Chemical safety data sheet PDF: what every section means and where to get them

Last updated 2026-07-09

What is a chemical safety data sheet, and what does the PDF contain?

A safety data sheet is the official hazard document for a chemical product, and it's the single most information-dense thing your workers can reach during a chemical emergency. Everyone calls it an SDS. Before 2012 it was the MSDS (Material Safety Data Sheet). OSHA's Hazard Communication Standard, 29 CFR 1910.1200, makes manufacturers and importers write one for every hazardous chemical they sell, and makes employers keep those sheets where employees can get to them. ^[1]

The PDF is how workers actually meet an SDS. It prints, it searches, it archives. A compliant SDS PDF follows the Globally Harmonized System of Classification and Labelling of Chemicals (GHS), which OSHA adopted in 2012 and phased in through June 2016. Before that, MSDS formats ran wild. One supplier gave you nine sections, another gave you fifteen, arranged however they liked. Now every compliant SDS PDF uses the same 16 sections in the same order, no matter who made the chemical. ^[2]

The document runs from physical properties (boiling point, flash point, vapor pressure) through first aid, firefighting guidance, spill cleanup, the regulatory lists a substance appears on, and the exposure limits set by OSHA and ACGIH.

Here's what people mix up. The SDS is not the container label, even though HazCom requires both. The label is the quick-reference summary. The SDS PDF is the full technical file behind it.

What are the 16 sections of an SDS PDF and what does each one tell you?

Appendix D to 29 CFR 1910.1200 fixes what goes in each section and the exact order they appear. ^[3] Sections 1 through 11 and 16 are OSHA-enforced. Sections 12 through 15 come from other agencies. Here's the full map:

Section	Title	What it contains
1	Identification	Product name, manufacturer contact, recommended uses, emergency phone number
2	Hazard(s) identification	GHS hazard classification, signal word (Danger/Warning), hazard statements, pictograms
3	Composition / ingredients	Chemical identity, CAS numbers, concentration ranges, trade secret claims
4	First-aid measures	What to do by exposure route: inhalation, skin, eyes, ingestion
5	Fire-fighting measures	Suitable extinguishing media, special hazards from combustion, PPE for firefighters
6	Accidental release measures	Spill containment, cleanup procedures, personal precautions
7	Handling and storage	Safe handling practices, incompatible materials, storage temperature limits
8	Exposure controls / PPE	OSHA PELs, ACGIH TLVs, NIOSH RELs, required engineering controls and PPE
9	Physical and chemical properties	Appearance, odor, pH, flash point, boiling point, vapor pressure, solubility
10	Stability and reactivity	Chemical stability, conditions to avoid, hazardous decomposition products
11	Toxicological information	Routes of exposure, acute and chronic health effects, LD50 / LC50 data
12	Ecological information	Aquatic toxicity, persistence, bioaccumulation (not OSHA-enforced)
13	Disposal considerations	Waste disposal methods, regulatory classification
14	Transport information	DOT, IATA, IMDG shipping classifications and UN numbers
15	Regulatory information	SARA, TSCA, RCRA, state right-to-know listings
16	Other information	Preparation date, revision date, key to abbreviations

Section 8 earns the most use day to day. That's your legal exposure limits and the specific PPE workers need. Section 2 is the first thing to read in an emergency because it stacks every hazard classification in one place.

Sections 12 through 15 sometimes come up thin in older SDS PDFs, because OSHA doesn't enforce all of them (EPA and DOT own several). Don't read a blank Section 12 as proof the chemical is safe for the environment. It usually just means nobody filled it in.

Where can you download a chemical safety data sheet PDF for free?

Start with the manufacturer. Every company that makes or imports a hazardous chemical has to give you an SDS, and nearly all of them post searchable SDS libraries on their websites. Look for an "SDS" or "Product Safety" link in the site footer.

