What Is a Dangerous Goods Declaration for Shipping? Importer Guide

What a dangerous goods declaration actually is

A dangerous goods declaration (often shortened to DGD) is the document in which the shipper certifies that a consignment containing hazardous material has been correctly classified, packed, marked and labelled for transport. It is not a customs form and it is not optional paperwork you can add later. It is a safety document, and carriers rely on it to decide where the cargo may be stowed, what it can travel next to and how crews should respond in an emergency.

Two things surprise first-time importers.

**Dangerous goods does not mean exotic chemicals.** In transport rules the term covers ordinary consumer products that can burn, leak, corrode or release pressure. A carton of perfume, a pallet of aerosol deodorant or a box of nail polish can all fall inside the definition.

**The declaration is a legal statement.** The person who signs it is confirming that the shipment complies with the applicable transport regulations. If the information is wrong, responsibility usually sits with the shipper who signed, and the consequences can reach the importer through delays, extra charges and rejected cargo.

The exact form depends on the mode of transport. Air cargo uses the Shipper's Declaration for Dangerous Goods defined in the IATA Dangerous Goods Regulations. Sea freight uses a dangerous goods declaration aligned with the IMDG Code published by the International Maritime Organization. Couriers apply their own acceptance policies on top of those rules.

So the practical question is never only what a dangerous goods declaration is. It is whether your product is regulated, under which rules, and who in your supply chain is qualified to prepare and sign the paperwork.

Which products from Thailand commonly count as dangerous goods

Classification depends on the properties of the specific product, not on its category name, so treat the list below as prompts for questions rather than as rulings. The supplier's safety data sheet (SDS) is the starting point: its transport section normally states whether the product is regulated and, if so, the UN number, hazard class and packing group.

Product types that importers from Thailand often find are regulated:

• **Perfumes, colognes and body mists.** Alcohol-based fragrances are typically flammable liquids.
• **Aerosols.** Deodorant sprays, hair sprays, insect repellents and air fresheners are pressurised and often flammable.
• **Nail polish and removers.** Solvent-based and usually flammable.
• **Essential oils and concentrated fragrance oils.** Some are flammable depending on flash point; some carry environmental hazard classifications. Buyers of Thai aromatherapy oils should ask for the SDS for each oil rather than assuming the whole range ships the same way.
• **Alcohol-based sanitisers and some cleaning concentrates.** May be flammable or corrosive.
• **Products containing lithium batteries.** Beauty devices, massagers and small electronics fall under battery rules.
• **Certain adhesives, paints, inks and pool or agricultural chemicals.**

Many everyday Thai exports are not regulated at all: most creams, lotions, shampoos, dry foods and snacks ship as general cargo. But do not classify by intuition. Two inhalers or two massage oils that look identical on a shelf can have different transport status because of formulation.

A useful habit: before confirming any order, ask the supplier one direct question in writing: is this product classified as dangerous goods for air or sea transport, and can you send the current SDS? Their answer tells you a lot about their export experience.

What the declaration contains, field by field

Formats differ between air and sea, but the core information is consistent. Knowing the fields helps you check a draft before the cargo moves, even if you are not the one signing it.

• **Shipper and consignee details.** Full names and addresses that match the commercial invoice and transport document.
• **UN number.** A four-digit identifier assigned to the substance or article, written with the letters UN in front.
• **Proper shipping name.** The official transport name from the regulations, not the brand or marketing name.
• **Hazard class or division.** For example flammable liquids, gases, corrosives or miscellaneous dangerous goods, plus any subsidiary hazard.
• **Packing group.** Where applicable, indicating the degree of danger.
• **Quantity and type of packaging.** Number of packages, the kind of packaging used and the net quantity per package.
• **Packing instruction and authorisations.** Particularly on air shipments, including whether limited quantity provisions are being used.
• **Emergency contact information.** As required by the mode and the countries involved.
• **Signed certification.** Name, date and signature of the person declaring that the consignment is fully and accurately described and is in proper condition for transport.

Three checks catch most errors. First, the UN number and proper shipping name on the declaration should match the transport section of the SDS. Second, the quantities should match the packing list exactly. Third, the marks and labels on the outer cartons should match what the declaration says.

Also ask whether the product qualifies for limited quantity or excepted quantity provisions. These allow small inner packages of certain dangerous goods to move under simplified conditions, which can change cost and routing options significantly. Whether they apply is a technical decision for a trained person, not something to assume from the size of the bottle.

