An SDS, or Safety Data Sheet, is a standardized document that provides detailed information about the hazards of a chemical product and how to handle it safely. Every chemical sold or used in a workplace is required to have one. If you’ve encountered this term at work, in a lab, or on a product label, the SDS is essentially the instruction manual for staying safe around that substance.
What an SDS Contains
Every Safety Data Sheet follows the same 16-section format, standardized internationally through the Globally Harmonized System (GHS). This consistency means that once you learn to read one SDS, you can read any of them, regardless of the manufacturer or country of origin. The 16 sections cover:
- Section 1: Identification. The product name, manufacturer’s contact information, and the recommended uses for the chemical.
- Section 2: Hazard identification. The dangers the chemical poses, including warning symbols, signal words like “Danger” or “Warning,” and specific hazard statements.
- Section 3: Composition. The chemical ingredients and their concentrations, including any impurities that could affect safety.
- Section 4: First-aid measures. What to do immediately if someone swallows, inhales, or gets the chemical on their skin or in their eyes.
- Section 5: Fire-fighting measures. Whether the chemical is flammable, what type of extinguisher to use, and any toxic gases it produces when burning.
- Section 6: Accidental release measures. How to clean up a spill safely, including what protective equipment to wear during cleanup.
- Section 7: Handling and storage. How to safely work with the chemical and where to store it, including temperature limits and incompatible materials to keep it away from.
- Section 8: Exposure controls and personal protection. Workplace exposure limits and what protective gear you need, such as gloves, goggles, or respirators.
- Sections 9–11: Physical and chemical properties (like boiling point, odor, and appearance), stability and reactivity information, and toxicological data on health effects.
- Sections 12–16: Environmental impact, disposal guidelines, transportation rules, regulatory information, and any other relevant details.
For most workers, sections 2, 4, 7, and 8 are the most practically useful. They tell you what’s dangerous, what to do in an emergency, how to handle the product, and what protective equipment you need.
Who Needs an SDS
In the United States, OSHA’s Hazard Communication Standard requires that every workplace where employees handle or could be exposed to hazardous chemicals must keep SDSs readily accessible. This applies broadly. It covers obvious settings like chemical plants and laboratories, but also offices that stock cleaning supplies, restaurants using industrial degreasers, salons working with hair treatment chemicals, and construction sites with adhesives or solvents.
Employers are responsible for maintaining a collection of SDSs for every hazardous chemical on-site and making sure workers can access them during their shifts. “Readily accessible” means you shouldn’t have to track down a manager or unlock a filing cabinet in an emergency. Many workplaces now keep digital copies on a shared computer or through an online SDS management system, though printed binders are still common.
SDS vs. MSDS: What Changed
If you’ve heard the term MSDS (Material Safety Data Sheet), it refers to the older version of the same concept. Before 2012, manufacturers could format these documents however they wanted, which meant the layout, level of detail, and terminology varied wildly between companies. One manufacturer might put first-aid information on page two while another buried it on page eight.
In 2012, OSHA revised its Hazard Communication Standard to align with the GHS, an international framework adopted by dozens of countries. The revised standard renamed the document from MSDS to SDS and required all sheets to follow the same 16-section format. The transition period ended in 2015, so any compliant document produced since then should be labeled as an SDS and follow the standardized structure. If you still see an MSDS at your workplace, it’s outdated and should be replaced with a current SDS from the manufacturer.
How to Find an SDS
Your employer is the first place to check, since they’re legally required to have SDSs for every hazardous product on-site. Beyond that, manufacturers and distributors typically publish SDSs on their websites. A quick search for the product name followed by “SDS” will usually turn one up. Several free online databases also aggregate millions of SDSs, making it easy to search by product name, manufacturer, or chemical ingredient.
SDSs must be provided in English in the U.S. and written in a way that’s understandable to a trained worker, though they can be technical. If you’re struggling to interpret one, focus on section 2 for the big-picture hazards and section 8 for the protective equipment you need. The signal word at the top of section 2 gives you a quick sense of severity: “Danger” indicates more serious hazards, while “Warning” indicates less severe ones.
How to Read the Hazard Symbols
Section 2 of an SDS includes GHS pictograms, which are red-bordered diamond shapes containing a black symbol. There are nine standardized pictograms, and each communicates a specific type of danger at a glance:
- Flame: Flammable gases, liquids, solids, or aerosols.
- Flame over circle: Oxidizers that can intensify a fire.
- Exploding bomb: Explosives or chemicals that can self-react violently.
- Skull and crossbones: Acutely toxic substances that can cause death or serious harm from a single or short exposure.
- Corrosion: Chemicals that cause severe skin burns or serious eye damage, or that corrode metals.
- Exclamation mark: Less severe health hazards like skin irritation, eye irritation, or drowsiness.
- Health hazard (person with starburst on chest): Chronic health effects such as cancer risk, organ damage from repeated exposure, or respiratory sensitization.
- Gas cylinder: Gases stored under pressure.
- Environment (dead fish and tree): Toxic to aquatic life.
A single product can carry multiple pictograms. For example, a solvent might display both the flame symbol (it’s flammable) and the health hazard symbol (long-term exposure could damage organs). The more pictograms on an SDS, the more types of risk you need to manage.
Why an SDS Matters in Practice
An SDS isn’t just a regulatory checkbox. In a spill or exposure incident, it tells emergency responders and poison control exactly what they’re dealing with, including the specific chemicals involved and their concentrations. Hospital staff treating someone for chemical exposure will often ask for the SDS to guide treatment decisions.
For everyday work, the SDS tells you things that aren’t obvious from the product label. A cleaning solution might seem harmless, but its SDS could reveal that mixing it with another common cleaner produces toxic gas, or that prolonged skin contact causes chemical burns. The storage section might warn you that a product becomes unstable above a certain temperature, something you’d want to know before leaving it in a hot warehouse. Taking a few minutes to review the SDS for chemicals you work with regularly is one of the simplest ways to avoid preventable injuries.