Beyond manufacturer sites, several large repositories pull SDS PDFs from thousands of suppliers:

• OSHA's hazard communication page links to databases and spells out your right to obtain an SDS. ^[1]
• Sigma-Aldrich / MilliporeSigma runs one of the largest publicly searchable SDS libraries online, and it covers more than just their own products.
• ChemWatch offers free SDS searches through GoldFFX.
• MSDSonline (now VelocityEHS) is common among safety managers and has a free tier.
• The NIOSH Pocket Guide to Chemical Hazards is not a full SDS, but it gives you fast exposure-limit data for 677 common chemicals and makes a reliable cross-check. ^[4]

Can't find the SDS PDF for something your employer bought? Under 29 CFR 1910.1200(g)(6), your employer can request it in writing from the manufacturer, and the manufacturer has to provide it. Trade secret protection on an ingredient doesn't get them out of it. They still hand over the SDS with the health and safety information intact, even when the exact chemical identity stays withheld.

For uncommon industrial chemicals, the National Library of Medicine's PubChem (which absorbed the old ChemIDplus) carries toxicological profiles that back up or verify SDS data.

Search by CAS number when you can. Product names drift from one manufacturer to the next. CAS numbers don't.

What does OSHA actually require you to do with SDS documents?

OSHA's rules under 29 CFR 1910.1200 come down to three things: access, training, and a written program. ^[1]

Access. You keep SDS documents readily accessible to employees during every shift, in their work areas. "Readily accessible" means a worker gets to the SDS without asking a supervisor and without leaving the work area. OSHA has accepted electronic SDS systems since the 1990s, with one catch. Go electronic-only and you need a backup for power outages, system crashes, and internet downtime. An OSHA Letter of Interpretation from 2003 said electronic systems pass as long as "employees can immediately obtain the information" and backups exist. ^[5] So keeping printed copies for your most hazardous chemicals is still the safest move.

Training. Employees have to be trained on how to read and use SDS documents before their first exposure to a hazardous chemical, and again when a new hazard shows up. It's part of your broader HazCom training obligation. For what that training has to cover, see our guide to hazard communication.

Written program. You maintain a written Hazard Communication Program describing how you manage the SDS collection, how employees reach it, and how you handle new chemicals. No written program means that's your first gap to close. SafetyFolio's program generator builds the written HazCom structure in about 15 minutes, which beats piecing one together from OSHA's appendices.

OSHA does not make you keep SDS documents forever after a chemical leaves your workplace. But there's a trap. If any employee could have been exposed to that chemical, you keep the SDS for 30 years under the employee exposure records rule, 29 CFR 1910.1020. ^[12] Most small employers miss it.

How do you read an SDS PDF fast in an emergency?

Nobody reads an SDS front to back during a spill. The order that matters when something goes wrong is 2, 4, 6, 8. Memorize those four numbers and you've covered the emergency read.

Start with Section 2 (Hazard Identification). The signal word tells you severity fast: "Danger" is the more severe hazard, "Warning" is the milder one. The pictograms give you the hazard category at a glance.

Jump to Section 4 (First Aid) for the exact exposure that happened: skin, inhalation, eyes, or ingestion. Section 4 tells you whether to flush with water, call poison control, or head straight to the ER. Read the specific route, more than the section heading.

For spills, hit Section 6 (Accidental Release Measures) and Section 8 for the PPE you need before cleanup starts. Never start cleanup without knowing what Section 8 requires.

For a fire, Section 5 tells you whether water is compatible (some chemicals react violently with it) and what suppression agents to use.

That's the whole emergency read. Practice the sequence with your team before an incident, not during one.

One practical tip. Post a laminated one-page "how to read an SDS" card near your SDS binder or kiosk. OSHA's Hazard Communication training materials include a free version of exactly this kind of quick-reference card. ^[6]

What's the difference between an SDS and an old MSDS PDF?

Same information, far more consistent format. That's the short version.

Material Safety Data Sheets were the pre-2012 format, and they had no required structure. A 1990s MSDS from one company ran nine sections while another ran fifteen, arranged differently. Cross-referencing hazards across products was genuinely hard.

When OSHA aligned with the GHS in 2012 (final rule published March 26, 2012, full implementation required by June 1, 2016), the MSDS became the SDS and the 16-section format became mandatory. ^[2] The core content didn't change much. The organization got standardized.

Old MSDS PDFs still float around online, especially for chemicals nobody sells anymore. They're not illegal to keep. They may just not reflect current GHS classifications, revised PELs, or updated health data. If you're leaning on an MSDS dated before 2015, check whether a current SDS exists.

