An MSDS, now called a Safety Data Sheet (SDS), is a detailed document that communicates the hazards of a chemical product and explains how to handle, store, and respond to emergencies involving it safely. Every hazardous chemical used in a workplace is required to have one. The sheets are produced by chemical manufacturers, importers, or distributors and passed along to any business whose employees will work with the product.
From MSDS to SDS
If you’re searching for “MSDS,” you’re likely encountering an older term. Material Safety Data Sheets (MSDSs) were the original format, but OSHA revised its Hazard Communication Standard in 2012 to align with the Globally Harmonized System (GHS), an international framework for classifying and labeling chemicals. The updated documents are simply called Safety Data Sheets, and all U.S. employers were required to fully transition to the new format by June 1, 2016. The core purpose hasn’t changed, but the new format standardized the layout into 16 sections so that every SDS looks the same regardless of the manufacturer or country of origin.
The Core Purpose
An SDS exists to protect the people who come into contact with a hazardous chemical. It does this by answering a few critical questions: What is this substance? What can it do to your body or the environment? How should you protect yourself while using it? And what should you do if something goes wrong, like a spill, a fire, or accidental exposure?
The information serves several audiences at once. Workers handling the chemical daily need to know what protective equipment to wear. Emergency responders arriving at a spill need to know whether the substance is flammable, corrosive, or toxic, and what extinguishing methods are safe. Workplace safety professionals use the data to set ventilation requirements and exposure limits. Even physicians treating someone after accidental exposure rely on SDS first-aid guidance to understand the symptoms they should expect and the treatments that apply.
What an SDS Contains
Every SDS follows the same 16-section structure. The first three sections identify the product: its name, the manufacturer’s contact information and emergency phone number, its hazard classification (with standardized warning symbols and signal words like “Danger” or “Warning”), and a breakdown of the chemical ingredients with their concentrations.
Sections 4 through 8 cover what to do when things go wrong and how to prevent them. Section 4 lays out first-aid instructions organized by how the exposure happened: inhalation, skin contact, eye contact, or ingestion. It also lists the most important symptoms to watch for, both immediate and delayed. Section 5 tells firefighters which extinguishing agents work and which ones to avoid, plus any toxic gases the chemical produces when it burns. Section 6 addresses spill cleanup, including personal precautions and containment methods. Section 7 covers safe handling and storage conditions, such as temperature limits and materials the chemical should never be stored near. Section 8 specifies the protective equipment you need, like gloves, respirators, or eye protection, along with established exposure limits.
Sections 9 through 11 get into the science of the substance. Section 9 lists physical and chemical properties: appearance, odor, melting point, boiling point, flash point, flammability, vapor pressure, pH, and viscosity, among others. These details matter practically. A low flash point means the chemical ignites easily. High vapor pressure means it evaporates quickly and you’re more likely to inhale it. Section 10 covers stability, telling you what conditions (heat, static discharge) or incompatible materials could trigger a dangerous reaction. Section 11 describes the toxicological effects, including whether the chemical is a known or suspected carcinogen.
Sections 12 through 16 address ecological impact, disposal guidelines, transportation regulations, regulatory status, and any other relevant information. Notably, sections 12 through 15 are included for completeness but are not enforced by OSHA, since they fall under the jurisdiction of other agencies like the EPA and the Department of Transportation.
Standardized Hazard Symbols
One of the most visible elements on an SDS is the set of GHS pictograms, red-bordered diamond symbols that communicate hazards at a glance. There are nine:
- Exploding bomb: explosive materials
- Flame: flammable substances
- Flame over circle: oxidizers that can intensify a fire
- Gas cylinder: compressed gases under pressure
- Corrosion: chemicals that cause skin burns or corrode metals
- Skull and crossbones: acutely toxic substances
- Exclamation mark: irritants and lower-level hazards
- Health hazard: substances causing serious long-term effects like cancer or organ damage
- Environment: chemicals hazardous to aquatic life
These symbols are identical worldwide, which is the whole point of the GHS system. A worker in Germany looking at an SDS for the same product sees the same pictograms as a worker in Texas.
Employer Obligations
Under OSHA’s Hazard Communication Standard (29 CFR 1910.1200), employers must keep an SDS on file for every hazardous chemical present in their workplace. These sheets must be readily accessible to employees during every work shift, in or near their work areas. Employers can use electronic systems, binders, or other formats, but the key requirement is that no barriers exist to immediate access. If a computer system goes down and that’s the only way employees can view the SDS, that’s a violation.
Employers are also required to train workers on how to read and use SDS information, and to update their hazard communication programs whenever new chemicals are introduced or new hazards are identified.
Penalties for Non-Compliance
Failing to maintain or provide access to Safety Data Sheets is a citable violation under OSHA. A serious violation can carry a penalty of up to $7,000 per occurrence, while willful or repeated violations can reach $70,000 each, with a minimum of $5,000 per willful violation. If an employer is cited and fails to correct the problem within the allowed timeframe, additional penalties of up to $7,000 per day can accumulate. Knowingly falsifying SDS records or related documents can result in fines up to $10,000, imprisonment for up to six months, or both. (These are the statutory figures in the OSH Act; OSHA adjusts penalty amounts periodically for inflation, so current maximums are higher.)
How to Use an SDS in Practice
Most people don’t read an SDS cover to cover. Instead, you go to the section you need. If you’re about to use an unfamiliar solvent, check Section 8 to see what protective gear is required and Section 7 for handling precautions. If someone splashes a chemical in their eyes, go straight to Section 4 for first-aid steps. If you’re figuring out where to store a new product, Sections 7 and 10 tell you the temperature range and which other chemicals to keep it away from.
The 16-section format makes this fast. Once you’ve looked at a few SDS documents, you know exactly where to find what you need, regardless of which manufacturer produced it. That consistency is the single biggest improvement over the old MSDS system, where every manufacturer used a different layout and finding a specific piece of information could take far longer than it should have in an emergency.