Introduction 

Every year, thousands of workers are injured because they misread or ignore labels warning of chemical hazards. One highly publicized incident involved the mislabeling of chemicals in a warehouse, causing workers to mix incompatible compounds, releasing poisonous gases, and triggering immediate evacuation. These incidents led to the development of the United Nations' Globally Harmonized System of Classification and Labeling of Chemicals (GHS), which provides a common system that allows workers to immediately identify chemical risks through a common system of labels and pictograms globally. As GHS Rev. 9 and new Occupational Safety and Health Administration HazCom regulations come into effect in 2024, companies that handle hazardous chemicals must ensure adequate classification, labeling, and staff awareness. In this tutorial, we will explain the meaning of each GHS pictogram and discuss the effect of chemical hazard labels in workplace safety and compliance. You'll understand why it's so important for anyone who works in a warehouse, laboratory, manufacturing facility, or stockroom to know these symbols. 

What is the GHS? 

The Globally Harmonized method of Classification and Labelling of Chemicals (GHS) is a United Nations–developed method to be used internationally to standardize the classification and labelling of hazardous chemicals and communication of associated information globally. The overall objective is to make it easier for workers, employers, transporters, and emergency responders to detect chemical hazards, regardless of country or industry, by using standardized labels, signal words, safety data sheets (SDSs), and pictograms. 

Prior to GHS, countries had varied ways of detecting chemical hazards and communicating the risk. This caused problems for international trade, increased the hazards to workers, and compromised the transport and management of chemicals. To solve this problem, the United Nations created the first edition of GHS, called Revision 1 (Rev. 1), in 2003. Over the years, the system has developed with periodic updates with the latest GHS Revision 9 (Rev. 9). These updates include changes to hazard categories, labeling recommendations, and safety communication guidelines. 

The United States Occupational Safety and Health Administration (OSHA) has included GHS in the Hazard Communications Standard (HazCom 2012) and has continued to update to reflect GHS developments through the OSHA HazCom 2024 update. The rules require chemical makers, importers, distributors, and employers to use standardized warning labels and safety data sheets for dangerous chemicals. 

GHS is now incorporated or harmonized with regulatory frameworks in major parts of the world, such as the United States, European Union, Canada, Australia, Japan, China and many more countries. This global harmonization improves the safety of workers, facilitates international trade in chemicals, and minimizes uncertainty about chemical hazards. 

Importance of Understanding GHS Pictograms 

GHS pictograms are standardized symbols that swiftly and globally communicate chemical risks. "Globally Harmonized System of Classification and Labelling of Chemicals (GHS)." The symbols enable workers to quickly identify hazards such as flammability, toxicity, corrosivity, oxidizers, explosives or health concerns without having to read a full Safety Data Sheet (SDS). This rapid danger recognition can help avoid serious injuries, fatalities, fires, and chemical exposure accidents in fast-paced industrial operations. 

GHS pictograms are particularly important for businesses that often work with chemicals, such as manufacturing, warehousing, oil and gas, pharma, healthcare, agriculture, construction, transportation, labs, and cleaning services. The Occupational Safety and Health Administration says hundreds of workers are injured each year from chemicals owing to danger communication, not enough training, or wrong handling of chemicals. Proper implementation of Hazard Communication Standards saves more than 40 lives and prevents more than 500 accidents and illnesses annually in the United States, according to OSHA estimates. Chemical exposure from accidents remains one of the primary causes of occupational diseases in industries that use industrial solvents, corrosives, insecticides, and flammable compounds. 

GHS pictograms enable workers to make instant safety decisions in emergency scenarios such as spills, leaks, fires, gas releases, or inadvertent exposure. For example, the flame pictogram warns about combustible materials that may ignite in contact with heat. The skull and crossbones represent acute toxicity that may result in serious poisoning or death. The corrosion pictogram is a warning to workers about substances that might cause severe skin burns and eye damage or corrosion to metals. Pictograms are used for rapid identification, improving emergency response times, supporting safer storage practices, and reducing the likelihood of catastrophic accidents. 

