Dangerous goods in wholesale trade: what everyone forgets

The UN Model Regulations sort everything dangerous into 9 classes; every transport rulebook in the world builds on them (UNECE ).

• Class 1: Explosives. Things that can detonate or deflagrate. Everyday examples: fireworks, car airbag inflators.

• Class 2: Gases. Anything under pressure, flammable or not. Everyday examples: aerosol cans, camping gas cylinders.

• Class 3: Flammable liquids. Liquids that catch fire easily. The surprise: perfume and sanitizer count, because of the alcohol. Everyday examples: perfumes, ethanol hand sanitizer.

• Class 4: Flammable solids. Solids that ignite from friction or heat. Everyday examples: safety matches, magnesium powder.

• Class 5: Oxidizers and organic peroxides. Substances that feed a fire with oxygen. This is the class that stops hydrogen-peroxide sterilant cartridges from travelling with other cargo. Everyday examples: peroxide sterilants, fibreglass repair catalysts.

• Class 6: Toxic and infectious substances. Things that poison or infect. Everyday examples: pesticide concentrates, lab specimens.

• Class 7: Radioactive material. Rare in wholesale, but it exists in everyday items. Everyday examples: industrial radiography sources, smoke-detector components.

• Class 8: Corrosives. Substances that eat through skin or metal. Everyday examples: drain cleaner (sodium hydroxide), industrial acids.

• Class 9: Miscellaneous. The modern catch-all, and today's most common one: lithium batteries live here. Everyday examples: power banks, magnetized parts.

The same carton follows a different rulebook on a truck, a ship and a plane, and a multimodal shipment must satisfy each leg's rules. What everyone forgets: the strictest leg decides. A product fine for the road can be forbidden for the plane.

• Road (Europe and beyond): ADR. UNECE agreement; enforced by national transport ministries and roadside police. UNECE dangerous goods
• Rail: RID. OTIF; enforced by rail safety authorities. OTIF RID
• Sea: IMDG Code. IMO; enforced by maritime administrations and every container line. IMO IMDG
• Air: ICAO Technical Instructions + IATA DGR. civil aviation authorities and the airlines themselves. ICAO dangerous goods
• Inland waterways: ADN. UNECE; river navigation authorities (Rhine, Danube). UNECE ADN
• USA (all modes): 49 CFR. US DOT / PHMSA; shippers into or inside the US must also register annually with PHMSA. PHMSA HMR

National specifics worth knowing

• European Union: Directive 2008/68/EC makes ADR/RID/ADN uniform law across member states. EUR-Lex 2008/68/EC
• United Kingdom: Carriage of Dangerous Goods Regulations (CDG), enforced by HSE/DVSA; GB mirrors ADR, Northern Ireland follows EU rules. UK HSE CDG
• United States: Annual PHMSA registration for companies offering or transporting hazmat, on top of 49 CFR itself. FAA hazmat (air)
• China: Hazardous-chemical permits and import registration run through the Ministry of Emergency Management, alongside transport rules. MEM (official portal)
• Singapore: SCDF licenses petroleum and flammable materials on top of the modal codes. SCDF
• India: PESO (Chief Controller of Explosives) governs hazardous manufacture, storage and import. PESO
• United Arab Emirates: Chemical imports need pre-approval via MoIAT and port authorities. MoIAT

Segregation: some cargo may not share a container

The IMDG Code keeps reacting classes apart on a ship (an oxidizer away from a corrosive, chemicals away from food). Forget it, and the terminal splits or decontaminates the box at your cost. This is why a peroxide sterilant travels alone even when the container has room.

Air freight: some goods effectively do not fly

Lithium batteries above set limits, strong oxidizers, many aerosols are banned from passenger aircraft or restricted to cargo-only planes with airline-specific variations (IATA lithium guidance ). Plan sea or road for such goods from the start.

