uses much smaller core particles, which gives a better edge and, in the handbook’s words, allows it to compete more favourably with MDF.

Medium-density fibreboard is made by refining wood into fibres rather than particles, which the handbook says exploits the fibrous nature of wood to a greater extent than particleboard does; it states directly that particleboard is generally not as strong as fibreboard for that reason. MDF is dry-pressed with UF or melamine-urea resin, and ANSI A208.2 classifies it by physical and mechanical properties and sets dimensional tolerances and formaldehyde emission limits. The handbook describes MDF as frequently used in place of solid wood, plywood and particleboard in furniture, and for interior door skins, mouldings and trim — the list of places it belongs in a cabinet.

The Forest Products Laboratory publishes a predictive equation for screw withdrawal from particleboard and fibreboard, and our cabinet box construction guide works it through: in inch-pound units the coefficient is 2,655 for the particleboard face and 2,055 for its edge, and 3,700 and 2,860 for fibreboard, the class that includes dry-process MDF. Two things follow. The edge is about 22 percent weaker than the face in both, which is the arithmetic reason a hinge plate or runner screwed into a frameless box edge is asking more of the panel than one screwed into its face. And MDF holds a screw roughly 39 percent better than particleboard at the same board specific gravity, which is not the ranking its reputation suggests.

Plywood is the honest omission. The handbook publishes no equivalent screw coefficient for it, so rather than infer one this guide reports what the handbook does say: nail withdrawal in plywood is 15 to 30 percent lower than in solid wood of the same thickness, and the alternating grain direction of its layers makes it resistant to splitting, allowing fasteners to be placed very near the edges of a panel. In a frameless box, where the runner and the hinge plate sit close to the front edge, that resistance to splitting is the property that matters most, and it is one neither fibre nor particle panel can offer. Our face frame versus frameless guide explains why the panel edge is the structural front of a frameless cabinet.

Weight ranks the panels in the opposite order from screw retention. The handbook classifies wood composites by density, and the dry-process fibre and particle panels sit above most veneer-core plywood; the practical experience is that a run of tall MDF or particleboard cabinets is meaningfully harder to carry, hang and shim than the same run in veneer-core plywood, and that a wall cabinet’s dead load is carried by its mounting rail into whatever the wall is made of. Weight also governs the door: our hardware engineering guide sets the hinge count for a door from height and weight together, and an MDF-core door reaches the next hinge sooner than a plywood-core one of the same size.

Veneer-core plywood belongs in the box: sides, tops, bottoms, backs and stretchers, where a screw must hold near an edge, where a leak is plausible, and where weight on a wall matters. It belongs in drawer sides for the same reasons, which our dovetail drawers spoke takes up. ANSI/AWI 0641-2019 requires pull-out shelves to be at least 19.1 millimetres thick and light valances the same, and a plywood shelf meets the deflection limits our box construction guide describes with less thickness than a particle panel would need.

MDF belongs where paint goes and water does not: door panels in painted stile-and-rail doors, painted slab doors and end panels, applied mouldings, and the fields of painted wainscot and built-in panelling. It can be a box material where the kitchen is dry and the run is short, but its weight and its edge behaviour in water are both reasons we do not make it the default box. As a veneer core it belongs in large slab doors and wall panels where flatness in raking light outranks weight.

Particleboard belongs where a laminate or melamine surface is the specification and the cost of plywood is not justified — garage, laundry and utility casework, and the interiors of some closet systems — and in furniture grades it is a legitimate shelf material within the deflection limit. It does not belong in a sink base, a dishwasher cabinet or a toe kick without the moisture-resistant specification the standard describes, and it does not belong behind a hinge plate on a frameless front edge if the kitchen is expected to last thirty years. The honest summary is the one the box construction guide gives: judge the box by its core, not by the white melamine on its inside.