- Placards are required once a single UN number exceeds 4,000 kg gross mass in packages on one transport unit.
- Tanks up to 3 m³ can use labels instead of placards in most regimes – bigger tanks and containers take the full 250 mm diamond.
- Minimums differ by regime: ADR/IMDG placards run 250 mm; US 49 CFR placards use a 30-day weather-exposure standard for the substrate.
In this guide
If you are responsible for shipping, storing, or handling hazardous materials, you need to know exactly which dangerous goods placards to apply, where to put them, and what the regulations require. This page gives you the bottom line on placard classes, dimensions, color rules, and placement for containers, vehicles, and packages – so you can stay compliant and keep shipments moving.
Dangerous goods placards are the diamond-shaped warning signs displayed on the outside of transport vehicles, freight containers, and bulk packages. They communicate the primary hazard class of the contents at a glance to drivers, dock workers, and emergency responders. Placards are larger than hazard labels (which go on individual packages) and are required whenever a vehicle carries hazardous materials above certain quantity thresholds – generally 1,001 pounds for most hazard classes, with Table 1 materials requiring placards at any quantity.
The global regulatory framework for dangerous goods placards rests on three pillars: the IMDG Code for maritime transport, 49 CFR (U.S. Hazardous Materials Regulations) for domestic highway, rail, and water shipments, and ADR for European road transport. Each sets out detailed specifications for placard size, color, symbols, and placement. The UN Model Regulations provide the underlying classification system that all three adopt.
Whether you are a DG manufacturer, freight forwarder, or warehouse operator, getting placarding wrong can mean rejected shipments, regulatory fines, or delayed cargo. This guide walks through each of the nine hazard classes, the exact placard specifications for each, and the placement rules you must follow for containers, vehicles, and packages.
Placard Requirements by Class: Size, Color, and Minimum Quantity
| Class | Division | Hazard Category | Placard Background Color | Symbol / Text Color | Minimum Placard Size | Placarding Threshold (49 CFR) |
|---|---|---|---|---|---|---|
| 1 | 1.1 | Explosives (mass explosion hazard) | Orange | Black exploding bomb; "1" in bottom corner | 250 x 250 mm | Any quantity (Table 1) |
| 1 | 1.2 | Explosives (projection hazard) | Orange | Black exploding bomb; "1" in bottom corner | 250 x 250 mm | Any quantity (Table 1) |
| 1 | 1.3 | Explosives (fire hazard) | Orange | Black exploding bomb; "1" in bottom corner | 250 x 250 mm | Any quantity (Table 1) |
| 1 | 1.4 | Explosives (minor explosion hazard) | Orange | Black exploding bomb; "1" in bottom corner | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 1 | 1.5 | Explosives (very insensitive) | Orange | Black exploding bomb; "1" in bottom corner | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 1 | 1.6 | Explosives (extremely insensitive) | Orange | Black exploding bomb; "1" in bottom corner | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 2 | 2.1 | Flammable gas | Red | Black or white flame | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 2 | 2.2 | Non-flammable, non-toxic gas | Green | Black or white gas cylinder | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 2 | 2.3 | Toxic gas | White | Black skull and crossbones | 250 x 250 mm | Any quantity (Table 1) |
| 3 | – | Flammable liquid | Red | Black or white flame | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 4 | 4.1 | Flammable solid | Red and white vertical stripes | Black flame | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 4 | 4.2 | Spontaneously combustible | Upper white, lower red | Black flame | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 4 | 4.3 | Dangerous when wet | Blue | Black or white flame | 250 x 250 mm | Any quantity (Table 1) |
| 5 | 5.1 | Oxidizer | Yellow | Black flame over circle | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 5 | 5.2 | Organic peroxide | Upper red, lower yellow | Black flame | 250 x 250 mm | Any quantity for Type B, temp-controlled (Table 1) |
| 6 | 6.1 | Toxic substance | White | Black skull and crossbones | 250 x 250 mm | Any quantity if inhalation hazard (Table 1) |
| 6 | 6.2 | Infectious substance | White | Black biohazard symbol | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 7 | – | Radioactive material | Upper yellow, lower white | Black trefoil; "7" ≥25 mm high | 250 x 250 mm | Any quantity (Table 1) |
| 8 | – | Corrosive substance | Upper white, lower black with white border | Black test tubes pouring liquid on metal and hand | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
| 9 | – | Miscellaneous dangerous goods | White with seven vertical black stripes in upper half | Black "9" underlined in bottom corner | 250 x 250 mm | >1,001 lbs aggregate (Table 2) |
Every dangerous goods shipment must display the correct placard for its primary hazard class. The table below sets out the placard specifications for each of the nine UN hazard classes under the IMDG Code, 49 CFR, and ADR frameworks. Placard dimensions are standardized at a minimum of 250 mm x 250 mm (9.84 inches x 9.84 inches) for transport units, freight containers, and vehicles. Hazard labels on individual packages are smaller, at a minimum of 100 mm x 100 mm (3.9 inches x 3.9 inches).
