Perishables fail in the gaps between legs, not in the middle of them. The handovers are where the cold chain breaks.
A reefer container holds temperature reliably while it is powered and sealed. Almost every cold chain failure happens at a transition: loading, yard storage, port handover, customs examination, or the final delivery leg.
| Point | Risk |
|---|---|
| Pre-cooling | Loading warm product into a cold container never recovers the temperature |
| Loading | Doors open on a dock without a cold tunnel undoes the pre-cooling |
| Port yard | Plug-in availability and monitoring vary enormously by terminal |
| Transhipment | Every additional hub is another unplugged interval |
| Customs examination | A physical inspection means an open container |
| Last mile | Frequently the least controlled leg of the entire journey |
A reefer maintains temperature; it does not remove field heat. Product loaded warm arrives warm, and no amount of container performance fixes it.
Perishable consignments typically need a phytosanitary or health certificate, a temperature record, and often a pre-shipment inspection. Any of these missing at destination can hold a consignment long enough to destroy it.
Direct sailings matter far more for perishables than for dry cargo, because each transhipment adds an interval you do not control. Check whether the lane you are planning is genuinely direct before you promise a shelf life.
Cold chain and refrigeration equipment itself is a traded category worth watching — new capacity shows up as imports before it shows up as service: see logistics and cold chain trade data.
A reefer container is a reliable machine. What is not reliable is the sequence of hands the container passes through, and every handover is a point where power can be interrupted, doors can be opened, or a setpoint can be changed by someone acting on incomplete instructions. Cold chain failures are therefore almost always organisational rather than technical, and they are prevented by specifying the setpoint, the ventilation and the humidity in writing at every leg rather than assuming continuity.
| Leg | Who controls temperature | What to specify |
|---|---|---|
| Pre-cooling | The exporter | Product core temperature before loading, not container temperature |
| Loading | The exporter | Cold dock or tunnel, and maximum door-open time |
| Inland to port | The haulier | Genset or plug-in, with continuous monitoring |
| Port yard | The terminal | Plug-in on arrival and monitoring frequency |
| Ocean leg | The carrier | Setpoint, ventilation, humidity, and data logging |
| Transhipment | The hub terminal | Maximum unplugged interval |
| Destination and last mile | The importer | Plug-in and delivery within an agreed window |
Modern reefers log continuously, and that record is the only objective account of what happened to the cargo. It matters commercially as well as operationally: in a claim, the logger distinguishes a product loaded warm from a container that failed, and those two outcomes have completely different liability. Agreeing at contract stage who receives the log and within what period is a small piece of housekeeping that decides how a dispute goes.
For dry cargo a transhipment is a delay. For perishables it is a risk event and a consumption of shelf life, and two transhipments can remove enough of the sellable window to change the economics of the shipment. Checking whether a lane is genuinely direct — rather than nominally direct with a hub call — belongs in supplier selection rather than in logistics optimisation afterwards.
Agree the remaining shelf life on arrival, not just the transit time. They are different promises, and only one of them is what the buyer actually needs.
Everything above is a framework, and a framework is only worth what it survives contact with. The useful discipline is to test each assumption against what consignments actually did, because customs data is one of the few commercial sources where the underlying event — goods crossing a border — physically happened and was documented under legal obligation at the time.
Fix the tariff line before anything else. Every filter, every duty figure and every comparison downstream depends on it.
Learn more ›A single period is a snapshot. Three years separate a trend from seasonality, and let you discount the incomplete recent periods.
Learn more ›Frequency and consistency beat size. A steady mid-scale counterparty is usually a better prospect than an occasional large one.
Learn more ›Declared unit values tell you the range you are entering before you quote into it.
Learn more ›Two failure modes account for most wrong conclusions drawn from trade data, and both are easy to avoid once named. The first is reading the incomplete tail of a series as a decline — authorities publish on a lag and revise afterwards, so the last one or two periods will fill in after you look. The second is reading a value movement as a demand movement, when declared value can move because volume moved, because unit price moved, or because the product mix inside a tariff line changed.
Customs data covers goods that crossed a border. It does not cover services, domestic trade, margin, contract terms or intent. Treat it as a dated, quantified observation to corroborate — not as a conclusion that arrives finished.
The difference between teams that get value out of trade data and teams that ran one interesting project is almost never analytical sophistication. It is whether the work became a routine. A saved query reviewed weekly, a short written note against each counterparty you assessed, and a standing habit of checking the period stamp before quoting a figure will out-perform an elaborate one-off study within a quarter, because markets move and a study does not.
The second habit worth building is writing down not just what you concluded but why and when. Records get revised, prices move, and counterparties change behaviour. Six months later nobody remembers whether a supplier was rejected on volume, on price band or on timing, and without that note the assessment simply gets repeated from scratch. A one-line rationale is what converts a list into institutional knowledge, and it costs seconds at the point where the thinking has already been done.
Finally, be explicit with colleagues about the confidence attached to any figure you circulate. A declared value from a complete period, controlled for origin and unit, is strong evidence. The same figure pulled from an incomplete recent period, averaged across a whole chapter, is barely evidence at all — and the two look identical once they are in a slide. Saying which one you have is what keeps trade data credible inside an organisation over time.
Handovers rather than equipment. Loading warm product, unplugged intervals in yards and at transhipment hubs, and an uncontrolled last mile account for the large majority.
No. It maintains a temperature. Product must be pre-cooled to its target core temperature before loading, and a container cannot recover field heat afterwards.
It depends on where the chain broke, which is why the data logger record is decisive. Agree in advance who receives it and how quickly.
They are common but they consume shelf life and add risk. Where the remaining shelf life on arrival is a contract term, a direct sailing is often worth paying for.
Markets refresh on their customs authority's own release cycle — monthly for most, 45 to 60 days for a few. The most recent one or two periods are always still filling in, so exclude them when you are reading a trend rather than treating the gap as a decline.
Yes. Give us the HS code or a product description and the market you care about, and we will return a sample of live customs records filed against it.
Keep reading
The next questions this one usually raises are covered in Container types and shipping modes, Reading port data for logistics decisions and Quality and compliance for exports. Each picks up where this article stops, and together they cover the sequence a consignment actually goes through — classification and duty before anything moves, documentation and payment while it moves, and verification of the counterparty before any of it is committed to. Reading them in that order is usually more useful than reading them by topic.
The box you ship in constrains what you can ship, what it costs and how long it takes.
Learn more ›The port pair on a record is the closest thing to a free freight quotation, and it settles arguments that otherwise run on assertion.
Learn more ›Regulation is a gate, not a preference.
Learn more ›