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Timber export crates almost never fail on strength. They fail on paperwork: a treatment slot that pushes dispatch back two days, an IPPC stamp that has to be legible, a destination inspector who wants a certificate that the supplier never issued. The board in this page avoids that entire category of problem by not being wood.
Because PP hollow sheet is not a solid-wood packing material, it falls outside the ISPM-15 regime. There is no heat treatment, no methyl bromide fumigation, no phytosanitary certificate and no stamp to apply. A crate can be built and closed the same day the parts are ready, which is usually the difference between making a vessel cut-off and waiting for the next one.
Customs handling is simpler for the same reason. There is no bark, no insect lifecycle, no soil and no moisture-driven mould to find during inspection. Where a shipment does get opened, the officer sees a clean polymer panel rather than a case for a treatment query, and the load is closed again without a delay note.
Specification follows the duty rather than a single catalogue figure. Sheets run from 2 mm to 12 mm, with weights from about 250 to 3500 g/m², and the grade is chosen from the crate size and the mass it will carry. Light divider sets run at the thin end; a crate body carrying machined castings sits at 8 to 10 mm with edge reinforcement.
Flute orientation is a design decision with a measurable effect. Standing flutes vertical puts the wall in its strongest direction for compression and stacking; running them horizontal favours bending stiffness across a wide panel span. On a cut-to-size order we confirm orientation before the saw is set, because reversing it later is not an option.
Where a panel span is large, we add structure rather than thickness. Edge trims, internal corner posts and double-wall sections at the base carry load more efficiently than a single heavy sheet, and they keep the tare weight low enough for manual handling.
Against cardboard, the advantage is water. A container crossing the tropics condenses moisture on its own inner surfaces, and a fibre crate absorbs that film, softens and loses stacking strength within days. PP sheet absorbs less than 0.01%, so the crate leaves the vessel as stiff as it was loaded.
Printing travels with the shipment. Corona treatment above 46 dyne/cm holds shipping marks, barcodes and handling symbols without the ink lifting in humid conditions or rubbing off against an adjacent crate.
After arrival, the crate is a recyclable PP item in most destination markets, and in a closed loop it simply comes back and goes out again. Either way it does not become treated wood waste at the far end of the route.
Send us the crate drawing, the loaded weight and the destination country, and we will specify sheet grade, flute orientation and edge treatment for that route.
