Published 15 October 2026 · Updated 17 October 2026 · JIYU SDN BHD
IN SHORT
For cabinets, plywood thickness is chosen part by part: a thicker board for the carcass, shelves and doors that carry weight, and a thinner board for backs and drawer bases that only close the box. JIYU stocks 18mm (11 layers) and 6mm, and for any other thickness you should ask whether it can be ordered.
When a quotation says plywood, the thickness is easy to skip over, yet it decides how a shelf carries books, how firmly a hinge holds and how heavy the cabinet is to move. Different parts of one cabinet do not need the same thickness, and mixing them sensibly is part of good carpentry. This guide explains what each thickness is for and what to ask before you accept a specification.
Thickness affects three things: strength under load, how well screws and hinges hold, and how much the board resists bending over time. A shelf that spans a wide gap and carries heavy items needs more thickness than a panel that only closes the back. Thickness also affects the finish you see: a thicker edge looks more solid, and it gives the maker something to seal and trim cleanly. In Malaysia, the humid air adds a second reason. A board that is too thin for its span may sag or bow when humidity changes, and the doors then sit crooked. The point of choosing thickness is to give each part just enough board for its job, no more and no less, so the cabinet stays square and the carpentry stays sensible.
18mm is the working thickness for the parts that carry weight and take fixings. That includes the sides, tops and bottoms of the carcass, fixed and adjustable shelves, partitions, and door panels where the hinge cups are cut. JIYU's 18mm board is made of 11 layers in the 2440mm × 1220mm size, and that layered, cross-grained build is what gives a sheet its stability. For long shelves under heavy loads, thickness alone is not the whole answer: ask whether a rail, a divider or a shorter span has been planned, because even a good board will sag if it is asked to bridge too wide a gap. Edges of an 18mm board are wide enough to seal and to take edging cleanly, which matters near the sink.
6mm is the thin board for parts that close the cabinet rather than carry it. It suits the back panel, which keeps the carcass square and keeps dust out, and the base of a drawer, which sits in a groove cut into the drawer sides. A thinner back saves weight and leaves more internal space, and it is easier to cut openings in for cables or pipes. Because it is thin, a 6mm panel should not be asked to hold a shelf or a heavy hanging load, and it should be fixed and glued so it does its job of stiffening the box. JIYU's 6mm board is faced on one side with the colour or wood-grain pattern and a plain colour on the other, so the visible side should face where you will see it.
Some designs call for a thickness between the two, such as a slim door or a lightweight lid. JIYU currently stocks 18mm and 6mm only, so for any other thickness the honest answer is to ask whether it can be ordered rather than assume it is on the shelf. If a designer or builder specifies a different thickness, ask why: it may be for a visual reason, such as a thinner edge profile, or a structural one, and it may be possible to achieve the same result with a stocked thickness and a different edge detail. Changing thickness changes hinge selection, drawer runner clearance and the cut-outs for appliances, so settle it before production starts rather than during installation, when it is much harder to correct.
Put the thickness for each part in writing in the quotation or the drawing: carcass, shelves, doors, back and drawer bases. When the cabinet is delivered or installed, you can check an exposed edge with a caliper, or simply ask to see the edge before it is covered by the edging strip. If several parts look thinner than agreed, say so at once, because it is far easier to resolve before installation than after. Look at the back panel and the drawer bases as well, since those parts are easy to overlook. If you are buying sheets directly, check the sheet itself against the thickness on the order, and report any difference as soon as the pallet is opened.
What plywood thickness is best for kitchen cabinets?
A thicker board such as 18mm for the carcass, shelves and doors, and a thin board such as 6mm for the back and drawer bases. The right combination also depends on the span and the load, so give your builder the details.
Is 6mm plywood strong enough for a shelf?
It is meant for backs and drawer bases, not for shelves that carry weight. Use a thicker board for any shelf.
Does JIYU stock other plywood thicknesses?
JIYU stocks 18mm and 6mm. For any other thickness, ask us whether it can be ordered before you plan around it.
Can JIYU build the cabinets for me?
JIYU makes kitchen cabinets and wardrobes with its own plywood and installs them with its own team. Send us the layout and the list of parts, and we will quote on your specification. Plumbing, electrical and ceiling work are subcontracted, because JIYU is not a main renovation contractor.
How many sheets do you need?
Enter your cabinet size and get a cutting list plus an estimate of 18 mm and 6 mm sheets.
Open the plywood calculator →JIYU SDN BHD is an ENF-grade plywood supplier based in Puchong, Selangor, Malaysia. It also builds built-in cabinetry such as kitchen cabinets and wardrobes for homeowners and installs it with its own team.
Send us your cabinet drawing or the list of parts on WhatsApp, and we will quote on your specification. For the formaldehyde side, ENF grade is 0.025 mg/m³ or lower under GB/T 39600-2021, and our submitted sample measured 0.022 mg/m³ (report JC26-WT0087). Both thicknesses are in stock in Puchong, dispatch is within 3 days of an order (arrival depends on the courier), and the warranty is a 10-year limited warranty on manufacturing defects in the board (delamination, cracking not caused by external force, moisture blistering from a defect).
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