Medium-Density Fibreboard (MDF)

Medium-Density Fibreboard (MDF) is the workhorse engineered timber panel for cabinetmaking, shop fitting, signage substrate, display construction and CNC-routed letterwork. It is smooth, dense, dimensionally uniform and machines to a clean edge that paints and laminates well. P&M Plastics CNC-routes MDF to client artwork files for sign makers, shop fit-out contractors and exhibition builders across the Gold Coast and Brisbane .

Sizes and formats we stock

Standard MDF is stocked in 3mm, 6mm, 9mm, 12mm, 16mm, 18mm and 25mm in standard 2400 x 1200mm sheet. The 12mm and 18mm grades are the workhorses for cabinetry and signage; thinner grades (3mm and 6mm) are used for backings, drawer bottoms and laminated panels. We also stock moisture-resistant MR-MDF for kitchen and bathroom applications.

Colours and grades

Natural MDF (light tan) is the standard. Coloured, dyed-through MDF such as Valchromat is available on indent in colours including black, white, grey, blue and red for high-end signage and decorative panels; ask us for current colours and lead time. Moisture-resistant MR-MDF (typically green-tinted) is stocked for splashbacks and bathroom cabinetry. Fire-rated FR-MDF is available on order for compliant commercial work.

Plain (standard) MDF vs coloured (Valchromat) MDF

Standard MDF and coloured, dyed-through MDF such as Valchromat look similar on the face but behave very differently once you cut into them. The difference comes down to one thing: plain MDF is coloured only on the surface, while coloured MDF is dyed all the way through. Here is how they compare.

• Colour depth: plain MDF has a natural brown-tan core with colour only where you paint or laminate it; coloured MDF is dyed right through, so the colour is the board itself.
• Cut and routed edges: plain MDF shows the raw core on every cut edge and needs edge-banding, filling or paint to finish; coloured MDF shows the same colour on the edge as the face, finished straight off the saw.
• Machining and engraving: cutting into plain MDF exposes the pale core; routing or engraving coloured MDF reveals more of the same colour, which is why it suits V-carved, engraved and routed detail.
• Binder and moisture: standard MDF uses a standard binder with low moisture resistance, MR grades aside; many coloured, dyed-through boards use a modified, more moisture-tolerant binder, though neither is waterproof.
• Finish and feel: plain MDF is smooth and paint-ready; coloured MDF has a slightly matte, through-colour surface that also takes oil or wax well.
• Typical use: plain MDF suits painted or laminated cabinetry, substrate, shop fitting and jigs; coloured MDF suits exposed-edge furniture, retail and display, signage and decorative or acoustic panels.
• Relative cost: plain MDF is the economical everyday board; coloured MDF is a premium product, typically two to four times the price.

When to use plain vs coloured MDF

• Choose plain (standard) MDF when the panel will be painted, laminated or hidden, or when budget matters and the cut edges will not be on show. It is the right board for the large majority of cabinetry and signage substrate work.
• Choose coloured (Valchromat) MDF when cut, routed or engraved edges are exposed and you want them finished without edge-banding or paint, such as retail displays, designer furniture, signage returns and acoustic slat panels. This is where we CNC-rout coloured MDF so the machined edge reads as a finished, coloured detail.

Whichever you choose, remember that neither plain nor coloured MDF is waterproof or structural, and neither is suitable for outdoor use. Match the grade to the job, and seal or finish any edge that will see moisture.

MDF compared to plywood

MDF is denser and more dimensionally uniform than plywood , has no grain to chase and machines to a flawless edge ready for paint or laminate. Plywood is lighter, stiffer per kilogram and far stronger across the panel, which is why structural shelving, jigs and load-bearing work goes in plywood. For signage, cabinetry doors, drawer fronts and decorative panels, MDF is the right pick. For shelving, structural builds and any panel that needs to take real load, choose plywood.

Why P&M Plastics for MDF work

We CNC-route MDF to client artwork files for dimensional signage, free-standing letters, shop fit-out panels, exhibition stands and bespoke cabinet doors. Our CNC produces machined edges ready for paint or laminate; we also V-groove for folded signage and edge-profile for finished decorative work. For shop-fit clients we run high-volume cabinet door batches with consistent edge quality.