Most SDS PDFs you download today are GHS-compliant 16-section documents. Open one and find 9 sections in no fixed order, and you're looking at a legacy MSDS. That's common for older industrial chemicals and for products from suppliers outside North America who never fully updated their paperwork.

What exposure limits appear in an SDS and which ones actually matter?

Section 8 lists occupational exposure limits, often several from different sources, and they aren't equal. OSHA PELs are the law. NIOSH RELs and ACGIH TLVs are better science. You comply with the first and design your controls around the others.

OSHA PELs (Permissible Exposure Limits) are legally enforceable under 29 CFR 1910.1000 (Tables Z-1 through Z-3). ^[7] Exceed a PEL and OSHA can cite you. The catch is age: most PELs were set in 1971 and never kept pace with toxicology. OSHA itself calls many of them "outdated and inadequate for ensuring protection of worker health." ^[8]

NIOSH RELs (Recommended Exposure Limits) come from NIOSH and are generally more current and more protective than PELs. Not legally enforceable, but better science.

ACGIH TLVs (Threshold Limit Values) are set every year by the American Conference of Governmental Industrial Hygienists and are often the most current numbers available. Not enforceable either, but industrial hygienists lean on them.

The practical call: obey OSHA PELs because they're the law, and build your engineering controls and PPE program off the NIOSH REL or ACGIH TLV, because those protect people better. If your SDS lists only a PEL, cross-check the NIOSH Pocket Guide for a current number. ^[4]

Some substances have OSHA standards of their own that override the general Table Z limits. Benzene (29 CFR 1910.1028), lead (29 CFR 1910.1025), and silica (29 CFR 1926.1153) all carry lower action levels and PELs. The SDS for those chemicals should flag the substance-specific standard. Verify it anyway.

How should you organize SDS PDFs so inspectors and workers can actually find them?

OSHA doesn't dictate an organization system. It requires that employees can immediately reach the SDS during their shift. That leaves room for a few approaches, and the right one depends on your operation. The test is simple: if an inspector names a product and you can't produce its SDS in under two minutes, your system is broken no matter how many files you own.

Physical binder. The classic. One three-ring binder per work area, alphabetical by product name or by CAS number, with an index up front. Works without electricity. Its weakness is drift: it goes stale when you change products, and someone has to actually update it.

Electronic system or shared drive. Folders on a shared network drive, organized by product name, with a master inventory list. Good for multi-site operations that want consistent documentation. You need a printed backup plan under the OSHA interpretation on electronic systems. ^[5]

Commercial SDS software. VelocityEHS, MSDSonline, and Chemscape Safety Technologies keep updated libraries and ping you when a manufacturer revises a sheet. These cost money, typically a few hundred to a few thousand dollars a year depending on chemical count and features. For a shop under 50 products, a binder is usually fine. For hundreds of chemicals across multiple work areas, software pays for itself in time saved.

Every system needs a chemical inventory list (required under HazCom) that maps each chemical to its SDS. That list is what an inspector cross-checks against your shelves.

The thing that trips up small employers: keeping SDS for chemicals you dropped. If a product is gone and no exposure occurred, pull it from the active binder. If there's any chance of past exposure, the 30-year retention rule under 29 CFR 1910.1020 applies. ^[12] Keep a separate archive for discontinued chemicals.

For the full written program around chemical hazards, see our hazard communication guide.

What happens if you don't have an SDS PDF for a chemical OSHA finds during an inspection?

Missing SDS documents are among the most-cited HazCom violations, and the penalties are real money. Hazard communication was OSHA's second most-cited standard in general industry in fiscal year 2023, with 2,485 violations. ^[9] 29 CFR 1910.1200 lands on OSHA's top-10 list year after year.

The penalty structure is what stings. A serious violation (substantial probability of death or serious harm) carries a maximum penalty of $16,550 per violation as of 2024, and OSHA adjusts these numbers annually. A willful or repeated violation can reach $165,514 per instance. ^[10] A missing SDS for a toxic chemical with exposure risk is exactly what OSHA calls serious.

Inspectors usually find HazCom violations in clusters: missing SDS, incomplete inventory, thin training records. The citations stack fast.

