- DG status depends on the transport context: the same chemical can be DG by sea but not by road – classification follows the mode's rules.
- Concentration thresholds decide Class 8: corrosive classification follows per-substance thresholds, not a generic 30% rule.
- When classification is uncertain, order a classification report – guessing in either direction costs money or safety.
In this guide
| Category | Definition | When does it apply? | Example |
|---|---|---|---|
| Dangerous Goods (DG) | Substances or articles that pose a risk during transport due to their physical or chemical properties | During transportation from origin to destination | UN1203 gasoline, UN1950 aerosols, UN3480 lithium batteries |
| Hazardous Materials (Hazmat) | Materials that pose a risk during storage, handling, or use – not only during transport | Throughout the lifecycle: storage, workplace, consumer use | Industrial solvents stored in a warehouse, asbestos in building materials |
| Non Dangerous Goods | Substances that do not meet any UN classification criteria for transport | All stages, with no special transport controls | Clothing, furniture, most consumer electronics without batteries |
If you are an exporter shipping chemicals, batteries, aerosols, or paints, the single most critical decision you will make before booking a container is whether your product meets the dangerous goods definition. Misclassifying a shipment as non dangerous goods when it is actually regulated can trigger customs holds, carrier refusal, fines, and in some cases, criminal liability. This page gives you a working definition of dangerous goods, the nine UN classes, the criteria that determine whether a substance is regulated, and the UN number system that governs every DG shipment. By the end, you will know exactly what the meaning of dangerous goods is for your supply chain and where your product fits.
What is the definition of dangerous goods in practice? Dangerous goods (DG) are substances or articles which, during transport, present a risk to health, safety, property, or the environment if not properly controlled . The UN Model Regulations do not define the term in a single sentence across all modes, but the operational dangerous goods meaning is consistent: any material that meets the classification criteria for one of nine hazard classes must be shipped as DG . The dangerous goods definition applies across air, sea, road, and rail, although each modal regulation (IMDG Code for sea, IATA DGR for air, ADR for road, RID for rail) implements the UN framework with mode-specific rules .
The table below cuts through the confusion between dangerous goods, hazardous materials (hazmat), and non dangerous goods – a distinction that determines everything from packaging to documentation to freight cost.
The critical takeaway: hazardous materials become dangerous goods when they are transported . A chemical may be hazardous to handle in a factory, but if it does not meet the transport classification criteria, it ships as non dangerous goods. Conversely, a product that is perfectly safe to use can become DG the moment it enters the supply chain because of its transport-specific hazards – for example, a lithium battery inside a laptop.
What this page will settle: By the time you finish reading, you will understand the dangerous goods definition in regulatory terms, know which of the nine classes applies to your product, and recognize the UN number and packing group that determine your shipping requirements. You will also know when your product may qualify as non dangerous goods under limited quantity or excepted quantity provisions.
[source: unece.org] [source: transport.govt.nz] [source: www.greathensen.com]
Dangerous Goods vs. Hazardous Materials vs. Non-Dangerous Goods: A Practical Breakdown
| Feature | Dangerous Goods (DG) | Hazardous Materials (Hazmat) | Non-Dangerous Goods |
|---|---|---|---|
| Primary Context | Transportation | Storage, handling, and use | All contexts |
| Risk Profile | Poses an immediate risk during transport (e.g., fire, explosion, toxicity, corrosion) | Poses a risk to health, safety, or property even when not being transported | Poses no significant risk during transport |
| Regulatory Body | UN Model Regulations, IMDG Code, IATA DGR, ADR, RID | Often regulated by national bodies (e.g., US EPA, OSHA for workplace safety) | Not subject to DG transport regulations |
| Classification | Assigned to one of 9 UN hazard classes | May be classified under systems like GHS for workplace hazards | No UN classification |
| Documentation | Requires a Dangerous Goods Declaration, MSDS, and specific transport documents | Requires Safety Data Sheets (SDS) for workplace safety | Standard commercial documentation |
| Packaging | Must meet UN performance standards (e.g., drop tests) | Must meet appropriate storage and handling requirements | Standard commercial packaging |
The terms "dangerous goods," "hazardous materials," and "non-dangerous goods" are often used interchangeably in casual conversation, but in the regulatory world of international logistics, they mean very different things. Misunderstanding the distinction is one of the most common–and most expensive–mistakes a shipper can make.