The importance of GHS pictograms has grown considerably since the United Nations adopted GHS Revision 1 in 2003 and has been updated through GHS Revision 9. In the United States, OSHA adopted GHS in the Hazard Communication Standard (HazCom 2012) and further aligned standards in the HazCom 2024 update. These regulations are legal requirements for companies to instruct their staff on chemical labels, hazard classification, and GHS pictograms to ensure safe handling of hazardous substances. Failure to comply with OSHA hazard communication rules can lead to hefty fines, regulatory inspections, litigation, worker compensation claims, operational shutdowns, and damage to your reputation. OSHA serious violations of penalties can be thousands of dollars per violation or more. Willful or repeated violations can lead to even larger fines and legal implications. 

GHS pictograms are now utilized in all of the main global economies such as the European Union, Canada, Australia, Japan, and China. Their global standardization helps facilitate international chemical transportation, increases regulatory compliance, reduces worker training costs for multinational operations, and establishes a consistent hazard communication system that benefits safety in workplaces around the world.

GHS Label Changes 

The Globally Harmonized System (GHS) is an evolving system as chemical risks, scientific data, and international safety standards grow. One of the big news items is the update to the Occupational Safety and Health Administration Hazard Communication Standard, or OSHA HazCom 2024 update. This update brings U.S. chemical labeling standards closer to GHS Revision 7 and improves harmonization with international chemical safety regulations. The final rule was published in 2024, and employers, producers, importers and distributors have until July 19, 2026, to comply with the essential elements. 

The HazCom 2024 update has about 12 major changes in chemical classification and labeling rules. New hazard categories and classifications to enhance worker awareness of emerging chemical hazards. These include reclassification of aerosols, desensitized explosives, pressure chemicals, and extended requirements for flammable gases. The changes also better direct for compounds with different hazard classes, which will help make labels easier to read when handling, storing, transporting, and responding to emergencies. 

An important technical advance is the labeling regulations for tiny containers. OSHA has allowed flexibility for containers too small to contain all label information but still requires certain key hazard communication elements like product names, pictograms and signal phrases. Especially laboratories, pharmaceutical packaging, sample containers, and industrial worksites have raised compliance issues in the past due to limited space for labels. The new standards are meant to make things easier to understand, but not at the expense of worker safety.

The revised OSHA standard also enhances consistency between container labels and Safety Data Sheets (SDSs), which should help reduce the inconsistencies that previously caused confusion during inspections and worker training. Employers will have to overhaul written hazard communication systems, retrain workers on the changed label elements, and make sure all chemicals in the workplace are updated with the new classifications by the July 2026 compliance deadline. Failure to comply can result in OSHA violations, fines, increased liability exposure, and operational disruptions during regulatory inspections. 

These changes in labeling do not indicate that chemicals are more or less hazardous. Instead, they provide a more specific and internationally harmonized way to identify, label, and communicate chemical hazards. These industries include healthcare, warehousing, manufacturing, construction, oil and gas, agriculture, and chemical processing. The new GHS labeling rules are designed to make it easier for workers to spot hazards, prevent workplace accidents, and encourage international compliance standards.

Which Chemicals Need Hazard Labels? 

The Occupational Safety and Health Administration's (OSHA) Hazard Communication Standard (HazCom) requires that every hazardous chemical bear a GHS-compliant danger label. This applies to pure chemicals and chemical mixes in the workplace. 

Chemicals usually require Hazard Labels: 

• Gases and flammable liquids. 

• Acids and bases that are corrosive. 

• Poisonous or toxic substances. 

• Carcinogens and reproductive poisons. 

• Reactive chemicals and oxidizers. 

• Compressed gases.  

• Industrial solvents and pesticides. 

• Hazardous substance environment. 

When chemicals can cause harm by inhalation, skin contact, ingestion, fire, explosion, or long-term exposure, hazard labels must be affixed. Even combinations are required to be labeled if the hazardous elements exceed GHS concentration restrictions.

