Dangerous Goods from China: Classification, SDS Section 14 and the Shipment That Gets Refused at the Desk

The order that was refused at the freight forwarder's desk

A reasonably experienced importer I work with put 280 units of an aerosol-based maintenance product on a boat in late spring and told the forwarder it was "consumer goods, no special handling". It came back. Not seized, not repacked, refused for carriage — the airline that was going to take the last leg declined it because the shipper's declaration didn't describe an aerosol. Two months of delay, a warehouse bill, and a rebooking that cost more than the margin on the whole consignment.

That story is the reason I now treat dangerous goods compliance as a design input rather than a paperwork step. It also explains why the questions in this piece get asked in the first fortnight of a project rather than the last.

It's about a class, and the class is decided by chemistry, not marketing

Dangerous goods for transport get classified under the UN model regulations, which most people meet through IATA rules for air and IMDG for sea. The classes run from 1 (explosives) through 2 (gases, including aerosols), 3 (flammable liquids), 4 (flammable solids and substances that react with water), 5 (oxidizers and organic peroxides), 6 (toxic and infectious), 7 (radioactive), 8 (corrosives) and 9 (miscellaneous, which is where lithium batteries, magnets and a surprising amount of other product lands).

Two things follow from that and neither is intuitive. First, the class is a property of the substance, so a "safe" product with 40% ethanol in it is a class 3 flammable liquid regardless of what the brand says. Second, the same product can be classified differently for air and sea, because flash point and vapour pressure behave differently under altitude and pressure — which is why a product can fly and not sail, or vice versa, and why your forwarder needs to know the mode.

MSDS, SDS, and why the one you have may be the wrong document

Everyone has an MSDS from the supplier. Roughly half of the ones I've been handed are unusable for transport, because they were written for the factory's own workplace use and are missing the transport section or carry a generic one that names the wrong UN number and packing group.

What the transport chain actually needs is a safety data sheet in the current 16-section format, with section 14 filled in for the relevant mode: UN number, proper shipping name, class, packing group, and any special provisions. If you are shipping by air, that needs to match the IATA dangerous goods list for the substance. If by sea, IMDG. A generic "not restricted" in section 14 for a product that contains 65% isopropyl alcohol is a document that will be rejected at acceptance and will make the forwarder look at you differently for the rest of the project.

I ask for the SDS before I ask for a price now, and I ask which database it was checked against. Good chemical suppliers know. Poor ones send a PDF with a version number and no revision history, which tells you nobody has reviewed it since 2013.

Quantities: the thresholds that decide whether it's worth shipping

There's a reason small quantities of dangerous goods can move with much less paperwork. Air freight has limited quantity provisions (Y-packing instructions in IATA), and sea freight has excepted quantities and limited quantities under IMDG. Get under the threshold and a consignment can often travel as limited quantity with a marking on the carton and a shipper's declaration, rather than a fully UN-certified package with a dangerous goods declaration prepared by a trained signatory.

The details are technical and mode-specific, and this is the one area where paying a licensed DG consultant for two hours is genuinely cheaper than the alternative. But the commercial implication is simple and worth designing around: if you can keep unit size or per-carton quantity below the limited quantity threshold, you widen your freight options considerably. I've seen a product redesigned from a 500ml can to four 100ml cans and go from "only one forwarder in the region will touch it" to "normal LCL booking".

Lithium batteries, which are class 9 and get tested more than anything else

Almost every battery-containing product I've dealt with falls under UN3480 (cells and batteries on their own), UN3481 (in equipment or packed with it) or UN3090/3091 for lithium metal. The document you need is the UN38.3 test summary, and the thing to understand is that it's a test report on a specific cell, at a specific capacity, under specific conditions. It is not transferable to a different cell from a different supplier even if the capacity matches.

Some practicalities that have bitten people. The test summary must match the cell in the pack, and the pack must be manufactured from cells in the tested configuration — a pack made from the right cell but wired in a different series/parallel layout is a different article for this purpose, and forwarders do check. The battery mark or label has to be correct for the mode, and for a pack that's small enough to be exempt from the full marking requirement there are still watt-hour limits that the person at the acceptance desk will measure. And an "in equipment" or "packed with equipment" declaration has a specific meaning: a spare battery in the box is packed with equipment, a battery installed in a device that is switched off is in equipment, and the two have different packing instructions.

Every one of those points has come up as a refused shipment in someone's timeline, and none of them is negotiable at the airport.

UN packaging, and the certificate that has to match the box

If your product needs a UN certified package, the marking stamped on it is a certificate reference, and the certificate has to exist and cover that packaging design and the packing group and gross mass you're using. Buying a "UN box" from a supplier who printed a marking on it and cannot produce the certificate is a common and expensive mistake, because the marking is only valid if the design was actually tested and the certificate is on file with the packaging manufacturer.

For a combination package, the certificate covers the inner packaging and the outer — so swapping the inner bottle for a cheaper one invalidates the whole assembly. I've seen this at a repacking warehouse, where a client changed a supplier for the inner container to save three cents and created a package that no longer matched its certificate.

Packing group, limited quantity marks and the small details that get caught

Packing group I, II or III is an internal classification of danger for the same class; II is the most common for industrial solvents. It changes the packaging performance level required and it changes the paperwork. Getting the packing group wrong is one of the most common document errors, and it's the one a dangerous goods acceptance checker will spot fastest because it's on the first page.

Beyond that: the limited quantity mark has a specific format and a minimum size; the orientation arrows go on liquid packages; the "cargo aircraft only" label changes the routing; and the shipper's declaration has to be signed by someone with a training record that the forwarder can inspect. This last piece is not a formality — it is a legal competence, and the signatory is personally accountable for what's on it.

The commercial reality

Several real product categories are simply hard to ship direct from a China factory to a Western market as dangerous goods, which is why so many brands export the concentrate and formulate locally, or set up a co-packing arrangement in the destination. That's not a compliance workaround so much as a supply chain design decision, and it's usually cheaper than a fully certified DG air consignment at small volume.

If you're doing this for the first time, the sequence that works is: get the SDS section 14 for the correct mode, get a UN38.3 summary or the chemistry classification as applicable, ask the forwarder to confirm in writing that they can carry it and who prepares the declaration, and only then negotiate the price. Every one of those steps is cheaper before the goods exist than after.