The Core Distinction: Transport vs. Use
The fundamental difference between dangerous goods and hazardous materials lies in the context of the risk. Hazardous materials (often abbreviated as hazmat) are substances or articles that pose a risk to health, safety, or property during storage or use. Dangerous goods, on the other hand, are those same types of substances or articles that pose a risk specifically during transportation. In principle, a hazardous material becomes a dangerous good the moment it is loaded onto a means of transport for the purpose of being moved from one location to another.
For example, a cleaning chemical stored in a warehouse is a hazardous material. When that same chemical is packed into a container and shipped by sea, it becomes a dangerous good and must be declared, packaged, and documented according to the IMDG Code. Once it arrives at its destination and is placed into storage again, it reverts to being classified as a hazardous material from a regulatory perspective.
Non-dangerous goods are substances or articles that do not meet the classification criteria for any of the nine UN hazard classes. They pose no significant risk during transport and are not subject to DG regulations. However, the line can be fine: a substance is considered non-dangerous only if its chemical or physical properties are such that it does not present a hazard during transport. Even a typically non-hazardous item can become regulated under specific conditions, such as when carried in bulk.
The Regulatory Framework: A Global System
The international framework for classifying and transporting dangerous goods is built upon the United Nations Recommendations on the Transport of Dangerous Goods, also known as the UN Model Regulations. This "orange book" provides the foundational system that is then adopted and adapted by modal authorities:
- By Sea: International Maritime Dangerous Goods (IMDG) Code
- By Air: International Air Transport Association (IATA) Dangerous Goods Regulations (DGR)
- By Road: European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR)
- By Rail: Regulations concerning the International Carriage of Dangerous Goods by Rail (RID)
While the terminology and specific rules may vary slightly between these modes (for example, the US Department of Transportation uses the term "Hazardous Material" in its 49 CFR regulations, while IATA uses "Dangerous Goods"), the underlying classification system and UN number assignments are consistent across all of them.
Side-by-Side Comparison
The UN Number System
Every dangerous good is assigned a unique four-digit UN number (e.g., UN1203 for gasoline). This number, combined with the proper shipping name (e.g., "MOTOR SPIRIT" or "GASOLINE") and hazard class, provides a universal identifier for the material. This identifier is recognized by authorities and emergency responders worldwide, making sure that everyone handling the shipment understands the hazards involved.
Packing Groups: The Degree of Danger
Within most hazard classes, dangerous goods are further subdivided into packing groups (PG) based on the degree of danger they present. This classification determines the required packaging performance standards:
- Packing Group I: High danger
- Packing Group II: Medium danger
- Packing Group III: Low danger
The packing group directly impacts the type of packaging required. For example, packaging for PG I must pass a drop test from at least 1.8 meters, while PG III packaging only needs to pass a drop test from 0.8 meters. Some classes (e.g., Class 1 Explosives, Class 2 Gases) are not assigned packing groups and have their own specific packaging requirements.
