Cabinet Backs, Drawer Bottoms and Partitions: Panel Basics
Three parts decide how a cabinet feels in daily use, and none of them is the visible door: the back panel, the drawer bottom and the internal partition. Published thickness guidance for these parts runs at 6–9 mm for backs and bottoms, 12–15 mm for shelving and hotel fixtures, and 18 mm for worktops and structural panels. Get the band wrong and the fixing, not the finish, becomes the problem.
Key takeaways
- Match thickness to the part: 6–9 mm for backs, drawer bottoms and partitions, 12–15 mm for shelves and fixtures, 18 mm for worktops.
- Standardising on 12 mm and 18 mm is common practice among contractors because it reduces the number of press settings per order.
- Glue class is a room-by-room decision: MR suits dry interiors, while a boiling-water-resistant class covers humidity and light splash.
- Face veneer is not decoration only — birch, pine, bleached poplar and eucalyptus take stain and laminate differently.
Thickness bands that map to real cabinet parts
Start with function rather than with the catalogue. A back panel carries almost no load, so a 6–9 mm sheet does the job while keeping the carcass light and the rebate shallow. A drawer bottom of the same band survives daily sliding when the glue class is right. Partitions and internal dividers sit in the middle because they take shelf load through their edges, which is why 12–15 mm is the usual answer for office furniture and hotel fixtures.
The top of the band belongs to worktops and structural panels, where 18 mm is the sensible default. Cutting a 100 mm wide worktop from 12 mm stock to save weight rarely ends well; the span between supports is what decides the thickness, and it is worth writing that span into the order rather than arguing about it later.
| Part | Typical thickness | What it has to survive |
|---|---|---|
| Cabinet back | 6–9 mm | Dust sealing and squareness of the carcass |
| Drawer bottom | 6–9 mm | Repeated sliding under a loaded drawer |
| Internal partition | 12–15 mm | Shelf load transferred through panel edges |
| Office shelving | 12–15 mm | Span between brackets and fixed supports |
| Worktop and structural panel | 18 mm | Point loads, fixings and unsupported spans |
Cores: the layer nobody sees and everybody feels
Four core options are named across the range, and the difference shows up in weight, screw-holding and how the panel behaves after a season in a heated room. The catalogue is described as furniture plywood, hardwood plywood and veneer plywood, and the core is the part that separates those families in practice. Acacia Core brings hardwood density and load-bearing capacity. Bodhi Core, a white hardwood core, is chosen for balanced mechanical strength at a practical cost. Eucalyptus Core is the densest of the group, with compression resistance and bending performance for heavier assemblies. Combi Core combines eucalyptus and acacia, or hardwood with softwood, balancing strength, weight and cost in one build-up.
For kitchen and bathroom carcasses, the core matters less than the glue and the edge treatment, because moisture arrives at the joints first. For long shelving runs and heavy worktops, it matters most, and asking for a core by name is the simplest way to fix a price that otherwise drifts between quotations.
Glue classes for kitchens, bathrooms and bedrooms
Adhesive choice is a room-by-room decision. MR (moisture resistant) covers dry interiors — bedrooms, living rooms, office desks — where humidity stays moderate and spills are wiped up. Where a panel sits near a sink, a shower wall or a laundry appliance, the specification should move up to a boiling-water-resistant class, and the same reasoning applies to any part that will be exposed during building work before the interior is closed in.
The catalogue carries E0, E1, E2, MR, WBP and Phenolic Dynea classes, and emission-based grades such as E0 and E1 sit on a different axis from moisture resistance: one describes what the panel emits indoors, the other what happens to the bond when water reaches it. Both belong on the specification sheet, and neither replaces the other.
Worked example: how many cabinet backs come out of one sheet
Cutting plans are where thickness decisions turn into money. Take a standard 1220 × 2440 mm sheet: 2.98 m² (1.22 × 2.44 m) of panel. A cabinet back of 600 × 800 mm takes 0.6 m × 0.8 m = 0.48 m², so one sheet yields 2.98 ÷ 0.48 = 6.2, which in practice means six backs per sheet once saw kerf and trimming are accounted for.
Scale that to a contract of 2,400 cabinets: 2,400 ÷ 6 = 400 sheets of 6–9 mm panel, or 400 × 2.98 m² = 1,192 m² of board. Running the same sum on a larger format shows the trade-off. The 1250 × 2500 mm panel is 3.125 m² (1.25 × 2.5 m), which raises the yield to roughly six and a half backs per sheet — useful arithmetic when a workshop is trying to reduce handling rather than board cost.
Why European buyers ask about duty and origin
By the time a furniture programme reaches a European retailer, the panel has usually been cut, edged, assembled and packed by two or three companies, and the origin of the board is claimed at the point of import. That is why the duty position is asked for early. Panels sourced from Vietnam are marketed with No Anti-Dumping Tax for EU and US destinations, which changes the landed cost of every cabinet that shares the same consignment.
Origin claims also reach the customer. Retail groups increasingly want to know which mill pressed the board and which species went into the core, and a supplier that can answer with a mill name, a size in millimetres and a core description keeps that conversation short.
Face veneer and grade: what the customer actually sees
The range itself is sold as a furniture-grade Commercial Plywood line covering cabinets, construction, packing and flooring, and the build can be adjusted by size, core structure, glue class, face veneer and grade. Birch, pine, bleached poplar, EV and rose eucalyptus are the faces named across it, and they behave differently under the same finishing schedule. Birch takes stain evenly and laminates cleanly, pine shows more colour movement, bleached poplar gives a pale base for painted doors, and eucalyptus brings a light warm tone that suits clear sealers. Samples should always be finished the way the customer will finish them, because a raw veneer swatch says little about the assembled door.
Grade sits beside veneer choice. Face grade decides how much natural variation reaches the customer's eye, so a hotel contract and a flat-pack line rarely accept the same grade even when they buy the same thickness, core and glue class.
Frequently asked questions
Can a 9 mm panel carry shelf loads?
Only over short spans, and it is normally kept for backs, bottoms and partitions. Shelving and office furniture are usually specified at 12–15 mm, and worktops at 18 mm, because the span between supports rather than the panel's surface decides how much load a shelf can hold.
Does the core make a difference once a panel is laminated?
It makes a difference to the joints and the fixings, which is where failures appear. A denser core such as eucalyptus or acacia holds screws better and resists compression at the edges, while a combi build-up trades some of that density for lower weight and a lower board cost.
Is the same panel used for kitchen cabinets and bedroom wardrobes?
Not usually with the same glue class. Dry interiors are covered by an MR bond, while kitchens, bathrooms and laundry areas are normally specified with a boiling-water-resistant class. Thickness and face grade may well be identical in both rooms.
Building a mixed order without over-specifying
The most common cost mistake in a furniture programme is buying one thickness for everything: 18 mm backs waste money and add weight, while 9 mm worktops create callbacks. Write the order as a short parts list with thickness, core, glue class and face grade on each line. Workshops that already run both product families together should look at the factory profile behind the range, and teams specifying light-coloured doors for export often price the birch-faced panel option alongside the standard commercial face veneers.
Thickness bands, core names and glue classes used above were verified on the manufacturer's site, which I read on 29 September 2026 for the data in this guide for the data in this guide as the basis for this comparison, and the cutting sums are shown as worked examples[1].