Sources: IMDG Code classification; 49 CFR §172.504 Tables 1 & 2; ADR placard specifications.
Key placarding rules to know:
- Table 1 materials (Explosives 1.1, 1.2, 1.3; Poison Gas 2.3; Dangerous When Wet 4.3; certain Organic Peroxides 5.2; Poison Inhalation Hazard 6.1; Radioactive 7) require placards regardless of quantity.
- Table 2 materials require placards only when the aggregate gross weight of all Table 2 hazardous materials in the vehicle or container exceeds 1,001 pounds.
- Class 1 explosives have six divisions (1.1 through 1.6), ranked from most dangerous (1.1) to least dangerous (1.6). When a transport unit carries goods of different Class 1 divisions, only the placard for the most dangerous division needs to be displayed.
- Class 7 radioactive placards must display the UN number and, where applicable, the transport index on an orange panel or white background.
For bulk packaging and freight containers, placards must be displayed on all four sides (front, rear, and both sides) of the transport unit or container. Non-bulk packages require hazard labels (100 x 100 mm) rather than full-size placards, but the same class and division specifications apply.
Placement on Vehicles, Containers, and Packages
| Feature | Hazard Labels | Dangerous Goods Placards |
|---|---|---|
| Size | Minimum 100 mm x 100 mm (3.9 inches) | Minimum 250 mm x 250 mm (9.84 inches) |
| Application | Affixed to individual packages, inner packagings, or overpacks | Displayed on transport vehicles, freight containers, tanks, and bulk packagings |
| Purpose | Identifies the hazard of the contents of a specific package | Warns emergency responders and handlers of the overall hazard of the entire transport unit |
| Quantity required | One label per package (or per side for larger packages) | Four for containers (IMDG), three for road vehicles (ADR), four for U.S. vehicles (49 CFR) |
Knowing where to put dangerous goods placards is just as critical as choosing the correct class. Incorrect placement can lead to rejected shipments, port delays, and regulatory fines – and in many cases, the party responsible for applying the placards is not who you might expect. This section covers the exact placement rules for vehicles, freight containers, rail cars, and individual packages under the three main regulatory frameworks: IMDG Code (maritime), 49 CFR (U.S.), and ADR (European road).
Freight Containers and Cargo Transport Units (CTUs)
Under the IMDG Code, a freight container or semi-trailer carrying dangerous goods must clearly display placards one on each side and one on each end of the unit. This means four placards in total for a standard freight container – two on the long sides and one on each end. For any other cargo transport unit (CTU) not fitting the container or semi-trailer definition, the requirement is at least one placard on both sides and on the back of the unit.
Key IMDG placement details to note:
- Placards must be affixed in a vertical orientation to each side wall and each end wall.
- Any placards that do not relate to the contents must be removed – displaying an incorrect placard is a violation.
- For Class 7 radioactive large freight containers carrying unpackaged LSA-I or SCO-I material, four placards conforming to model No. 7D must be displayed on each side wall and each end wall.
- For multiple-compartment tanks containing more than one dangerous substance, placards must be placed along each side at the positions of the relevant compartments. If all compartments carry the same hazard, placards need only be displayed once along each side.
- When subsidiary hazards are present, subsidiary risk placards should be displayed in addition to primary risk placards.
