What Your Kitchen Cabinets Are Actually Made Of
By Parham Shariat ·
Most people choose cabinets by door style and color. That makes sense, because the doors are what you see every day. But the box behind the door decides how the cabinet handles water, weight and years of daily use.
This guide covers the four boards that cabinets are built from, the finishes that go over them, and the questions worth asking before you sign anything. You do not need to be a builder to follow it.
The four core materials
Particle board
Particle board is made from wood chips pressed together with resin. It is one of the most common materials for cabinet boxes, wardrobes and closet systems, and it is usually covered in melamine.
The spec sheets we reviewed list it in 12mm, 18mm and 25mm thicknesses, with good screw holding capacity and an E1 formaldehyde rating. It works well in dry rooms and for interiors. Its weak spot is water. Standing moisture and unsealed cut edges are where it fails first, so think carefully before using it under a sink.
MDF (medium density fiberboard)
MDF is made from fine wood fibers pressed under heat and pressure. It has no grain and no knots, so the surface is smooth and even. That is why it is the usual choice for painted doors, and for shaped or arched doors that need to be routed or curved.
It comes in 5mm, 9mm, 12mm, 18mm and 25mm thicknesses, carries an E1 rating, and has strong bearing capacity. It can take melamine, lacquer, wood veneer, PET and HPL finishes. MDF is typically used for doors and wardrobe parts rather than the main cabinet box.
Plywood
Plywood is built from thin layers of wood glued together with the grain running in alternating directions. The version we looked at is a 7-layer solid wood sheet, available in 12mm, 18mm and 25mm, with an E0 rating and strong screw holding.
It is used for cabinet boxes and wardrobes, and it accepts melamine, wood veneer, HPL and PET surfaces. Of the four materials, plywood is generally the most forgiving around moisture, which is why it is a smart pick for sink bases and bathroom vanities.
OSB (oriented strand board)
OSB starts as a particle board and adds long wood strands laid in set directions to improve resistance to bending. The listed specs are an E0 rating, strong screw holding capacity and thicknesses of 18mm and 25mm.
It is used for cabinet boxes, wardrobes and doors, finished in melamine or PET. OSB is more familiar in construction than in American cabinet shops, so if you see it on a quote, ask the maker why it was chosen.
At a glance
| Material | What it is | Formaldehyde grade | Thickness | Common use | Surface options |
|---|---|---|---|---|---|
| Particle board | Wood chips pressed with resin | E1 | 12mm, 18mm, 25mm | Cabinet box, wardrobe, door | Melamine |
| MDF | Fine wood fibers, heat and pressure | E1 | 5mm, 9mm, 12mm, 18mm, 25mm | Wardrobe, door | Melamine, lacquer, wood veneer, PET, HPL |
| Plywood | Layered wood sheets, alternating grain | E0 | 12mm, 18mm, 25mm | Cabinet box, wardrobe | Melamine, wood veneer, HPL, PET |
| OSB | Directional wood strands, pressed | E0 | 18mm, 25mm | Cabinet box, wardrobe, door | Melamine, PET |
What E0 and E1 mean
You will see E0 and E1 on many cabinet spec sheets. They are formaldehyde emission grades. Lower numbers mean lower emissions from the board.
- E0 means emissions of 0.5 mg/L or less.
- E1 means emissions of 1.5 mg/L or less.
These grades come from international standards. In the United States, particle board, MDF and hardwood plywood sold for cabinets fall under the California CARB Phase 2 and federal EPA TSCA Title VI rules, and compliant panels are labeled. The numbers do not convert one to one, so do not assume E0 or E1 equals a US label. Ask to see the compliance label on the actual panels.
The finish on top
The surface protects the board and sets the look. Here are the five options you will run into.
- Melamine. A resin-coated paper fused to the board. Durable, easy to wipe down, and widely used for cabinet interiors.
- Lacquer. A sprayed paint finish. It gives a smooth, even color and works especially well on MDF doors.
- Wood veneer. A thin slice of real wood glued to the board. You get real grain without the cost of solid wood.
- PET. A durable film applied to the surface, common on modern flat-panel doors in matte or gloss.
- HPL (high pressure laminate). A hard laminate surface, tough against scratches and wear.
Not every finish goes on every board. Particle board is paired with melamine. OSB takes melamine or PET. Plywood takes melamine, wood veneer, HPL or PET. MDF is the most flexible and accepts all five.
How to choose
- Sink bases and bathroom vanities: moisture is the main enemy. Lean toward plywood, and make sure cut edges are sealed.
- Painted or shaped doors: MDF gives the smoothest surface and holds a profile well.
- Closets, laundry rooms and dry storage: particle board with a melamine surface does the job at a sensible cost.
- Heavy loads such as pantry shelves and drawer boxes: look at thickness first. An 18mm or 25mm panel carries far more than a thinner one.
The right answer depends on the room, the budget and how hard the cabinets will be used. A good cabinet often combines materials, with a sturdy box and a finish suited to the door style.
Questions to ask before you buy
- What are the cabinet boxes made of, and how thick are the panels?
- What are the doors made of, and what is the finish?
- Do the panels carry a CARB Phase 2 or TSCA Title VI label?
- Are the cut edges sealed, especially in the sink base?
- Are the shelves and drawer boxes the same material as the box?
A straight answer to these five tells you most of what you need to know.
Frequently asked questions
Is plywood always better than particle board?
No. Plywood handles moisture better and is a strong choice for sink areas. Particle board with a melamine surface performs well in dry spaces and often costs less. The best choice depends on where the cabinet lives.
Why is MDF used for painted doors?
MDF has a smooth, uniform surface with no grain, so paint and lacquer go on evenly. It also takes shaping well, which makes it suitable for profiled and arched doors.
What does melamine mean?
Melamine is a durable resin-coated surface fused to a board. It resists wear and wipes clean, which is why it is common inside cabinets.
Are E0 and E1 boards safe?
Both grades are low-emission classifications, with E0 being the lower of the two. For cabinets sold in the US, ask for the CARB Phase 2 or TSCA Title VI label so you know the panels meet American requirements.
How thick should my cabinet panels be?
The materials above are commonly offered in 12mm, 18mm and 25mm. Thicker panels carry more weight, so ask about thickness for shelves and larger spans.
Talk it through with us
If you are planning a kitchen, bath or closet, come see the materials in person. Bring your measurements and photos, and we will walk through the options with you.
US Floor Design Center, 30092 Santa Margarita Pkwy, Rancho Santa Margarita, CA 92688. Phone: (949) 589-9226.
Hours: Monday to Friday 9am to 5pm, Saturday 9am to 4pm, Sunday 10am to 3pm.