Air versus sea: how rules and paperwork differ

The mode of transport changes the regulations, the form and the practical constraints, so decide the mode before you finalise packaging.

**Air freight.** Governed in practice by the IATA Dangerous Goods Regulations, which are based on the ICAO Technical Instructions. Air rules are the strictest on quantity per package and on packaging performance, and some items are restricted to cargo aircraft or not accepted at all. The Shipper's Declaration must be completed by someone with current dangerous goods training, and airlines can apply their own additional restrictions. Expect a dangerous goods acceptance check and a surcharge.

**Sea freight.** Governed by the IMDG Code. Larger quantities are possible, and many products that are awkward by air move routinely by sea. You will usually need the dangerous goods declaration and, for containerised cargo, a container packing certificate confirming the goods were loaded and secured properly. Shipping lines have their own booking procedures for hazardous cargo and may need approval before accepting the booking.

**Courier and postal services.** Often the most restrictive. Many express services accept only a narrow range of dangerous goods, sometimes only from approved account holders, and postal services prohibit most of them. Samples are where importers get caught: a few bottles of perfume sent as ordinary samples can be stopped or returned.

Trade-offs to weigh:

• Air is faster but limits quantities and costs more per kilo for regulated cargo.
• Sea handles volume but requires more planning around booking approval and segregation.
• Mixed shipments can be complicated when regulated and non-regulated goods share a container.

Rules are updated regularly, so confirm current requirements with your freight forwarder and the carrier rather than relying on a past shipment.

Who is responsible, and what goes wrong

Under transport regulations the shipper is responsible for classifying, packing, marking, labelling and documenting dangerous goods. In practice the work is often shared: the manufacturer provides the SDS and test information, a specialist packer or forwarder prepares compliant packaging and paperwork, and a trained person signs. As the importer you may not sign anything, but you carry the commercial risk, so you need to know who is doing each step.

Your Incoterm matters here. Under terms where the supplier arranges export and main carriage, they normally organise the declaration. Under EXW or similar terms your own forwarder takes over much earlier, and you need to make sure the supplier still provides accurate product information and suitable packaging.

Common problems:

• **Undeclared dangerous goods.** The supplier or buyer assumes a consumer product is harmless. This is the most serious failure because it is a safety issue, and carriers treat it accordingly.
• **Outdated or generic SDS.** The sheet describes a similar product, not the one being shipped.
• **Wrong packaging.** Retail packaging that is fine on a shelf may not meet transport requirements.
• **Mismatch between documents.** Quantities or descriptions differ between the declaration, invoice and packing list.
• **Samples sent casually.** Regulated samples dispatched by ordinary courier without declaration.
• **Destination rules overlooked.** The cargo is accepted for transport but the importing country has its own hazardous goods, chemical or product registration requirements.

Consequences range from re-packing costs and missed sailings to refusal, fines and a damaged relationship with your forwarder. None of these are inevitable. They are almost always the result of the classification question being asked too late.

A step-by-step plan before you place the order

Handle dangerous goods as a sourcing question, not a logistics afterthought. This sequence works for most importers.

1. **Ask for the SDS at quotation stage.** When you request quotes from Thai suppliers, include a line asking for the current safety data sheet and confirmation of transport classification for each product. 2. **Send the SDS to your freight forwarder.** Ask them to confirm whether the product is regulated by air and by sea, whether limited quantity provisions may apply, and what the cost and routing implications are. 3. **Confirm who prepares and signs the declaration.** Supplier, forwarder or specialist dangerous goods agent. Get it in writing, together with who pays. 4. **Agree packaging before production.** Inner pack size, outer carton specification, marks and labels. Changing packaging after the goods are packed is the expensive way to do it. 5. **Check destination requirements.** Ask your customs broker or the relevant authority in your country whether the product needs any import permit, registration or local labelling beyond transport rules. 6. **Plan samples properly.** Tell the supplier which courier service will be used and confirm it accepts the product. 7. **Review the draft documents.** Compare the declaration with the SDS, invoice and packing list before the cargo is handed over.

Supplier experience makes a visible difference. Exporters who ship regulated products regularly will answer the classification question quickly and already know their packaging options. Whether you find suppliers through trade fairs, the Thai government's DITP resources, sourcing agents or a marketplace of verified Thai suppliers such as THAIMOST (thaimost.com), make export documentation capability part of your evaluation, and still verify the documents yourself.

Finally, keep a file for each product: SDS, classification confirmation, packaging specification and past declarations. It makes repeat orders faster and gives you something concrete to check when a formulation or pack size changes.