An MSDS book is a collection of safety documents, one for every hazardous chemical used in a workplace, organized in a binder or digital system so employees can quickly look up health risks, safe handling procedures, and emergency instructions. The term “MSDS” stands for Material Safety Data Sheet, though the sheets themselves have been officially renamed to Safety Data Sheets (SDS) since 2015. Most people still call the binder an “MSDS book” out of habit, and either term refers to the same thing: your workplace’s central reference for chemical safety information.
What’s Inside an MSDS Book
Each sheet in the book covers a single chemical product. If your workplace uses 30 different chemicals, cleaning agents, solvents, or coatings, the book should contain 30 individual data sheets. The sheets are typically arranged alphabetically by chemical or product name, often with tabbed dividers for each letter to make searching faster.
Every modern Safety Data Sheet follows a standardized 16-section format. The first few sections cover the basics: the product’s identity, its hazards, what’s in it, and what to do in a first-aid situation. Sections 5 through 8 get into fire-fighting measures, spill cleanup, proper handling and storage, and what protective equipment you should wear. The remaining sections cover physical properties, chemical stability, health effects from exposure, environmental impact, disposal guidelines, shipping information, and regulatory details. Sections 12 through 15 are technically non-mandatory under U.S. rules, but most manufacturers include them anyway.
The practical value of this format is that every chemical’s sheet looks the same. If you need to know what protective gloves to wear, you always check Section 8. If someone is exposed and needs first aid, you go straight to Section 4. This consistency didn’t exist under the old MSDS system, where manufacturers could organize the information however they wanted.
Why the Name Changed From MSDS to SDS
In 2012, OSHA updated its Hazard Communication Standard to align with the Globally Harmonized System (GHS), an international framework for classifying and labeling chemicals. One major change was replacing the old Material Safety Data Sheet with the new Safety Data Sheet. The information is largely the same, but the standardized 16-section layout makes it far easier to find what you need in an emergency. Manufacturers and importers were required to provide the updated SDS format by June 1, 2015.
If your workplace still has old-format MSDS sheets for products received before that date, those are considered compliant as long as the manufacturer hasn’t since provided an updated version. But in practice, nearly all chemicals on the market now come with the newer SDS format.
OSHA also issued updates to the Hazard Communication Standard in 2024, with compliance deadlines that were extended in January 2026 to give businesses more time to adjust. During the transition period, employers can comply with either the previous version or the updated standard.
Why Your Employer Is Required to Have One
Federal law under OSHA’s Hazard Communication Standard (29 CFR 1910.1200) requires every employer to keep a safety data sheet for each hazardous chemical used in the workplace. The sheets must be readily accessible to employees during every work shift, in or near their actual work area. “Readily accessible” is a key phrase here: employees should never have to ask a supervisor or manager for permission to view a sheet. OSHA has specifically stated that requiring employees to ask for access could be seen as a barrier, which would violate the standard.
Beyond just having the sheets available, employers must keep them current. Whenever a chemical manufacturer or importer sends an updated SDS, whether with a new shipment or upon request, the employer is responsible for replacing the old version. There’s no specific number of days written into the regulation for making the swap, but the expectation is that you maintain the most recently received version at all times.
Physical Binders vs. Digital Access
OSHA doesn’t require a physical three-ring binder. Safety data sheets can be kept in any form, including electronic databases, as long as employees can access them during their shifts without barriers. Many workplaces have moved to online SDS management systems that let employees search by product name or manufacturer.
There’s an important catch with going fully digital: if your system depends on a computer, tablet, or internet connection, you need a backup plan for power outages or system failures. Employees still need access to the information at all times. Some workplaces keep a printed binder as a backup alongside their electronic system for exactly this reason.
For manufacturers and importers distributing SDS sheets electronically, OSHA requires that downstream users actively opt in to electronic delivery and can opt out at any time. If a business opts out, the manufacturer must send a hard copy with the next shipment. All safety data sheets must be provided at no cost, whether digital or printed. And even when electronic distribution is the norm, a manufacturer must still provide a paper copy upon request.
How to Set Up and Organize One
If you’re responsible for putting together an SDS book for your workplace, start by creating a complete inventory of every hazardous chemical on site. This includes obvious items like industrial solvents and acids, but also everyday products like certain cleaning sprays, paints, adhesives, and even some printer toners. The chemical inventory list effectively serves as your table of contents.
Arrange the sheets alphabetically by product or chemical name and use tabbed dividers for each letter. If your workplace has multiple buildings or departments that use different chemicals, it often makes sense to keep separate binders in each area rather than one massive book in a central location. The goal is speed: someone dealing with a chemical spill or exposure shouldn’t have to walk to another building to find the right sheet.
Review the book regularly. When you stop using a chemical, you can remove its sheet from the active binder, though OSHA’s recordkeeping rules under a separate standard (1910.1020) require you to keep exposure records for 30 years. When you bring in a new product, request the SDS from the supplier before employees start working with it, and add it to the binder immediately.
What Employees Need to Know
OSHA’s Hazard Communication Standard requires employers to train employees on the hazards of the chemicals they work with and, critically, on where and how to access the SDS book. Every employee who handles or could be exposed to hazardous chemicals should know the exact location of the binder or how to log into the electronic system. They should also understand the 16-section layout well enough to find first-aid information, required protective equipment, and spill procedures without fumbling through pages during an emergency.
This training isn’t a one-time event. It needs to happen when employees are first hired, whenever a new chemical hazard is introduced, and whenever the way safety information is accessed changes, such as switching from a binder to an electronic system.