Shanghai International Logistics Co., Ltd.
Export packaging stock: standards, pallets, marking and rotation
Export packaging is often the last thing decided on a shipment, between the loading plan and the carrier booking. A carton that works on a domestic truck may fail at a container lashing point, or after six weeks in a hold where condensation forms inside it. The packing specification is engineering documentation, not a line on a packing list.
Three failure modes dominate: compression failure, where the stacking load exceeds the board's compression strength; moisture failure, where cargo moves from a warm, humid room into a refrigerated container; and handling failure, where a carton marked fragile is handled as neither because its marks ended up buried in the stack. A written specification also gives the packers a checklist, so board grade, closure method and pallet type become items to verify.
| Element | Must fix | If left open |
|---|---|---|
| Carton board | Flute type, grade, strength | Collapse in the stack |
| Closure | Tape grade, seam coverage | Seam opens in humidity |
| Pallet | Size, construction, load | Load shift, rejection |
| Dunnage | Material, edge cover | Crushed corners |
| Marking | Face carrying labels | Symbols hidden |
ISPM 15 is the international standard for the treatment of wood packaging material used in international trade. It applies to solid wood thicker than 6 mm: pallets, dunnage, crates and blocking. The requirement is heat treatment to a core temperature of at least 56 degrees Celsius for 30 minutes, or an equivalent treatment approved by the importing country's plant protection body.
Compliance is visible on the timber. The approved supplier brands the mark on the wood with the country of treatment and the registration number allocated by the national authority. The mark must be legible, permanent and not removable without damaging the wood, and the same expectation extends to dunnage and blocking, which changes how packaging stock is bought.
| Mark element | Meaning | Check at receipt |
|---|---|---|
| IPPC symbol | Treated under ISPM 15 | Legible on two faces |
| HT code | Heat treatment used | Matches the order |
| Country code | Where treated | Matches sourcing record |
| Producer code | Registered facility | Check the registry |
| Serial number | One-pallet traceability | Matches shipment file |
Carton markings serve three audiences: the warehouse that handles the box, the carrier that moves it and the inspector who opens it. They should state what is inside, gross and net weight, which face is up and the stacking limit.
Handling symbols follow ISO 780, which uses a small set of pictograms: fragile, keep dry, this way up, do not clamp here and centre of gravity. Placement decides their usefulness: they belong on the side of the carton that faces outward on the pallet, and in a container no film label, shipping label or dunnage may cover them.
Alignment with paperwork matters more than the symbols. Carton count, dimensions, gross and net weight should agree with the packing list, the bill of lading and, for regulated cargo, the dangerous goods declaration. Discrepancies trigger stuffing checks and can stop a container at the terminal.
Pallet choice follows the load and the journey. Block pallets spread the load across more boards and allow more fixing options for dunnage. Stringer pallets are lighter and cheaper but weaker in bending, and their open stringers allow fork entry from more angles. Panel or collar pallets give the flat surface drums and crates need. Dimensions decide how many units fit in a container: a pallet that overhangs the doorway reduces usable volume and is a common reason a loading plan is rejected.
Load capacity is specified separately from size. A pallet can suit the product and still fail the handling method, because a short-mast fork truck, a reach stacker and manual block stacking impose very different point loads on a deck. Deck boards and stringers also decide the dunnage strategy: a board-deck pallet accepts screws driven into the carton, provided the fix does not breach the product or the moisture barrier, while a stringer pallet needs banded dunnage.
Load planning starts from the container's internal dimensions rather than from the pallet. Standard and high cube units of 20 and 40 feet differ in length and headroom, and doorway width limits the pallet size that can be driven in. The planner counts the pallet positions that fit the floor, subtracts door and lashing clearances, and confirms gross weight stays below the floor limits.
Protective material is chosen against the risk profile of the route. Sea freight means humidity, condensation, salt contamination and weeks of stack pressure. Air freight means a pressure differential between hold and ramp and a high cost for damage. Road transport adds vibration and braking.
Moisture is the most frequent cause of packaging-related cargo claims in sea freight, and three mechanisms address it. Barrier films, in polyethylene or laminated grades with low vapour transmission, restrict vapour movement. Desiccants, typically silica gel, capture what the barrier cannot exclude. The detail that decides performance is the sealing perimeter: a barrier film is only as good as its edge seal.
