Guides / Specification
Packing Plywood: The Cheapest Grade, Specified Properly
September 21, 2026
Packing plywood is the bottom of the plywood range and the easiest place to lose money twice: once by paying for quality the crate does not need, and once by buying a panel so thin it splits at the first nail.
What it is
Utility plywood pressed from mixed plantation hardwood, usually with an unsanded or lightly sanded face, in the 5 to 18 mm range. It goes into export crates, machinery cases, pallet decks, box sides and one way packaging.
Nobody looks at it. Nobody finishes it. It has to hold a nail, survive a forklift and arrive dry.
The lines that still matter
Even at the cheapest grade, four things decide whether the crate works:
- Bond. MR glue is normal here. If the crate sits on a dock in the rain or crosses the tropics in a non ventilated box, ask for melamine or phenolic instead. See MR, melamine or WBP
- Actual thickness. A nominal 9 mm panel arriving at 8.1 mm loses a tenth of its stiffness and all of its nail holding at the edge. Order to actual thickness, as described in plywood sizes and thickness tolerance
- Core gaps. A hollow spot under a nail line is where the wall splits. Utility face is fine, hollow core is not
- Moisture content. Panels shipped wet warp inside the crate and the crate stops closing
ISPM 15, and the half that buyers get wrong
ISPM 15 is the international rule on wood packaging that carries pest risk. It requires heat treatment or fumigation and the stamped mark.
Plywood and other processed wood based panels sit outside it, because the manufacturing process already removes the risk. What does fall inside it is the solid wood in the same crate: the skids, runners, battens, blocks and any sawn timber frame.
So the correct instruction to a crate maker is not “ISPM 15 plywood”. It is “ISPM 15 treated and marked solid wood components, plywood panels as specified”. Getting that right avoids paying a mill for a treatment its product does not need, and avoids a crate stopped at a border because the skids were untreated.
Check the current requirement for your destination country with your forwarder, because national implementations differ.
Sizing the panel to the job
| Use | Typical thickness | Watch for |
|---|---|---|
| Box sides, light crates | 5 to 9 mm | Nail holding at the edge, actual thickness |
| Machinery cases | 12 to 15 mm | Core gaps, bond if the route is humid |
| Pallet deck boards | 12 to 18 mm | Density and ply count, forklift entry damage |
| Heavy or reused crates | 15 to 18 mm, denser core | Repeated handling, screw holding |
Buying it well
Packing plywood is a volume product, which means the price is thin and the freight matters. Two habits pay off:
- Order in full container loads. Part loads carry a premium that wipes out the saving on the grade
- Give the mill the end use, not just the thickness. A mill that knows the panel becomes a pallet deck will quote a different core than one that assumes box sides, and the second one is cheaper for the wrong reason
The weight side of the loading plan is in plywood weight per sheet.
Frequently asked questions
Does packing plywood need ISPM 15 treatment?
The plywood panels themselves sit outside ISPM 15, because the manufacturing process already removes the pest risk. The solid wood parts of the crate, the skids, battens and blocks, do need treatment and marking. Buyers often ask for the wrong half of that.
How low can the specification go?
Lower than most buyers expect, and three lines still matter: bond, actual thickness and core gaps. A crate wall that splits at the nail line costs more than the sheet saved, so utility grade is fine and a hollow core is not.
Is packing plywood strong enough for pallets?
For deck boards on a one way pallet, usually yes at the right thickness. For repeated handling and forklift entry, ask for a denser core and more plies, or use a different product. Tell the mill the pallet is reused and it will quote differently.
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