What is HDF?
The Wood Guide · The wood register
The heaviest fibreboardWhat is HDF?
High Density Fibreboard: the same wood fibre as MDF, but pressed more densely. Heavier, stronger and more stable — which is why it sits under your laminate floor.
- 30–40% heavier than MDF
- Up to 50% stronger
- Made from wood residues
HDF in brief
HDF is essentially MDF that has been pressed further. The same fine wood fibre, but at a higher density — and that changes everything about what you can do with it.
The extra density makes the board noticeably heavier and considerably stronger. Where MDF is the standard for lacquered furniture fronts, HDF goes where real loads are applied: the core of a laminate floor, door panels, or places where mass is wanted for sound insulation.
Like MDF and chipboard, HDF is made from sawdust and wood chips left over from timber processing. At the end of its life it can also be recycled.
- What
- wood fibre + resin, pressed at high pressure
- Weight
- ±30–40% heavier than MDF
- Strength
- up to 50% stronger than MDF
- Surface
- very smooth and uniform
- Moisture
- more moisture-resistant than MDF, not waterproof
To be fair: the weight is no minor detail. Large HDF sheets are barely manageable even for two people.
It starts with sawdust and chips
Like MDF and chipboard, HDF is made from residues of timber processing. They are ground mechanically into fine fibres.
Click a chapter or use the arrows · fibres greatly enlarged, proportions simplified.
How HDF is made
- Extracting the fibresWood residues such as sawdust and chips are mechanically ground into fine fibres.
- Mixing with resinThe fibres are mixed with resins and adhesives into a homogeneous mass.
- High-pressure pressingUnder high pressure and temperature the mass is pressed into dense, rigid boards — this is where it differs from MDF.
- FinishingThe boards cool, are cut and sanded to a smooth, uniform surface.
The advantages of HDF
High density and strength
Withstands heavy loads — which is why it is used as a core material for floors.
Smooth surface
The uniform surface is ideal for painting, lacquering and veneering, with nothing showing through.
Stability
Does not easily distort or warp, even with changing temperature and humidity.
Easy to work
Cutting, sawing, drilling and sanding with standard woodworking tools.
Where HDF belongs
Laminate flooring
As a core material, precisely because of its combination of strength and stability. Probably the place where you come across HDF most often without knowing it.
Furniture making
Cabinets, tables and chairs — the smooth surface lends itself to painting or veneering. See our interior range.
Door panels
A smooth surface that is easy to finish, with enough rigidity for everyday use.
Interiors
Wall panels, partition walls and ceilings.
Sound insulation
Thanks to its density and mass, HDF is also used where sound needs to be blocked.
Working and finishing
HDF is easy to work, but its high density calls for care on three points.
- Sharp bladesCutting and sawing can be done with standard tools, but use sharp blades to limit splintering — at this density, tools wear faster.
- Support the edgesWhen nailing, screwing or gluing, support the edges well, or the board will splinter at the edge.
- Sand lightly before finishingA light sanding gives the smoothest result; then paint, lacquer or veneer as you prefer.
As with MDF and chipboard, fine dust is released that may contain resins. Work with ventilation and dust extraction, and wear a dust mask.
Frequently asked questions about HDF
What is the difference between HDF and MDF?
HDF has a higher density: roughly 30–40% heavier than MDF and up to 50% stronger. That makes it better suited to more heavily loaded applications, such as the core of laminate flooring.
Is HDF water-resistant?
Standard HDF is not. It is, however, more moisture-resistant and more stable than MDF when exposed to moisture, and special water-resistant versions exist for damp rooms.
Can HDF be painted or veneered?
Yes. The smooth, uniform surface is excellent for painting, lacquering and veneering. Sand it lightly first for the best result.
Why is HDF used in laminate flooring?
Because of its combination of density and stability: the board carries the load of everyday use without distorting, even with changing temperature and humidity.
Is HDF recyclable?
Yes. HDF is made from wood waste and residues, and can be reprocessed at the end of its life — an advantage over materials that cannot.
The whole board family
MDF, HDF and chipboard look alike but each does something different. The register also covers solid wood.
Have a question about your project? Just ask — we're happy to help.
Photos via Wikimedia Commons: Thin 3.4 mm hardboard panel with a smooth face — Holger.Ellgaard, CC BY-SA 3.0 · Back of a hardboard panel with its typical mesh texture — Holger.Ellgaard, CC BY-SA 3.0