Vibration and impact need different responses. Vibration is a fatigue problem: the usual failure is a carton crushing gradually at the bottom over a long haul, mitigated by board strength, a close pallet fit and inserts. Impact is a short-duration problem, handled by edge protectors, internal blocking and crates where the product tolerates no movement.
| Hazard | Typical failure | Material | Limitation |
|---|---|---|---|
| Moisture | Softening, mould, corrosion | Barrier film, desiccant | Only as good as the seal |
| Vibration | Bottom bulge, load failure | Higher grade, tight fit | Adds cube and weight |
| Impact | Crushed corners, punctures | Edge protectors, crates | Adds handling steps |
| Corrosion | Rust staining, film attack | Vapour inhibiting wrap | Needs continuous contact |
| Abrasion | Scoring, lost print | Overwrap, strapping pads | Consumes consumables |
Over-protection also has a cost. Extra cube means paying freight on air, extra tare weight reduces the payload, and more materials mean more labour. Protect against the hazard identified for the route, then test the result, because a pack test under vibration and drop shows whether the stack works or just adds weight.
Packaging stock is often given whatever space is left over. It should be planned like any other inventory: a defined location, a known quantity and an inspectable condition. A workable layout separates three zones. Bulk storage holds empty pallets, blanks and assembled cartons on racking. A picking area holds film, tape, edge protectors and labels in bins near packing stations. A quarantine area holds failed stock.
Racking specification follows load and handling. Carton blanks and flat-packed boxes stack economically but lose compression strength if they sit flat and unloaded for long periods, so store them dry, off the floor and clear of traffic. Pallets on the floor should sit on dunnage or bearers rather than on concrete, and stack height should be limited so every pallet above the first is supported.
Humidity and pest control are continuous issues rather than seasonal ones. Cardboard is hygroscopic and attracts insects when stored warm and damp, which then travel into the container as an infestation risk. The consumables area has its own problems, because solvent-based adhesives are flammable and some release vapours that affect nearby cartons, so fire separation, chemical storage and ventilation belong in the layout. Aisle planning follows the handling equipment: space a fork truck cannot reach is not stock but an obstruction, and blocked aisles damage pallets.
Rotation rules exist because packaging consumables degrade quietly. Stretch film loses its tack and turns brittle, tapes lose adhesion, corrosion inhibiting materials and desiccants have a limited useful life, and printed labels fade until unreadable. An inventory report showing several hundred cartons will not reveal that the oldest film lot has sat on the shelf for two years.
FIFO is the default because most packaging stock is consumed in the order received and its usable life is long. FEFO is required where the date matters: adhesive and sealant lots, vapour corrosion inhibiting materials, desiccants with a saturation indicator, and inks or coatings with a shelf life. The lot identifier must be captured on receipt, because a rotation rule cannot apply to undated stock.
Consistent lot marking makes rotation enforceable. Ask every supplier to state the production date in a fixed, unambiguous format, ideally ISO 8601, and to carry the same identifier on the outer packaging and the certificate of analysis. On receipt the lot code is recorded against the stock item, so picking follows a rule, not a habit.
Inspection at receipt sets the standard for everything that follows. Checks cover board grade against the specification, the closure method, pallet condition including splits, protruding nails, missing boards and warped stringers, timber moisture content and treatment marks. Stock that fails is quarantined, then reworked or written off.
Reusables and pooled packaging change the arithmetic. A returnable pallet pool, reusable plastic crates and heavy-duty reusable pallets all carry reverse logistics costs: collection, inspection, repair and storage. They pay off when the loop is controlled and reuse cycles are long. They lose money when empty units scatter across too many sites, when damage is found at return rather than in a repair area, or when the pool is counted on a cycle longer than the contract.
Packaging stock is a consumable rather than a saleable item, so it is managed by location, condition and rotation date, not by order value. That means bin locations for small items, a lot field for anything with a shelf life, and a quarantine status for failed stock. Empty reusable units, which are assets with a cycle count and a repair route, need separating from single-use stock.
No. ISPM 15 governs wood packaging material and specified processed wood products, so plastic, composite and metal pallets fall outside its scope and need no treatment mark. That does not exempt them from other controls: some countries apply import restrictions, and many buyers require plastic pallets to carry identification or rental marking so returnables are not treated as abandoned cargo.
The cycle depends on value and movement, not on a fixed calendar rule. Fast-moving consumables such as film and tape are better managed by minimum and maximum levels that trigger replenishment, so a physical count is needed only periodically. Slow-moving or high-value items, especially reusable pallets and treated dunnage, need scheduled cycle counts and condition checks. Quality inspection is separate from the quantity count, because damage and ageing do not show in a stock report.
The answer follows the contract, not the packing error. Under Incoterms 2020, risk for damage during carriage sits with the seller until risk transfers to the buyer at the agreed point, while the carrier remains liable for loss or damage in its custody, subject to the carriage contract. The specification is the evidence: if it was agreed, written and followed, the argument is usually straightforward, whereas if it was never defined, the carrier may dispute the packaging suited the route.
Shanghai International Logistics Co., Ltd.