[source: unece.org] [source: logistics.public.lu] [source: maritimenz.govt.nz] [source: enhesa.com] [source: dpd.com] [source: www.greathensen.com]
Classification Criteria and the UN Number System
| Class | Description | Common Examples |
|---|---|---|
| Class 1 | Explosives | Ammunition, fireworks, detonators |
| Class 2 | Gases | Propane (flammable), oxygen (oxidizing), aerosols |
| Class 3 | Flammable Liquids | Gasoline, paint, adhesives, diesel |
| Class 4 | Flammable Solids; Substances Liable to Spontaneous Combustion; Substances which, in contact with water, emit flammable gases | Matches, white phosphorus, sodium |
| Class 5 | Oxidizing Substances and Organic Peroxides | Hydrogen peroxide, ammonium nitrate, benzoyl peroxide |
| Class 6 | Toxic and Infectious Substances | Pesticides, cyanides, clinical waste, biological cultures |
| Class 7 | Radioactive Material | Uranium, medical isotopes |
| Class 8 | Corrosive Substances | Sulfuric acid, sodium hydroxide, batteries |
| Class 9 | Miscellaneous Dangerous Goods | Lithium batteries, environmentally hazardous substances, vehicles |
| Packing Group | Degree of Danger | Packaging Code | Drop Test Height |
|---|---|---|---|
| Packing Group I | High Danger | X | 1.8 meters |
| Packing Group II | Medium Danger | Y | 1.2 meters |
| Packing Group III | Low Danger | Z | 0.8 meters |
Once you understand the dangerous goods definition, the next practical question is: how does a specific product get assigned to a class and a UN number? The process is not arbitrary. It follows a structured, test-based methodology set out in the UN Model Regulations and the associated Manual of Tests and Criteria. This section explains the classification criteria, the nine classes, and the UN number system that every DG shipment must reference.
The Classification Process: How a Product Becomes a DG
The classification of a substance or article as dangerous goods is a multi-step process that any shipper must complete before offering the product for transport. The process generally follows these steps:
- Identify the substance: Determine the exact chemical composition, physical state, and any known hazards of the product. For mixtures and solutions, this often requires testing or calculation based on the properties of the components.
- Consult the Dangerous Goods List: The UN Model Regulations and modal regulations (IMDG Code, IATA DGR, ADR) contain a Dangerous Goods List. This list assigns a UN number and proper shipping name to many commonly transported substances. If your product is listed by name, its classification is already determined.
- Test or calculate for classification: If the product is not listed by name, it must be tested according to the UN Manual of Tests and Criteria to determine its hazard class and packing group. This is common for new chemical compounds, mixtures, or articles that do not have a specific entry.
- Assign the UN number, proper shipping name, class, and packing group: Based on the test results or the Dangerous Goods List entry, the product is assigned a unique four-digit UN number, an official proper shipping name, a primary hazard class (and possibly subsidiary hazards), and a packing group (if applicable).
The Nine UN Hazard Classes
The UN Model Regulations divide dangerous goods into nine classes, each representing a distinct type of hazard. These classes are the foundation of the dangerous goods definition and determine the entire regulatory framework for a shipment, from packaging and labeling to segregation and documentation.
Some classes are further divided into divisions to provide more specificity. For example, Class 1 Explosives has six divisions (1.1 to 1.6) based on the type and severity of the explosion hazard. Similarly, Class 2 Gases is divided into flammable (2.1), non-flammable, non-toxic (2.2), and toxic (2.3) gases. Some substances also have subsidiary hazards in addition to their primary class, which affects labeling and segregation requirements.
The UN Number System: A Universal Identifier
Every dangerous good is assigned a unique four-digit UN number (e.g., UN1203 for gasoline, UN1950 for aerosols, UN3480 for lithium-ion batteries). This number, combined with the proper shipping name, provides a universal identifier that is recognized by authorities, carriers, and emergency responders worldwide. It is the single most important piece of information on a Dangerous Goods Declaration.
The UN number system is extensive. The UN Model Regulations include over 3,000 possible entries, and the ADR 2025 table alone contains approximately 2,900 entries. The system is updated biennially, with new UN numbers added and existing ones revised as new products and hazards are identified. For example, the IMDG Code Amendment 42-24, which became mandatory on 1 January 2026, introduced new UN numbers for lithium-ion battery-powered vehicles (UN 3556) and lithium-metal battery-powered vehicles (UN 3557).
Packing Groups: The Degree of Danger
Within most hazard classes, dangerous goods are further assigned to one of three packing groups (PG) based on the degree of danger they present. This classification determines the performance standard required for the packaging.
