The Occupational Safety and Health Administration (OSHA) requires pictograms as part of the Hazard Communication Standard (HCS) to help workers quickly identify hazards. Under the U.S. implementation of the Globally Harmonized System (GHS), there are specific pictograms that must appear on chemical labels and Safety Data Sheets (SDS). This article explains how many pictograms are required, which ones they are, and how they apply in U.S. workplaces.
OSHA And GHS: The Pictogram Requirement
OSHA’s Hazard Communication Standard (HCS) aligns with the GHS to standardize hazard information across products and industries. Section 1910.1200 requires labels and SDSs to reflect the identified hazards through consistent language and symbols. Pictograms provide a visual shorthand that supplements the text, aiding quick recognition of risks such as flammability, health effects, or environmental hazards. In the United States, the pictogram set used under HCS corresponds to the GHS pictograms adopted by OSHA, ensuring compatibility with international classifications.
Which Pictograms Are Required
According to OSHA’s HCS updates, there are nine pictograms that must appear on labels for hazardous chemicals in the U.S. market. These pictograms cover the major hazard classes recognized by GHS and OSHA. The nine pictograms are:
- Exploding Bomb — Explosives, self-reactives, and organic peroxides
- Flame — Flammables, self-heating substances, and pyrophorics
- Flame Over Circle — Oxidizers
- Gas Cylinder — Gases under pressure
- Corrosion — Skin corrosion/burns, eye damage, and corrosion to metals
- Skull And Crossbones — Acute toxicity
- Health Hazard — Carcinogenicity, mutagenicity, reproductive toxicity, respiratory and skin sensitization
- Exclamation Mark — Acute toxicity (harmful), irritants, narcotic effects, and other hazards
- Biohazard — Biological hazards (biohazards)
Note: The Environmental pictogram (Dead Tree and Fish) is widely recognized as part of the GHS set, but OSHA does not require this pictogram on U.S. labels under the Hazard Communication Standard. Environmental hazards are typically addressed through other regulations or programs outside the core HCS labeling requirements in the United States.
Where OSHA Pictograms Appear
These pictograms appear on chemical labels and accompanying hazard statements. The label content must also include the product identifier, supplier information, signal word (e.g., Danger or Warning), hazard statements, precautionary statements, and the pictograms themselves. On Safety Data Sheets (SDS), the same hazard information is organized into sections, with pictograms referenced where appropriate to convey specific hazards.
- Labels: Pictograms appear in a defined block with other required label elements to communicate hazards at a glance.
- SDS: Pictogram references help users locate hazard details in the document, supporting safe handling, storage, and emergency response.
Common Questions And Misconceptions
Several points frequently come up when discussing OSHA pictograms. Understanding them helps ensure compliant labeling and improved worker safety.
- Are all nine pictograms always required for every chemical? Yes, if a substance or mixture meets one or more hazard classes defined by GHS and OSHA, the corresponding pictograms must appear on the label. Some products may require multiple pictograms depending on their hazards.
- Do all products need GHS labeling? Only hazardous chemicals subject to OSHA’s HCS require GHS-style labeling. Household items and nonhazardous products may not require pictograms under OSHA unless they are regulated for other reasons.
- Can a product use alternative symbols? No. OSHA requires the specified GHS pictograms; substitutions or custom symbols are not permitted for standard hazard communication labeling.
- What about environmental hazards? The Environmental pictogram is not mandated by OSHA in the U.S. Blue or green environmental warnings are sometimes communicated through other regulatory channels or labels, but not as a required HCS pictogram.
Compliance Tips For Employers
Maintaining OSHA-compliant pictograms involves several practical steps. The following tips help ensure labels and SDSs stay aligned with current standards.
- Review product hazards: Regularly assess the chemical inventory to identify hazard classes; ensure corresponding pictograms are present on labels.
- Use approved label formats: Adhere to the OSHA/NIOSH and GHS label templates to avoid misinterpretation and noncompliance.
- Update during reformulation: If a product changes composition or hazard classification, update labels and SDSs to reflect new pictograms and hazard statements.
- Train employees: Provide ongoing training on pictogram meanings and their implications for handling, storage, and emergency response.
- Audit and document: Conduct periodic label audits and maintain documentation to demonstrate compliance during inspections.
Impact On Workplace Safety And Compliance
Clear pictograms improve hazard recognition, reduce exposure risks, and support quick, correct actions during spills, exposure, or fires. For OSHA-regulated workplaces, consistent pictogram usage aligns with hazard communication goals, fosters a safety-first culture, and helps avoid penalties from noncompliance. The nine-pictogram standard provides clarity across industries and manufacturers, enabling workers to identify hazards without relying solely on text.
Additional Resources
For the most current requirements and guidance, consult these sources: