Most shippers meet Class 9 by accident. They book what feels like an ordinary shipment — power tools, an inverter, a machine, a pallet of electronics — and the carrier comes back asking for a dangerous-goods declaration. The freight didn’t change. It was always regulated; they just hadn’t shipped it as dangerous goods before.
The class for everything that doesn’t fit
Dangerous goods are sorted into nine classes by hazard type — explosives, gases, flammable liquids, and so on through class 8, corrosives. Class 9 is the miscellaneous class: substances and articles that present a real transport hazard but don’t fit classes 1 through 8. It’s the catch-all, and it’s crowded. Class 9 includes:
- Lithium batteries — by far the largest slice, and the reason Class 9 keeps growing.
- Dry ice (solid carbon dioxide), which sublimates and displaces oxygen.
- Magnetized material that can interfere with aircraft instruments.
- Environmentally hazardous substances — marine pollutants.
- Elevated-temperature materials like hot asphalt.
- Vehicles and engines with batteries or fuel systems.
Why lithium put half your catalog in Class 9
The single biggest reason ordinary freight is now dangerous goods is the lithium battery. It’s in phone-sized electronics, power tools, e-bikes and scooters, backup power units, solar inverters, medical devices, and any machine with a battery. Every one of those is a Class 9 shipment or contains one — see the lithium guide for how the UN numbers work.
That’s the trap: a product can be completely benign to use and still be regulated to transport, because transport hazard is about what happens in a crash, a fire or a sealed hold — not about normal use.
What Class 9 actually changes about your shipment
Once freight is Class 9, four things follow:
- A UN number and proper shipping name. The product must be identified by its regulated identity, not its trade name.
- Specified packaging. Class 9 entries carry packing instructions — for lithium batteries, detailed ones about state of charge, terminal protection and inner packaging. Some entries carry a packing group; many lithium entries don’t, following their own instructions instead.
- Marks and labels. The Class 9 label, the lithium-battery mark where it applies, and handling marks go on the package.
- Documentation that all agrees. A dangerous-goods declaration that matches the safety data sheet and the commercial invoice — covered here.
Sea and air are not the same test
A Class 9 shipment that’s straightforward by ocean under the IMDG Code can be far more restricted by air, where lithium rules are tighter. So “is it dangerous goods?” isn’t one question — it’s “dangerous goods by which mode, under which edition of the rules.” Mode choice can be the difference between a shipment that flies and one that doesn’t.
The practical takeaway
If your product has a battery, a fuel system, dry ice, or a marine-pollutant ingredient, assume Class 9 until proven otherwise — and check the safety data sheet’s transport section before you book, not after the carrier flags it. Class 9 is our daily work, not a special favour: send us the product details and we’ll tell you exactly how it has to move.