For example, a flammable liquid with a very low flash point would likely be assigned to Packing Group I, requiring the most robust packaging. A flammable liquid with a higher flash point might be PG II or III, allowing for less stringent packaging. Not all classes use packing groups. Explosives (Class 1), Gases (Class 2), and some other specific substances do not have packing group assignments.
The Role of the Dangerous Goods List
The Dangerous Goods List (Table A in ADR, or the corresponding list in the IMDG Code and IATA DGR) is the primary tool for classification. For each UN number, the list specifies:
- The proper shipping name
- The hazard class and any subsidiary hazards
- The packing group (if applicable)
- Special provisions
- Limited and excepted quantity limits
- Packaging instructions
For example, the entry for "UN1203, PETROL" specifies that it is Class 3, Flammable Liquid, Packing Group II. This means a shipper of gasoline must use packaging certified for PG II, apply a Class 3 flammable liquid label, and comply with all the special provisions for that UN number.
Practical Classification Steps for Shippers
For a shipper, the classification process typically involves these steps:
- Obtain a Safety Data Sheet (SDS): The SDS provides critical information on the product's physical and chemical properties, including flash point, toxicity, and reactivity.
- Check the Dangerous Goods List: Search for the product's proper shipping name or chemical name in the list. If found, the UN number, class, and packing group are provided.
- If not listed, classify based on properties: Use the UN Manual of Tests and Criteria or consult with a qualified DG consultant to determine the correct classification based on the product's test data.
- Assign the UN number and complete the documentation: Once the classification is confirmed, the UN number, proper shipping name, class, and packing group must be entered on the Dangerous Goods Declaration and the transport document.
Consequences of Misclassification
Misclassifying a product as non dangerous goods when it is actually regulated is a serious compliance failure. It can lead to:
- Rejection of the shipment by the carrier
- Customs holds and delays
- Fines and penalties
- In some cases, criminal liability
- Damage to reputation and business relationships
Correct classification is therefore not just a regulatory requirement; it is a fundamental risk management practice for any exporter.
[source: unece.org] [source: www.freightutils.com] [source: www.msc.com] [source: www.gov.uk] [source: www.greathensen.com]
quently Asked Questions: Consumer Products, Samples, and Exemptions
My product is a consumer good – does it still meet the dangerous goods definition?
Yes. The dangerous goods meaning does not depend on whether a product is sold to consumers or to industry. A consumer product that contains a regulated substance is subject to the same DG rules as any industrial chemical. For example, a spray paint can is UN1950 (Aerosols, Flammable) regardless of whether it is sold at a hardware store or used in a factory. Consumer goods often benefit from special provisions – such as Limited Quantity exemptions – but they are not exempt from classification. If a product meets the classification criteria, it is DG. Shippers must verify the classification of every consumer product before transport.
Are product samples subject to DG regulations?
Yes, product samples are subject to the same regulations as full-scale shipments. If a sample contains a dangerous good, it must be classified, packaged, and documented accordingly. There is no general exemption for "samples" in the UN Model Regulations or the IMDG Code. However, samples may qualify for Excepted Quantity provisions if the quantity per inner packaging and per outer packaging is within the prescribed limits. Excepted quantities are typically very small – for many substances, the maximum net quantity per inner packaging is 1 gram for solids or 1 milliliter for liquids. The package must also meet specific construction and marking requirements. If a sample exceeds the Excepted Quantity limits, it must ship fully regulated.
What is the difference between Limited Quantity and Excepted Quantity exemptions?
Both provisions allow certain dangerous goods to be transported with reduced regulatory requirements, but they are distinct regimes: - Limited Quantity (LQ): Applies when the total quantity per package does not exceed the prescribed limit. LQ packages can often be carried without a full Dangerous Goods Declaration, and the packaging requirements are less stringent. However, the package must still bear the LQ mark. The LQ limits vary by UN number and packing group, and they are typically larger than Excepted Quantity limits. - Excepted Quantity (EQ): Applies to very small quantities of dangerous goods. EQ packages are subject to even fewer requirements than LQ packages. The inner packaging must not exceed specified limits, and the outer packaging must meet a performance test of 1.8 meters. The package must bear the EQ mark. EQ provisions are generally stricter in terms of quantity and packaging construction. It is important to note that not all dangerous goods are eligible for LQ or EQ provisions. Some substances, such as explosives, are excluded from these exemptions.