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Role of SDS Section 2 

Label requirements are included in Section 2 of the Safety Data Sheet (SDS), "Hazard(s) Identification." It consists of: 

• GHS danger categories. 

• Required Symbols. 

• Signal words ("Warning" or "Danger"). 

• Statements of Hazard. 

• Precautionary statements. 

What Information is Included in a GHS Label? 

A GHS-certified label may contain the following:

• Product Name. 

• Chemical or Mixture Names. 

• Supplier Details. 

• Hazard symbols. 

• Caution word. 

• Safety and handling instructions. 

The standardized labels allow workers to easily recognize chemical dangers and react properly during handling, storage, spills, or emergencies.

Which GHS Labels Are Currently in Use? 

The Globally Harmonized System (GHS) employs 9 approved hazard pictograms globally to communicate risks of chemicals. Under GHS regulations, all pictograms have the same format: a black symbol on a white backdrop with a red diamond border. These symbols are found on chemical labels and in Section 2 of Safety Data Sheets (SDSs) to help workers rapidly identify dangers. 

Key Points to Note on GHS Pictograms: 

• All GHS pictograms have the same red diamond-shaped border. 

• GHS does not use the yellow triangles, orange symbols, or black squares for danger notification. 

• If a substance has more than one hazard, a label may have more than one pictogram. 

• Globally, pictograms are standardized under the United Nations GHS framework and used by institutions such as the Occupational Safety and Health Administration. 

These pictograms promote safety in manufacturing, healthcare, warehousing, transportation, laboratories, agricultural, and chemical processing industries.

What Do Different Shapes and Colors Mean? 

All danger pictograms are designed in a single standard format created by the United Nations and adopted by the Occupational Safety and Health Administration’s danger communication standard under the Globally Harmonized System (GHS). GHS does not use colored triangles, squares, or rectangles to represent the degree of hazard, as do older chemical labeling systems. 

1. Standard GHS Pictogram Design

Every GHS pictogram has the same format: 

• Border of red diamonds. 

• Simple white background. 

• Black warning symbol in the rhombus. 

• Used worldwide for constant hazard communication. 

2. What the Red Diamond Stands For 

The red diamond border indicates that the chemical is known to be a danger according to the GHS categorization standards. The symbol inside the diamond denotes the precise type of hazard, e.g. 

• Combustibility 

• Toxicity  

• Corrosion  

• Explosive hazard 

• Environmental hazard  

• Health risk 

If one chemical has more than one hazard categorization, it may have more than one pictogram. 

3. GHS Signal Words Explained

Besides pictograms, GHS labels also use signal words to show the degree of the hazard. 

Used for more serious dangers including: 

• Chemicals that are very flammable. 

• Acute oral toxicity. 

• Corrosive. 

• Higher danger level carcinogens. 

• Warning. 

Used for less serious threat categories such as: 

• Irritation of skin or eyes. 

• Toxicity is moderate. 

• Poisonous fumes. 

• Reduced flammability risks. 

• Other Label Elements: GHS Label Elements. 

A GHS-compliant label may also include: 

• Product identifier: Manufacturer/Supplier information. 

• Hazard statements.  

• Precautionary statements.  

• Suggested preventative measures. 

• Advice for Emergency Responders. 

These standardized label elements enable workers to immediately identify dangers, improve emergency response, and ensure OSHA HazCom compliance across a wide variety of industries, including manufacturing, healthcare, laboratories, transportation, warehousing and chemical processing.

How to Read a Full GHS Label 

A fully GHS-labeled product aims to help workers swiftly recognize chemical hazards, risks, and safety measures they must take before handling the substance. Under the Occupational Safety and Health Administration Hazard Communication Standard, all complying with GHS labels have six critical aspects that function together as a cohesive hazard communication system. 

Example of How Workers Read a GHS Label 

If a label indicates: 

• Flame symbol => chemical can burn easily 

• Corrosion symbol → Causes skin and eye burns 

• The signal phrase “Danger” indicates high-severity danger. 

