How Many Different Pictograms Are Required by OSHA

Under the U.S. Occupational Safety and Health Administration (OSHA) Hazard Communication Standard (HCS), employers must label hazardous chemicals using the set of pictograms defined by the Global Harmonized System (GHS). This article explains how many pictograms are required, which ones apply to U.S. workplaces, and how to implement compliant labeling across chemical inventories. Understanding the exact pictogram count helps ensure consistent communication of chemical hazards to workers and aligns with federal regulatory expectations.

OSHA’s GHS Pictogram Set

The GHS pictogram set adopted by OSHA comprises nine distinct symbols designed to convey specific hazard categories at a glance. These pictograms are standardized shapes and colors that appear on chemical labels and safety data sheets (SDS). In the United States, OSHA requires the GHS pictogram system as part of the HazCom updates implemented to improve hazard communication and worker safety.

Key takeaway: OSHA uses nine pictograms to communicate the major hazard classes associated with hazardous chemicals, aligning with the broader GHS framework used internationally.

Which Pictograms Are Included in U.S. OSHA Labels

The nine pictograms typically required on OSHA-compliant labels are:

• Exploding Bomb — explosives or extremely reactive substances.
• Flame — flammable materials, including liquids, solids, and gases.
• Flame Over Circle — oxidizers that can intensify combustion or support fire.
• Gas Cylinder — gases under pressure, including compressed and dissolved gases.
• Corrosion — corrosive effects on metals or skin/eye damage potential.
• Skull and Crossbones — acute toxicity, or substances that can cause severe health effects in a single exposure or over time.
• Health Hazard (silhouette with star) — respiratory or systemic health hazards, including carcinogenicity, reproductive toxicity, or organ toxicity.
• Exclamation Mark — less severe health hazards, skin/eye irritation, or acute toxicity of lower severity.
• Environment (dead trees and fish) — aquatic toxicity hazards, included in the GHS but not always required on U.S. labels; verify applicability based on the product and jurisdiction.

In practice, U.S. workplaces using OSHA HazCom standards should ensure that the nine pictograms are present on labels where applicable, with the Environmental pictogram applied only when the product and its labeling determine it is necessary or required by the product’s SDS and regulatory context.

Scope and Applicability

The pictogram requirements apply to hazardous chemicals used, stored, or manufactured in workplaces covered by OSHA. This includes:

• Manufacturers who distribute hazardous chemicals in commerce to U.S. employers.
• Employers who handle, store, or use hazardous chemicals in their operations.
• Products subject to GHS labeling provisions, including mixtures that present one or more hazard classes.

There are exceptions. Some consumer products or household chemicals may not require the full GHS label if they are exempt under OSHA or if they are controlled by other regulatory frameworks. Always consult the current OSHA HazCom standard and the product SDS to determine which pictograms apply.

Implementation and Compliance

To maintain compliance, organizations should implement a labeling system that:

• Displays all applicable GHS pictograms clearly on the label.
• Places standardized signal words, hazard statements, and precautionary statements alongside the pictograms.
• Ensures consistency between the label and the Safety Data Sheet (SDS) for the chemical.
• Regularly reviews products for changes in composition, hazard classification, or regulatory expectations.
• Provides worker training on the meaning of each pictogram and the actions required when encountered.

Training should cover how pictograms map to hazard types, the rationale behind each symbol, and the specific PPE or handling steps required to mitigate risks. Documentation, including an up-to-date inventory of labeled chemicals, helps verify that all applicable pictograms are in place during audits or inspections.

Common Misconceptions and Clarifications

• Misconception: There are more than nine pictograms used in the United States. Clarification: OSHA adheres to the GHS set of nine pictograms for hazard communication, though the Environment pictogram appears in some contexts and is not universally required for all products.
• Misconception: All chemicals require every pictogram. Clarification: Only hazards present in a specific chemical or mixture trigger the need for the corresponding pictograms on the label.
• Misconception: Pictograms alone convey all danger information. Clarification: Pictograms are part of a comprehensive label that also includes hazard statements, precautionary statements, and contact information.

Transition to Digital Resources

In addition to physical labeling, OSHA encourages updated SDSs and digital resources that reflect current hazard classifications. Employers should ensure that electronic copies mirror the pictogram information on labels and remain accessible to workers for reference during daily operations and training.

Best Practices for U.S. Employers

• Audit chemical inventories to confirm that all applicable pictograms are present on labels and SDSs.
• Implement a standardized labeling system across all facilities and suppliers.
• Provide ongoing training focused on pictogram meaning, hazard expectations, and emergency response steps.
• Maintain a process for updating labels when classifications change due to new information or regulatory updates.
• Consult OSHA’s HazCom guidance and the latest GHS revision when in doubt about specific pictogram requirements.

Bottom line: OSHA requires nine GHS pictograms on labels where applicable. The Environment pictogram may apply in some cases, but it is not universally required for all U.S. chemical products. A robust labeling program, combined with employee training and up-to-date SDSs, helps ensure safety and regulatory compliance in U.S. workplaces.