What makes a product non-dangerous goods?
A product is considered non dangerous goods if it does not meet the classification criteria for any of the nine UN hazard classes. This assessment is based on the product's physical and chemical properties – for example, a product is a flammable liquid only if it has a flash point at or below 60°C (for closed-cup tests) under the IMDG Code. Many substances fall into the non dangerous goods category despite being chemically active. For example, a solid that is not flammable, toxic, corrosive, or reactive will typically be non-DG.
My product contains a small amount of a hazardous substance – is it still non-dangerous goods?
Not necessarily. Whether a product with a hazardous component is classified as DG depends on the concentration and the specific hazard. For many substances, the UN Model Regulations provide concentration thresholds. For example, classification depends on the concentration thresholds set for the specific substance – consult the classification criteria and, where needed, obtain a classification report. Similarly, a mixture with a low concentration of a toxic substance may not meet the classification criteria. However, some hazardous substances are regulated even at very low concentrations. For example, certain environmentally hazardous substances (Class 9) can trigger classification if they contain more than a very small percentage of a listed substance. The only way to determine classification is to apply the UN criteria or consult the Dangerous Goods List.
What documentation is required for a DG shipment?
A DG shipment requires several documents: 1. Dangerous Goods Declaration: A formal declaration that the shipment has been properly classified, packaged, marked, and labeled. This document must be signed by a competent person. 2. Transport Document: The bill of lading or air waybill must include the UN number, proper shipping name, hazard class, packing group (if applicable), and number of packages. 3. Safety Data Sheet (SDS): While not always required for transport, the SDS is necessary for classification and is often required by carriers. 4. Packaging Certificate: Proof that the packaging used meets UN performance standards.
Who is responsible for classification?
Ultimately, the shipper is responsible for the correct classification of the goods. The shipper must verify that the product has been properly tested or assessed and that all documentation is accurate. A manufacturer or supplier may assist, but the legal responsibility lies with the party offering the goods for transport. Many shippers work with third-party consultants or laboratories to verify classification.
Can I rely on the classification provided by my supplier?
Yes, but with caution. A supplier's classification is a useful starting point. However, the shipper should verify that the classification is appropriate for the specific mode of transport (e.g., IMDG Code for sea, IATA DGR for air). There may be variations in the proper shipping name or special provisions. The shipper is also responsible for making sure that the classification remains valid if the product formulation changes. It is good practice to obtain a current SDS and, for critical shipments, to have the classification independently verified.
Where can I find the classification criteria?
The classification criteria are published in the UN Model Regulations, the IMDG Code, the IATA DGR, and the ADR. These documents are available for purchase or from authorized sources. The UN also publishes the Manual of Tests and Criteria, which provides detailed test methods. Many national authorities also provide guidance documents and online tools.
What happens if I declare a dangerous good as non-dangerous goods?
Misdeclaration is a serious offence. The consequences can include: - Immediate refusal of the shipment - Financial penalties and fines - Damage to the shipper's reputation and trading relationships - In some jurisdictions, criminal prosecution Carriers have sophisticated screening processes and may inspect shipments. If a package is found to contain undeclared DG, the shipper may be liable for all costs associated with its handling and disposal, which can be significant. For exporters shipping consumer products, samples, or anything with a hazardous component, when the classification is genuinely uncertain, obtain a classification report – guesswork in either direction carries cost and risk. When in doubt, consult the IMDG Code, IATA DGR, or a qualified DG expert.
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Sources and references
- adrbook.com
- dpd.com
- enhesa.com
- logistics.public.lu
- maritimenz.govt.nz
- transport.govt.nz
- unece.org
- www.freightutils.com
- www.gov.uk
- www.greathensen.com
- www.msc.com
All figures verified from public sources; freight rates marked indicative are confirmed at booking.