• Hazard statement “Causes severe skin burns” => no direct touch 

• Precautionary statement “Wear protective gloves and eye protection” => PPE necessary. 

Before working with the chemical, the worker should be able to identify the requirement for protective equipment, proper storage, ventilation, and emergency reaction preparedness. 

Why It’s Important to Read the Full Label 

You can’t just read the pictograph. To safely handle chemicals, prevent exposure incidents, limit OSHA violations, and respond properly during spills, leaks, fires, or unintentional exposures, workers must grasp how the six label aspects relate to one another. 

GHS vs NFPA 704 vs. HMIS

Many U.S. workplaces employ several hazard communication systems in combination. GHS labels are required by the Occupational Safety and Health Administration Hazard Communication Standard. NFPA 704 and HMIS are routinely used to communicate safety in the workplace and in emergencies.

Can They Be Used Together? 

Yes, OSHA allows GHS, NFPA 704 and HMIS labels to be used simultaneously as long as they do not give conflicting hazard information. Employers shall train workers to comprehend the systems being utilized in the workplace. 

• OSHA Compliance GHS pictograms. 

• NFPA diamond for first responders. 

• HMIS Rating for Employee Handling and PPE Recommendations. 

Industry-Specific GHS Pictogram Examples 

Different industries are dependent on GHS labels. With the help of these labels, they can identify workplace chemical hazards quickly and improve employee safety. 

• Healthcare: The GHS08 Health Hazard pictogram is usually used by hospitals and pharmaceutical sectors for chemotherapy medications, formaldehyde, and sterilizing chemicals that are associated with carcinogenic or respiratory hazards.   

• Manufacturing: This sector often has the GHS02 Flame symbol displayed near machinery, solvents, paints, fuels, and aerosol goods that have flammability dangers.   

• Education: In school and university laboratories, the GHS05 Corrosion pictogram for acids and corrosive compounds, which can cause serious skin burns and eye damage, is often used during investigations.   

• Agriculture: Farms and pesticide storage facilities may need to employ the GHS06 Skull and Crossbones pictogram for very toxic pesticides and compounds that might cause significant poisoning by inhalation or skin exposure.   

This industry-specific software allows the workers to identify dangers faster, adhere to necessary PPE requirements, and remain in line with OSHA Hazard Communication rules. 

Frequently Asked Questions (FAQs) 

1. What are the 9 GHS pictograms? 

The 9 official GHS pictograms are Exploding Bomb, Flame, Flame Over Circle, Gas Cylinder, Corrosion, Skull and Crossbones, Exclamation Mark, Health Hazard, and Environment. These symbols represent certain chemical dangers as set by the United Nations Globally Harmonized System. 

2. What is the difference between "Danger" and "Warning" on GHS labels? 

The more serious chemical risks are marked "Danger," while the less serious hazard categories are marked "Warning." Both are standard GHS signal terms to swiftly express the seriousness of risk.  

3. Can a chemical have multiple GHS pictograms? 

Yes. If a chemical has more than one hazard such as flammability, toxicity, or corrosion, many GHS pictograms may be assigned to it. 

4. Are GHS labels required by OSHA? 

Yes. The Occupational Safety and Health Administration Hazard Communication Standard require GHS-compliant labeling of hazardous compounds in the workplace. 

Conclusion 

The importance of understanding GHS labels and pictograms for workplace safety, effective hazard communication, and compliance with the revised OSHA HazCom requirements cannot be overstated. Organizations should confirm the following five elements before using or shipping hazardous chemicals- Correct GHS pictograms, Proper signal words ("Danger" or "Warning"), accurate hazard statements, product and supplier identification, and Updated classifications in accordance with current OSHA standards. As the July 2026 deadline for compliance approaches, businesses should also update their SDS and labeling processes. CloudSDS offers digital tools to assist organizations in streamlining GHS labeling, SDS management, chemical inventory tracking, and workplace hazard communication compliance.