- The UN Number must be displayed in black digits not less than 65 mm high on consignments of packaged dangerous goods exceeding 4,000 kg gross mass with a single UN Number. [source: adrbook.com] This can be placed either below the symbol on the placard or on an orange rectangular panel (minimum 120 mm high x 300 mm wide) adjacent to each placard.
Road Vehicles (U.S. 49 CFR)
Under 49 CFR (U.S. Hazardous Materials Regulations), the general rule is that each bulk packaging, freight container, unit load device, transport vehicle, or rail car containing any quantity of a hazardous material must be placarded on each side and each end.
Specific 49 CFR placement rules include:
- Placards must be securely attached or affixed to the vehicle or placed in a holder.
- They must be clearly visible from the direction they face. The front placarding requirement for a motor vehicle may be satisfied by placing the placard on the front of the truck-tractor instead of – or in addition to – the front of the cargo body.
- Placards must be located clear of appurtenances and devices such as ladders, pipes, doors, and tarpaulins that could obstruct visibility.
- Placards must be located away from any marking (such as advertising) that could substantially reduce its effectiveness, and in any case at least 3 inches (76 mm) away from such markings.
- Placards must be positioned so that dirt or water is not directed onto them from the wheels of the transport vehicle.
- A DANGEROUS placard may be used on a freight container or transport vehicle containing non-bulk packages with two or more categories of hazardous materials that require different Table 2 placards. However, when 1,000 kg (2,205 pounds) aggregate gross weight or more of one category is loaded at one facility, the specific Table 2 placard for that category must be applied.
For flatbed transport vehicles, the placarding requirement on each side and end may be met by placarding a pallet of non-bulk packages on the flatbed, provided the placards are clearly visible from the sides and ends of the vehicle.
Road Vehicles (European ADR)
Under ADR (European Agreement concerning the International Carriage of Dangerous Goods by Road), dangerous goods placards must be affixed to both sides and at the rear of the vehicle. This is three placards for a standard road vehicle – one on each side and one at the rear – compared to the four-placard requirement for freight containers under IMDG.
Additional ADR placement rules:
- For tank-vehicles or demountable tanks with multiple compartments carrying two or more dangerous goods, placards must be displayed along each side at the position of the relevant compartments, and one placard of each model shown on each side at the rear of the vehicle.
- If all compartments carry the same placards, they need only be displayed once along each side and at the rear.
- Where more than one placard is required for the same compartment, they must be displayed adjacent to each other.
- When a tank semi-trailer is separated from its tractor to be loaded on board a ship, placards must also be displayed at the front of the semi-trailer.
- For tanks with a capacity of not more than 3 m³ and for small containers, placards may be replaced by labels (100 x 100 mm) if those labels are not visible from outside the vehicle.
- ADR also requires orange plates (hazard identification panels) to be displayed on the front and rear of vehicles transporting dangerous goods, in addition to the diamond-shaped placards.
Packages vs. Placards: Know the Difference
A common point of confusion is the difference between dangerous goods labels and placards. The two serve different purposes:
Hazard labels are not a substitute for placards, and placards are not a substitute for labels. A freight container carrying dangerous goods packages must have both: hazard labels on each individual package, and placards on the outside of the container.
Responsibility for Applying Placards
Under IMDG Code, the party responsible for making sure that the container displays the correct placards is the Packer – the party that signs the packing certificate. Under ADR, it is the Loader. In both cases, the lorry driver is very rarely responsible for applying placards to a container. The driver is responsible for the requirements that apply to the vehicle itself – such as the ADR orange plate – and for checking that the placards match the details on the dangerous goods note. However, the driver is not expected to know what went into the container or to apply the placards themselves.
In practical terms, the driver is not necessarily the liable party – under ADR, liability generally sits with the party responsible for placarding, though the position varies by jurisdiction; confirm locally because the carrier may rely on information provided by the consignor. The liability sits with the party that packed or loaded the container. For U.S. domestic shipments under 49 CFR, the shipper is typically responsible for making sure proper placarding.
Practical Checklist for Placement
Before a vehicle or container leaves the facility, verify the following:
- Freight containers: Placards on all four sides (front, rear, left, right) – four placards total.
- Road vehicles (U.S.): Placards on each side and each end – four placards total (front may be on tractor).
- Road vehicles (ADR): Placards on both sides and at the rear – three placards total.