The fix, before an inspector shows up, is boring and effective. Walk your facility. List every chemical product present, including the cleaning supplies and lubricants everyone forgets. Verify you hold a current SDS PDF for each one. Missing any? Request them from the manufacturer or download them from the manufacturer's portal that day. Easy to do, easy to document.

If a chemical has no SDS anywhere and the manufacturer won't answer, document your written request. OSHA recognizes an employer's good-faith effort to obtain documentation, which can cut a penalty even when the sheet never turns up.

What special rules apply to SDS PDFs for specific hazardous chemicals?

For most common industrial and commercial chemicals, the standard HazCom rules under 29 CFR 1910.1200 cover everything you need. Certain substances layer extra documentation and program requirements on top.

Asbestos (29 CFR 1910.1001): Workers exposed above the 0.1 f/cc action level get medical surveillance records kept for 30 years post-employment. SDS for asbestos-containing materials must sit alongside a written asbestos control program.

Lead (29 CFR 1910.1025): Blood lead monitoring, medical removal protection, and recordkeeping that goes well past what the SDS alone documents.

Laboratory chemicals: 29 CFR 1910.1450 covers labs specifically and requires a Chemical Hygiene Plan instead of (or on top of) a standard HazCom program. The SDS requirements are the same. The surrounding rules differ.

Highly hazardous chemicals under PSM (29 CFR 1910.119): Store threshold quantities of a substance on OSHA's PSM list (chlorine, ammonia, hydrogen fluoride) and the SDS becomes one piece of a much larger Process Safety Management program. The threshold quantities and the full list live in Appendix A to 29 CFR 1910.119.

Pesticides: Under FIFRA, pesticide labels carry legal requirements that overlap with or add to SDS information. The EPA label is legally binding. The SDS adds technical detail.

For common chemicals like hydrochloric acid, where SDS questions come up constantly, our HCl safety data sheet guide walks an actual SDS section by section.

How do you train employees to actually use a safety data sheet PDF?

OSHA's HazCom standard requires training on how to read and interpret SDS information, more than that the documents exist. ^[1] That distinction has teeth. Showing someone a binder and saying "the SDS are in here" does not meet the requirement.

Good SDS training has parts. Workers need to understand the GHS classification system: what the nine pictograms mean, what "Danger" versus "Warning" signals, and how to read the hazard and precautionary statements in Section 2. They need to know where the SDS for their specific chemicals lives and how to find it fast. And they should practice the emergency read sequence (Sections 2, 4, 6, 8) on the actual SDS PDFs for chemicals they touch.

Practice beats lecture here. Hand a worker the SDS for a chemical they use and ask real questions. What's the PEL? What gloves are required? What do you do if it splashes in your eyes? Can you put a CO2 extinguisher on a fire involving this chemical? Every answer sits in Sections 8, 4, and 5.

For multilingual crews, OSHA does not require SDS documents to be translated, but it does require training in a language and vocabulary workers understand. ^[6] Some SDS platforms offer translated sheets for common languages.

For how HazCom fits your overall calendar, see our OSHA training overview. The OSHA 30 course covers SDS interpretation in its hazard communication module.

Document the training. Keep sign-in sheets, the date, the trainer's name, and the chemicals covered. That record is what protects you during an inspection.

How do you build a written hazard communication program around your SDS collection?

The written HazCom program is the document that ties everything together. It has to describe how you manage the SDS collection, how employees access SDS during their shift, how you handle new chemicals coming in, how labeling stays current, and how training gets done and documented. ^[1]

It doesn't have to be long. A two-page written program satisfies the requirement if it actually describes what your facility does. OSHA's small business resources include a model HazCom template, and several state-plan agencies (Cal/OSHA, Washington's DOSH, others) post their own free online. ^[11]

The chemical inventory list is the underrated part. You need a written or electronic list of every hazardous chemical in the workplace. That inventory is the backbone of the SDS system. It's how you confirm you have an SDS for everything, and it's how an inspector cross-checks your compliance. Walk the facility with a clipboard and write down all of it: the cleaner under the sink, the WD-40 in the maintenance drawer, the paint in storage.

For small employers who want this built fast, SafetyFolio's safety program generator produces a complete written HazCom program, including SDS management procedures and a chemical inventory template, in about 15 minutes. For a shop with nothing in place, that's the fastest compliant path.

