Hazmat Label Guide: Everything You Need to Know – ClassyMoose®
Hazmat Label Guide: Everything You Need to Know

Hazmat Label Guide: Everything You Need to Know

Hazmat Label Guide: Everything You Need to Know

When it comes to shipping or handling hazardous materials (hazmat), safety is not optional, it’s the law. One of the most important parts of hazmat safety is proper labeling.

Whether you're a manufacturer, supplier, or carrier, using the correct hazmat labels is essential to stay compliant with regulations and keep people safe.

In this guide, we’ll break down:

  • What hazmat labels are

  • Why they matter

  • The different classes and label types

  • How to use them correctly

What Are Hazmat Labels?

Hazmat labels are diamond-shaped warning labels placed on packages that contain hazardous materials. These labels communicate the type of hazard involved: whether it’s flammable, toxic, corrosive, radioactive, or otherwise dangerous.

They’re required by regulatory bodies such as:

  • U.S. DOT (Department of Transportation)

  • OSHA (Occupational Safety and Health Administration)

  • IATA (International Air Transport Association) for air shipments

  • IMDG (International Maritime Dangerous Goods Code) for ocean shipments

Why Are Hazmat Labels Important?

  • Safety: Protects workers, emergency responders, and the public from exposure to dangerous materials.

  • Compliance: Avoids fines and legal trouble from failing to meet transportation or workplace safety regulations.

  • Communication: Provides clear, standardized information about the contents and handling requirements.

The 9 Hazard Classes

Hazardous materials are divided into nine classes, each with specific labeling requirements:

Class Hazard Type Example
1 Explosives Fireworks, ammunition
2 Gases Propane, oxygen tanks
3 Flammable Liquids Gasoline, acetone
4 Flammable Solids Matches, magnesium
5 Oxidizers & Organic Peroxides Hydrogen peroxide, bleach
6 Toxic & Infectious Substances Pesticides, medical waste
7 Radioactive Materials Uranium, medical isotopes
8 Corrosives Sulfuric acid, drain cleaner
9 Miscellaneous Hazards Dry ice, lithium batteries

Each class has a distinct color and symbol for easy recognition.

What Does a Hazmat Label Include?

A standard hazmat label contains:

  • Class number (1–9)

  • Hazard symbol (e.g., flame, skull & crossbones)

  • Text description (e.g., "Flammable Gas")

  • Color coding (e.g., red for flammables, yellow for oxidizers)

These labels must be:

  • Durable and weather-resistant

  • At least 100 mm x 100 mm (4” x 4”)

  • Clearly visible on the package

Where to Place Hazmat Labels

  • On at least one side of the package (more if large)

  • Not obscured by other markings or tape

  • Near the UN number or shipping name

For bulk containers or large packages, multiple labels may be required on different sides.

 Tips for Staying Compliant

  • Use only approved labels from certified suppliers

  • Ensure labels match the SDS (Safety Data Sheet) and shipping documentation

  • Train your staff on how to identify and apply labels properly

  • Stay updated on changing regulations (especially for international shipments)

Final Thoughts

Hazmat labeling isn’t just red tape, it’s a critical part of safety and compliance. Whether you’re shipping flammable liquids, handling toxic chemicals, or transporting lithium batteries, proper labeling can prevent accidents, save lives, and protect your business.

📌 Need help sourcing hazmat labels or ensuring your packaging is compliant? Reach out to our team ! We’re here to help you ship safely and stay compliant.

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