- Tank vehicles with multiple compartments: Placards at the position of each relevant compartment along the sides.
- Subsidiary risks: Additional placards displayed adjacent to primary placards.
- UN Number: Displayed in black digits at least 65 mm high where required (IMDG shipments over 4,000 kg). [source: adrbook.com]
- Obstructions: Placards clear of ladders, pipes, doors, tarpaulins, and advertising.
- Remove outdated placards: Any placards not related to the current contents must be removed before departure.
: Printing Standards, Removable vs. Permanent Placards, and Language Requirements
1. What are the official printing and color specifications for dangerous goods placards?
Printing specifications for dangerous goods placards are defined in detail by the major regulatory frameworks: 49 CFR (U.S.), the IMDG Code (maritime), and ADR (European road transport). All three require placards to be durable, color-fast, and clearly legible under a range of environmental conditions. Under 49 CFR §172.519, placards must be made of material capable of withstanding a 30-day exposure to open weather conditions without deterioration or substantial reduction in effectiveness. Tagboard placards must weigh at least 80 kg (176 pounds) per ream of 610 x 910 mm sheets and pass a 414 kPa (60 p.s.i.) Mullen test. Colors must pass a 72-hour fadometer test and a 30-day open weather test. Color tolerance must fall within the approved Hazardous Material Label and Placard Color Tolerance Chart, or match the PANTONE formula guide coated/uncoated specifications exactly. Fading indicates non-compliance. Under the IMDG Code, the minimum placard dimensions are 250 mm x 250 mm. Placards must conform to the specifications in 5.2.1.6.3. UN numbers, where required, must be displayed in black digits not less than 65 mm high. Orange IMDG rectangular panels must measure 120 mm in height and 300 mm in width, with a 10 mm black border. Under ADR, the placard must be a diamond shape with minimum dimensions of 250 mm x 250 mm. The line inside the edge must be parallel and 12.5 mm from the outside of that line to the edge of the placard. The class or division number must be in digits not less than 25 mm high. For Class 7, the placard must have a black line running 5 mm inside the edge. For vehicles with insufficient surface area, dimensions may be reduced to 100 mm on each side. In practice, this means you should source placards from a supplier who can certify compliance with the relevant standard – typically BS5609 for seawater immersion – and verify that colors match the approved tolerance charts. Screen-printed self-stick vinyl is a common durable option that meets IMDG Code requirements.
2. Can I use removable placards, or do they need to be permanent?
Both removable and permanent placards are acceptable, depending on the application. The regulatory requirement is that the placard must be securely attached and clearly visible for the duration of the transport – not that it must be permanent.
Removable self-stick vinyl placards
are screen-printed, self-adhesive, and meet IMDG Code requirements including the BS5609 90-day seawater immersion test. They adhere to most surfaces, can be easily removed leaving little adhesive residue, and are designed for single-trip or temporary applications. Placard holders are not required for these.
Permanent adhesive vinyl placards
use a high-tack acrylic adhesive, also pass IMDG BS5609 requirements, and are designed for longer-term use. However, "removable" adhesives may become permanent beyond approximately six months. Both types typically have a service temperature range of -40°F to +200°F and a minimum application temperature of +40°F.
Tagboard placards
are a non-adhesive, coated board material designed for short-term use with a 60-day outdoor life. They are more economical but require placard holders.
The critical rule
: Under IMDG Code and ADR, once dangerous goods or residues are discharged, all placards, orange panels, marks, and signs must be removed or masked. Removable placards make this process significantly easier and reduce the risk of displaying incorrect placards on a subsequent shipment. For containers that are repeatedly used for the same product, permanent placards may be more cost-effective. For multi-use or multi-product containers, removable vinyl is generally the preferred choice.
