A Safety Data Sheet, commonly called an SDS, is a standardized document that provides detailed information about a chemical product's hazards, safe handling requirements, storage conditions, emergency procedures, and other safety considerations. SDSs are an important part of workplace chemical safety because they give employers, employees, emergency responders, and other users access to information they may need to understand the risks associated with a product and use it safely. An SDS typically identifies the hazards associated with a chemical, explains appropriate precautions, and provides guidance for situations such as accidental exposure, spills, fires, and improper handling.

The information contained in an SDS supports decisions throughout the lifecycle of a chemical product. Before a product is introduced into a workplace, safety professionals may use the information to assess potential hazards and determine appropriate controls. Workers may refer to it to understand handling requirements and personal protective equipment. Emergency responders may consult it when dealing with a spill, fire, or exposure incident. Because the same document can serve many different purposes, the structure and accessibility of the information are just as important as the information itself.

Why Safety Data Sheets Exist

Before standardized Safety Data Sheets became widely adopted, chemical hazard information could vary significantly between manufacturers and countries. Documents differed in format, terminology, and level of detail. One supplier might provide a brief document with limited safety information, while another might produce a detailed technical document for a similar product. This inconsistency made it more difficult for workers and emergency responders to quickly locate important information, particularly when they were unfamiliar with a specific manufacturer's documentation.

The Globally Harmonized System of Classification and Labelling of Chemicals, known as GHS, was developed by the United Nations to create a more consistent approach to communicating chemical hazards. GHS provides a framework for classifying chemical hazards and communicating them through standardized labels and Safety Data Sheets. Many jurisdictions have incorporated GHS principles into their own regulations, including the United States, Canada, the European Union, and numerous other countries. Implementation varies between jurisdictions, but one of the most recognizable features of GHS-aligned hazard communication systems is the standardized 16-section format used for Safety Data Sheets.

Standardization makes chemical safety information easier to navigate. When users understand where particular information is located, they can find it more quickly regardless of the product or supplier. A worker looking for first-aid information, for example, knows to consult Section 4. Information about exposure controls and personal protective equipment is found in Section 8. This consistency is particularly valuable in workplaces that manage large chemical inventories from multiple suppliers.

The 16 Standard Sections of an SDS

The standardized SDS format organizes chemical safety information into 16 sections, each covering a specific category of information. While the level of detail can vary depending on the product and applicable regulations, the structure provides a consistent framework that helps users locate the information they need.

1. Identification: Product identifier, recommended uses and restrictions, supplier information, and emergency contact details.

2. Hazard(s) Identification: Classification of the product's hazards, including signal words, hazard statements, precautionary statements, and applicable pictograms.

3. Composition/Information on Ingredients: Chemical identity and relevant concentration or composition information.

4. First-Aid Measures: Symptoms of exposure and recommended first-aid procedures.

5. Fire-Fighting Measures: Suitable extinguishing media and specific hazards that may arise if the product is involved in a fire.

6. Accidental Release Measures: Guidance for responding to spills or releases, including containment, cleanup procedures, and personal precautions.

7. Handling and Storage: Precautions for safe handling and appropriate storage conditions.

8. Exposure Controls/Personal Protection: Occupational exposure limits, engineering controls, and recommended personal protective equipment.

9. Physical and Chemical Properties: Characteristics such as appearance, odor, pH, melting point, boiling point, flash point, and other relevant physical or chemical properties.

10. Stability and Reactivity: Chemical stability, possible hazardous reactions, conditions to avoid, and incompatible materials.

11. Toxicological Information: Potential health effects, routes of exposure, symptoms, and available toxicological information.

12. Ecological Information: Potential environmental effects, including information such as aquatic toxicity and persistence.

13. Disposal Considerations: Guidance related to the safe disposal of the product and its container.

14. Transport Information: Information relevant to the transportation of hazardous materials.

15. Regulatory Information: Safety, health, and environmental regulations that may apply to the product.

16. Other Information: Details such as the date of preparation or revision and other relevant information.

In the United States, Sections 12 through 15 are included to maintain consistency with the standardized GHS format. OSHA does not enforce the content requirements for these sections because environmental, disposal, transport, and certain regulatory matters fall under the jurisdiction of other agencies. Their inclusion nevertheless provides a consistent location for information that may be relevant to environmental professionals, transportation personnel, regulators, and others involved in the management of chemical products.

SDS vs. MSDS: What Changed?

Before the adoption of GHS-aligned hazard communication systems, chemical safety documents were commonly referred to as Material Safety Data Sheets, or MSDSs. The biggest difference between an older MSDS and a modern SDS is standardization. MSDS formats could vary considerably between manufacturers, meaning that information might appear in different locations, use inconsistent terminology, or be presented with varying levels of detail. This made it more difficult for users to quickly compare products or locate critical information when working with unfamiliar documentation.