Limited and excepted quantities: real relief, sharp edges

Small retail-size inner packagings (think perfume bottles in a carton) can ship with reduced DG formality, but the relief has strict per-inner-packaging and total-mass ceilings. One carton over the line and the whole shipment needs the full regime it does not have.

Packing groups: the box is part of the law

Classed goods carry a packing group (I high danger, II medium, III low) that dictates certified UN-spec packaging. An ordinary carton is not a legal container for them, however sturdy it looks.

Undeclared dangerous goods: the expensive silence

Slipping classed goods into general cargo is treated as a safety violation, not paperwork sloppiness: carrier fines, cargo destroyed without compensation, and in serious cases prosecution (PHMSA ).

• Dangerous goods declaration (the transport document naming UN number, class, packing group).
• The manufacturer's SDS, 16 sections; section 14 is the transport one. Always the manufacturer's own, never a generic download.
• Container packing certificate for sea freight.
• A monitored 24/7 emergency phone number on the papers; clearance stops without it.
• Trained people: in Europe a certified dangerous goods safety adviser (DGSA, ADR 1.8.3) for companies regularly shipping or packing DG; documented DG training for air shippers; annual PHMSA registration for the US.

8 mistakes that cost small traders real money

1. Assuming a courier takes any box that fits the size limits. Hidden aerosols or batteries get scanned, the parcel bounces, and you pay storage while it sits in a depot.
2. Reusing ordinary cardboard boxes. Dangerous goods need UN-specification packaging; the wrong box means rejection at the port and, worse, your cargo insurance quietly stops covering the shipment.
3. Googling a generic safety data sheet instead of getting the manufacturer's own SDS. The UN number on a generic sheet may not match your actual product, and a wrong declaration is treated as YOUR misdeclaration.
4. Judging by smell and looks. If it smells like perfume it is probably Class 3 flammable liquid; 'it is just cosmetics' is how undeclared-goods fines start.
5. Shrink-wrapping incompatible products onto one pallet (bleach next to acids, food next to chemicals). Terminals will split, hold or decontaminate the cargo at your expense.
6. Forgetting the 24/7 emergency phone number on the transport document. Clearance stops until a monitored number is verified.
7. Shipping lithium-battery electronics without checking state-of-charge and packing limits. Airlines confiscate and destroy sample batches; nobody compensates you.
8. Relying on the small-quantity relief without doing the arithmetic. Limited Quantities have per-inner-packaging and total-mass ceilings; one carton over the line and the whole relief vanishes.

Frequently asked questions

How do I know if my product is a dangerous good?

You do not guess and we do not tell you: the manufacturer's safety data sheet (SDS) does, in section 14 (transport information), which names the UN number, class and packing group. If a product has an SDS at all, read section 14 before booking any freight. Perfume, sanitizer, aerosols, power banks and peroxide-based cleaners are all classed goods that people routinely mistake for ordinary cargo.

Why can some goods not share a container?

Because some cargo pairs react: an oxidizer next to a corrosive, chemicals next to food. The IMDG Code's segregation rules say which classes must be kept apart on a ship; a forwarder applies them when planning the box. Mixing them anyway means port holds, forced unpacking or decontamination, all billed to the cargo owner.

Why is air freight so restrictive for dangerous goods?

A fire at 10,000 metres cannot be escaped, so the air rules (ICAO Technical Instructions, applied by airlines through the IATA DGR) ban or tightly limit the highest-risk items: lithium batteries above set limits, strong oxidizers such as concentrated hydrogen peroxide, many aerosols. That is why some products travel only by sea or road, only cargo-aircraft, or only in small excepted quantities.

What documents does a dangerous-goods shipment travel with?

A dangerous goods declaration (transport document), the product's 16-section SDS, a container packing certificate for sea freight, and a monitored 24/7 emergency phone number. In Europe, a company that regularly ships or packs DG must also appoint a certified dangerous goods safety adviser (DGSA, ADR 1.8.3); air shippers need documented DG training.