This is the inspection we teach new grading staff, compressed into something you can do in four minutes on somebody else's lot with no tools. It will not make you a grader. It will stop you buying a pallet of problems.
Minute one: the paperwork, before you touch anything
Ask what was in it. Then ask to see that in writing.
If the answer is a shrug, a vague category, or “it's been cleaned,” stop. You are not buying a container, you are buying an unknown chemical history with a container attached. Prior cargo determines whether the unit can hold food, whether it can be re-marked for regulated service, whether the odour will transfer to your product, and whether any wash will help.
This is not a formality we invented to look serious. Twelve totes described verbally as “just soap” cost us a batch of gaskets and a wash tank in 2010.
Minute two: open the lid and smell it
Unscrew the six-inch cap, put your face over the port, and inhale once.
It should smell of warm plastic and nothing else. If it smells of citrus, mint, perfume, solvent or anything food-like, walk away — those are terpenes and flavour compounds, they have dissolved into the polymer wall itself, and no wash cycle will remove them. A unit that smells of anything is a unit whose next cargo will smell of that thing too.
While the lid is off, look down the inside wall against the light. You are looking for two things: scoring, which is gouging you could feel with a fingernail, and crazing, which is fine surface cracking that looks like frost. Scoring holds residue forever. Crazing is a condemnation — it propagates under stress and it means the bottle has been attacked by a solvent.
Minute three: the corners and the cage
Walk the four lower corners of the bottle and look for stress whitening— chalky, pale patches where the polymer has been mechanically overloaded. A little is a Grade B. A lot means the bottle has been dropped, over-filled or stacked while warm, and it has far fewer trips left in it than it looks.
Then sight along the top rail of the cage from one corner. It should be straight. More than about an inch out of square and the unit will not stack reliably — fixable with a press, which is our problem and not yours if you are buying from somebody without one.
Now check the welds at the tube intersections, especially the lower ones. A bent cage is a repair. A cracked weld is a reject. There is no middle ground, because the cage carries the entire stack load and a failed lattice is how a loaded tote collapses onto the one below it.
Minute four: the threads, the pallet and the stamp
Take the valve off if you can, or at least look hard at the outlet port threads. You are looking for cross-threading — threads that have been chewed by somebody forcing an NPT fitting into an S60x6 port. This is the most common hidden fault in the entire used-tote market, and it is one of the few that condemns an otherwise sound bottle.
The pallet is next, and it is the part buyers consistently ignore. Cracked plastic feet fail in a forklift pocket. Split wooden deck boards fail under load. Rot and insect damage mean the pallet is finished and, if you are exporting, that the shipment is a customs problem. Pallets are cheap to replace and expensive to have fail.
Finally the UN marking. Every character needs to be legible, including the date. A marking you cannot read is not a marking, and the unit is non-regulated service only regardless of what the seller believes. Our decoder page explains each field.
The ten-second version
If you remember nothing else from this article, remember these five:
- No written cargo history, no purchase.
- Smell it. Any smell is a no.
- Crazing, bulging or a cracked weld is a reject, not a bargain.
- Check the outlet threads for cross-threading.
- An illegible UN stamp means non-regulated service only.
What this inspection is not
It is not a leak test. A tote can pass every visual check and still weep at the valve flange — around six per cent of units entering our test cell do exactly that. If you are buying more than a handful of units and your cargo matters, buy from somebody who leak-tests every unit and writes the result down. That is the whole argument for buying graded rather than buying cheap.
Our full system — nineteen points, fixed thresholds, one card per unit — is published on the grade scale page. It is there partly so you can hold us to it, and partly so you can use it on anybody else.