Review the written program at least annually and whenever a new significant hazard arrives. Date every revision and keep the prior version on file. OSHA can ask to see revision history.

Wire your SDS system into incident documentation while you're at it. When an exposure happens, the SDS for the chemical involved goes into the incident report file and supports your OSHA 300 log entry.

Frequently asked questions

Can I keep SDS documents only as PDFs on a computer, or do I need paper copies?

OSHA allows electronic SDS systems, including PDF-only ones, as long as employees can immediately access the documents during their shift without barriers. An OSHA Letter of Interpretation from 2003 confirmed this with one condition: a backup system for power or computer failures. Keeping printed copies of your most hazardous chemicals' SDS documents is the cheapest way to satisfy the backup requirement.

How long do I need to keep SDS PDFs after a chemical is no longer used in my facility?

If employees were ever exposed to the chemical, you retain the SDS for 30 years under OSHA's employee exposure and medical records rule, 29 CFR 1910.1020. This one catches many employers off guard. If there was no possible exposure and you can document that, standard retention doesn't require 30 years, but proving zero exposure is hard. The practical move is to keep SDS for discontinued chemicals in a separate archive indefinitely.

What's the difference between a safety data sheet and a technical data sheet?

An SDS (safety data sheet) is a compliance document mandated by OSHA under 29 CFR 1910.1200. It covers hazards, exposure limits, PPE, and emergency response. A technical data sheet (TDS) is a product spec from the manufacturer covering performance properties, application instructions, and specifications. A TDS has no regulatory requirement or standard format. For safety compliance, you need the SDS, not the TDS.

Are there chemicals that don't require an SDS?

Yes. OSHA's HazCom standard exempts several categories: consumer products used in the same way and amount a normal consumer would use them, wood or wood products not processed in a way that releases a hazardous chemical, foods and drugs meant for employees' personal consumption, nuisance particles regulated only for physical hazard, and substances covered by other frameworks like tobacco products and ionizing radiation sources.

What do I do if the SDS PDF for a chemical I bought doesn't exist online?

Under 29 CFR 1910.1200(g)(6), your supplier or manufacturer must provide an SDS on request. Send a written request (email is fine) and keep a copy. No response? Contact the manufacturer directly, even if you bought through a distributor. If the chemical is truly undocumented and possibly hazardous, treat it as an unknown hazardous material until you have documentation, and ask whether you should be using it at all.

Can I use an SDS PDF written in a foreign language for OSHA compliance?

No. OSHA requires the SDS to be available in English, though you can provide translated versions alongside it. For training, OSHA requires instruction in a language workers understand, so Spanish-language or other translated training materials and translated SDS copies are appropriate and sometimes necessary. They supplement the English SDS rather than replace it.

How often does an SDS need to be updated, and how do I know when a manufacturer has revised one?

Manufacturers must update an SDS within three months of learning new significant information about hazards or protective measures. There's no fixed expiration date, but check the revision date in Section 16. Commercial SDS platforms usually alert you to updated sheets. For binders you manage by hand, checking manufacturer portals annually for your most hazardous chemicals is reasonable practice.

What does GHS mean on an SDS PDF?

GHS stands for the Globally Harmonized System of Classification and Labelling of Chemicals, an international framework developed by the United Nations. OSHA adopted it in its 2012 HazCom revision. GHS standardized hazard categories, pictograms, signal words, and the 16-section SDS format across participating countries. When an SDS says 'GHS-compliant,' it follows that structure, which OSHA has required for all new SDS documents since June 1, 2016.

Do SDS requirements apply to small businesses with fewer than 10 employees?

Yes. The HazCom standard under 29 CFR 1910.1200 applies to all employers who use hazardous chemicals, regardless of company size. There are no small business exemptions for SDS requirements. Very small employers get relief in one area only: employers with 10 or fewer employees in low-hazard industries are partially exempt from the OSHA 300 log. That recordkeeping exemption is separate from SDS compliance.

What is the CAS number on an SDS PDF and why does it matter?