3. What language can be used on dangerous goods placards?
The language requirements for dangerous goods placards depend on the regulatory framework and the specific type of placard. Under 49 CFR, text indicating a hazard (e.g., "FLAMMABLE") is not required for most placards, except for Class 7 (Radioactive) and the DANGEROUS placard. If text is used, it may be in a foreign language. However, if a shipment is made in accordance with the IMDG Code (as authorized under §171.12(b)), the hazardous material shipping description, the shipper's certification (declaration), and the container packing certification must be in English. Under the IMDG Code, placards conforming to specifications may contain foreign language inscriptions or text indicating a hazard (e.g., French, Japanese). The symbols, text, and numbers must be printed in black on all labels, except for Class 2.1 (flammable gas) where they may be printed in the color of the receptacle provided contrast is adequate. Under Canadian TDG Regulations, if text is in a language other than English or French, it must include a translation in English or French, and the text must not obscure any symbol or other text on the placard. Additional text in any language may be added to describe the hazard, provided it does not obscure required elements.
In practice
: For international shipments, using wordless placards (symbols and class numbers only, without hazard text) is often the safest approach, as they are universally recognized and avoid language barriers. The symbols and class numbers are standardized under the UN Model Regulations and are understood globally. If you do use text, make sure it does not obscure the required symbols, class numbers, or UN numbers. For documentation, English is typically required for international maritime shipments.
4. Are there special requirements for PVC-free dangerous goods placards?
While "pvc free dangerous goods placards" is a common search term, the regulations do not specifically mandate PVC-free materials. The requirement is about performance, not material composition. Placards must meet the strength, durability, and color-fastness specifications of the applicable regulations (49 CFR, IMDG, ADR). Many suppliers offer vinyl placards that are durable and meet BS5609 requirements for 90-day seawater immersion. Vinyl is the most common material because it is waterproof, flexible, and adheres well to surfaces. However, if you have specific environmental or corporate sustainability requirements, you can request PVC-free alternatives such as polypropylene or polyester-based materials. These are available from some suppliers. The key is to verify that any alternative material still passes the required durability and weather-resistance tests.
5. Where can I find printable dangerous goods placards or dangerous goods placards PDF?
Regulatory authorities and commercial suppliers provide printable dangerous goods placards and dangerous goods placards PDF templates for reference and training purposes. However, for actual shipments, you should never use home-printed placards unless you can absolutely verify that the printing meets all color, size, and durability specifications. Regulatory inspectors can and do reject placards that are faded, off-color, or undersized. For training and reference, you can find printable dangerous goods placards and dangerous goods placards PDF resources from: - PHMSA (U.S. Department of Transportation) – provides guidance and reference materials - IMDG Code publications – include placard specifications and examples - Commercial compliance suppliers – offer downloadable reference charts For actual use, purchase placards from a reputable supplier who can certify compliance with the relevant regulations. Look for placards that are: - Screen-printed or manufactured to meet BS5609 or equivalent standards - Color-matched to the approved tolerance charts - Made of durable material (vinyl, rigid vinyl, or tagboard with holder) - The correct size: minimum 250 mm × 250 mm (9.84 in) internationally; US 49 CFR placards run 273 mm × 273 mm (10.75 in)
6. What is the difference between dangerous goods labels and placards for container ship shipments?
For container ship dangerous goods placards, the placards are the large (250 mm x 250 mm) diamond-shaped signs displayed on the outside of the freight container – one on each side and one on each end (four placards total) under the IMDG Code.
Labels
(100 mm x 100 mm) are affixed to individual packages inside the container. Both are required: labels on each package, and placards on the outside of the container. The placards communicate the overall hazard of the container's contents to port workers, stevedores, and emergency responders. The labels communicate the hazard of each individual package to handlers.
7. Who is responsible for applying and removing placards?
Under IMDG Code, the Packer (the party that signs the packing certificate) is responsible for making sure the container displays the correct placards. Under ADR, it is the Loader. The driver is generally not responsible for applying placards to the container, but is responsible for checking that the placards match the dangerous goods note and for making sure the vehicle itself displays the required orange plates. Under 49 CFR, the shipper is typically responsible. Crucially, all placards, orange panels, marks, and signs must be removed or masked once the dangerous goods or residues have been discharged. This is to prevent a container from being incorrectly identified on its next journey. Removable placards make this task much easier and more reliable.
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Related Guides
What each class covers, port acceptance and shipping limits.
Classes 2-9 FCL/LCL export service with carrier pre-approval.
Lane-specific DG rules for the China-Europe sea route.
Classes 2-9 FCL/LCL export service with carrier pre-approval.
Sources and references
All figures verified from public sources; freight rates marked indicative are confirmed at booking.