Modern SDSs follow a standardized 16-section structure in jurisdictions that have adopted GHS-aligned requirements. Hazard communication is also more consistent, using standardized elements such as hazard statements, signal words, and pictograms. In the United States, OSHA revised its Hazard Communication Standard in 2012 to align with GHS principles. Compliance requirements were introduced in phases, resulting in the transition from the older MSDS format to the standardized SDS format.

The term MSDS is still commonly used, particularly by people who have worked with chemical safety programs for many years. However, SDS is now the standard terminology in most GHS-aligned jurisdictions. While the terminology may have changed, the broader purpose remains the same: to provide detailed information that helps people understand and manage the hazards associated with chemical products.

Who Uses Safety Data Sheets?

Safety Data Sheets serve several different groups within and outside an organization. Employers and EHS professionals use SDS information to identify workplace hazards, assess chemical risks, establish safe work procedures, and develop chemical safety programs. This information may also support broader activities such as chemical approval processes, risk assessments, emergency planning, and employee training.

Employees use SDSs to better understand the hazards associated with the chemicals they work with and the precautions required to handle them safely. Emergency responders, including firefighters, paramedics, and hazardous materials response teams, may also use SDS information when responding to chemical spills, fires, or exposure incidents. In these situations, information about hazards, first aid, firefighting, and accidental releases can be particularly important.

Other professionals may rely on SDS information for different purposes. Shipping and logistics personnel can use information from an SDS when assessing handling, transportation, and regulatory requirements, although transport classification itself must be determined according to applicable transportation regulations. Environmental and regulatory professionals may also use SDS information to support reporting, waste management, regulatory compliance, and other chemical management activities.

Legal Requirements for SDSs

Chemical safety regulations vary by country, but many jurisdictions require suppliers to provide Safety Data Sheets for hazardous chemical products. In the United States, OSHA's Hazard Communication Standard requires chemical manufacturers and importers to develop or obtain Safety Data Sheets for hazardous chemicals. Employers must ensure that SDSs are readily accessible to employees for hazardous chemicals present in their workplace and must provide appropriate hazard communication training.

Similar requirements exist under Canada's WHMIS legislation, the European Union's REACH and CLP regulations, and other chemical safety frameworks around the world. Organizations operating internationally should be aware that SDS requirements can differ between jurisdictions. Requirements may vary based on factors such as the applicable hazard classification system, language requirements, product composition, local regulations, and the information that must be included in a document.

For organizations managing chemicals across multiple locations or countries, these differences can add complexity to SDS management. Maintaining access to the appropriate documentation is not simply a matter of storing a single file for each product. Companies may need to consider product revisions, supplier changes, regional requirements, language variations, and whether the SDS available to workers reflects the product currently in use.

Common Misconceptions About SDSs

One common misconception is that an SDS is the same as a product label. While both are part of chemical hazard communication, they serve different purposes. A product label provides a summary of key hazards and precautions intended to be immediately visible on the product or container. An SDS provides significantly more detailed information about the product, including handling and storage requirements, exposure controls, emergency response procedures, physical properties, toxicological information, and other technical details.

Another misconception is that only highly dangerous chemicals require an SDS. SDS requirements generally apply to hazardous chemical products supplied for workplace use, subject to the regulations and exemptions that apply in each jurisdiction. Many common workplace products, including cleaners, lubricants, paints, adhesives, and maintenance chemicals, may require an SDS depending on their classification and intended use.

Perhaps one of the most persistent misconceptions is that SDSs automatically expire after a specific number of years. There is no universal expiration date for Safety Data Sheets. Instead, suppliers are generally required to update an SDS when significant new information becomes available that affects the product's hazard classification or safe handling requirements. Some jurisdictions and organizations may also have periodic review requirements. As a result, the age of an SDS alone does not necessarily determine whether it is current. The more important question is whether the document accurately reflects the product and the latest information relevant to its hazards and safe use.

Key Takeaway

A Safety Data Sheet is a standardized source of detailed information about a chemical product's hazards and safe use. Its purpose extends beyond regulatory compliance. SDS information helps organizations understand the products they bring into their workplaces, establish appropriate controls, train employees, prepare for emergencies, and make informed decisions about chemical safety.

The standardized format used by GHS-aligned systems makes this information easier to locate and interpret, particularly in workplaces that manage products from multiple suppliers. Understanding how to read an SDS and knowing where to find important information is therefore an important part of an effective chemical safety program. Whether the document is being used during a routine task, a chemical risk assessment, or an emergency response, the value of an SDS depends on having accurate information that is accessible to the people who need it.