A CAS (Chemical Abstracts Service) number is a unique identifier assigned to every distinct chemical substance by the American Chemical Society. On an SDS it appears in Section 3. CAS numbers are the most reliable way to identify a chemical, because product names and synonyms vary widely between manufacturers. Searching for an SDS by CAS number returns more accurate results than searching by trade name. Regulatory databases use them to look up exposure limits and hazard classifications too.

How is an SDS PDF different from an MSDS PDF?

Both convey chemical hazard information. Structurally, MSDSs used a variable format with no standard section order or count, which made them inconsistent and harder to use. SDS documents, required under OSHA's 2012 GHS-aligned HazCom revision, use a mandatory 16-section format in fixed order. If you have an MSDS dated before 2016, check whether a current GHS-compliant SDS exists, because older MSDSs may not reflect current classification standards or updated exposure limits.

Does OSHA require me to have an SDS for gasoline, cleaning products, and other common substances?

Yes, if those products are used in the workplace and meet the definition of a hazardous chemical. Gasoline, many cleaning solvents, degreasers, paints, and adhesives all qualify under HazCom. The consumer product exemption only applies when the product is used in the same manner and frequency as normal household use. A janitor using a cleaning product for eight hours a day exceeds consumer use, so an SDS is required.

What OSHA violations are most common for SDS and hazard communication failures?

The most common HazCom violations OSHA cites are: no written HazCom program, missing SDS for chemicals on site, incomplete chemical inventory lists, thin employee training documentation, and improper or missing container labels. Hazard communication was OSHA's second most-cited standard in general industry in fiscal year 2023, with 2,485 violations. Serious violations reach $16,550 per instance. A walkthrough audit of your SDS collection against your chemical inventory is the fastest way to find gaps before an inspection.

Sources

1. OSHA, Hazard Communication (29 CFR 1910.1200): OSHA's Hazard Communication Standard requires manufacturers to prepare an SDS for every hazardous chemical and requires employers to keep SDS accessible to employees during every shift.
2. OSHA, Hazard Communication Standard Final Rule (published March 26, 2012): OSHA aligned HazCom with the GHS in a final rule published March 26, 2012, with full implementation required by June 1, 2016, mandating the 16-section SDS format.
3. OSHA, 29 CFR 1910.1200 Appendix D, Minimum information for an SDS: Appendix D to 29 CFR 1910.1200 mandates the 16-section SDS format and lists the required content for each section.
4. NIOSH, Pocket Guide to Chemical Hazards: The NIOSH Pocket Guide provides exposure limit data for 677 common industrial chemicals and is a reliable cross-check for SDS Section 8 values.
5. OSHA, Letter of Interpretation on electronic access to material safety data sheets (2003): An OSHA 2003 Letter of Interpretation confirmed electronic SDS systems are acceptable as long as employees can immediately obtain the information and backup systems exist.
6. OSHA, Hazard Communication training and outreach materials: OSHA's Hazard Communication training materials include free quick-reference cards, and OSHA requires training in a language and vocabulary employees understand.
7. OSHA, 29 CFR 1910.1000, Air Contaminants (Table Z-1 through Z-3): OSHA Permissible Exposure Limits (PELs) listed in Tables Z-1 through Z-3 are the legally enforceable airborne exposure limits cited in SDS Section 8.
8. OSHA, Annotated Tables of OSHA PELs: OSHA has acknowledged that many of its PELs, most set in 1971, are 'outdated and inadequate for ensuring protection of worker health.'
9. OSHA, Top 10 Most Cited Standards, Fiscal Year 2023: Hazard communication (29 CFR 1910.1200) was the second most cited OSHA standard in general industry in FY2023, with 2,485 violations recorded.
10. OSHA, Penalties: As of 2024, OSHA's maximum penalty for a serious violation is $16,550 per instance; willful or repeated violations can reach $165,514 per instance.
11. OSHA, Small Business resources: OSHA's small business resources include a model Hazard Communication program template that employers can adapt.
12. OSHA, 29 CFR 1910.1020, Access to Employee Exposure and Medical Records: Employers must retain SDS documents for 30 years for any chemical to which employees were exposed, under the employee exposure records retention rule.
13. United Nations Economic Commission for Europe, Globally Harmonized System of Classification and Labelling of Chemicals (GHS): The GHS is the international framework that standardized the 16-section SDS format and hazard classification categories adopted by OSHA in 2012.