This guide is for procurement officers, EHS coordinators, and facility managers who are responsible for evaluating new chemical products, training staff, or responding to spill and exposure incidents. If you have a binder full of SDS sheets that nobody has ever been trained to read, this is where you fix that.
Most facilities are in compliance with the possession requirement — they have an SDS for every product. Few are in compliance with the use requirement. OSHA’s Hazard Communication Standard (29 CFR 1910.1200) does not ask you to collect documents. It asks you to operate a system in which workers who handle chemicals can access and understand the hazard information for those chemicals. The binder is a means to that end, not the end itself.
The HCS 2024 final rule (May 2024), aligning with GHS Revision 7, did not relax that standard. If anything, the updated SDS requirements put more specific data obligations on manufacturers and importers — which means the SDS arriving with your next chemical shipment should contain more actionable information than what you have in your binder today. This guide walks every section of a GHS 16-section SDS, tells you what the section contains, what to look for, what a red flag looks like, and what decision that section supports.
The Premise: Three Jobs a Safety Data Sheet Does
An SDS is not one document — it performs three different functions depending on when you look at it.
Pre-purchase: Before adding a new product to your formulary, a complete SDS review is due diligence. Section 2 tells you the hazard profile. Section 8 tells you what PPE your team will need. Section 15 tells you whether the product is compliant in the states where you operate. Section 13 tells you whether disposal requires a licensed hazardous waste hauler. These four sections alone can kill a purchase decision that looked clean on the product data sheet.
Emergency response and post-incident: When a worker is splashed, inhaled, or contacts a product, Sections 4, 5, and 6 are your emergency protocol. Section 11 may matter to the treating physician. This is not the time to discover the SDS is from 2014 and doesn’t reflect the current formula.
Training: HCS-required training (1910.1200(h)) must cover how to access and read the SDS for the specific chemicals employees will encounter. Pointing to a binder and saying “those are your SDSs” is not training.
The GHS 16-Section Structure
The following table gives the quick-reference view. The full discussion for each section follows.
| Section | Title | Primary Decision It Drives |
|---|---|---|
| 1 | Identification | Is this the right product for this application? |
| 2 | Hazard(s) Identification | What are the acute hazards? Is it appropriate for this workforce? |
| 3 | Composition / Ingredients | Are there restricted or banned ingredients? |
| 4 | First-Aid Measures | What do we do in an emergency right now? |
| 5 | Fire-Fighting Measures | What suppression media does the facility need? |
| 6 | Accidental Release Measures | How is the spill kit configured? |
| 7 | Handling and Storage | Where does this product live in the facility? |
| 8 | Exposure Controls / PPE | What gear does the team need, and what does it cost? |
| 9 | Physical & Chemical Properties | Is VOC content compliant? Flash point? |
| 10 | Stability and Reactivity | What can’t this product touch? |
| 11 | Toxicological Information | Medical surveillance needs; what happens in chronic exposure? |
| 12 | Ecological Information | Spill response in stormwater zones; sustainability assessment |
| 13 | Disposal Considerations | Hazardous waste hauler needed? |
| 14 | Transport Information | Shipping class for inbound freight or inter-facility moves |
| 15 | Regulatory Information | State VOC compliance; Prop 65; SARA Title III |
| 16 | Other Information | Revision date — is this SDS current? |
Section 1: Identification
What it contains: Product name, product number, manufacturer name and address, recommended use, uses advised against, and the supplier emergency telephone number.
What to look for: The recommended use field is the most overlooked. It will say something like “industrial and institutional cleaning of hard surfaces.” If your application is automotive engine degreasing or food-contact surface sanitation and neither is listed, you are using the product off-label. That matters for your liability posture and for regulatory compliance (food-contact use triggers NSF/FDA requirements that a standard cleaning product may not meet).
The emergency phone number must be accessible 24/7. Under HCS, that number must be a real-time, staffed emergency line — not a general customer service number that’s closed on weekends.
Red flag: No emergency number, or a number that routes to voicemail during off-hours. A product claiming “multipurpose” recommended uses with no specific application guidance.
Section 2: Hazard(s) Identification
What it contains: Classification of the substance or mixture under GHS, signal word, hazard statements (H-codes), precautionary statements (P-codes), pictograms, and supplemental hazard information.
This is the section you would post on a break room wall if you could only post one. It is the compressed summary of everything dangerous about the product.
Decoding the signal word: “Danger” indicates a more severe hazard category within the GHS classification system. “Warning” indicates a less severe category. A product labeled “Danger” warrants more scrutiny of what category is driving it.
Decoding the pictograms:
| Pictogram | Meaning |
|---|---|
| Skull and crossbones | Acute oral, dermal, or inhalation toxicity (Category 1–3) |
| Corrosion | Skin corrosion, serious eye damage, corrosive to metals |
| Flame | Flammable liquids, solids, gases, self-reactive substances |
| Exclamation mark | Irritant, skin sensitizer, acute toxicity Category 4, narcotic effects |
| Exploding bomb | Explosives, self-reactive, organic peroxides |
| Gas cylinder | Compressed or liquefied gases |
| Flame over circle | Oxidizers — accelerate fire |
| Health hazard (person silhouette) | Carcinogens, reproductive toxins, target organ effects, respiratory sensitizer |
| Environment | Aquatic toxicity — relevant for spill response |
H-codes are the specific hazard statements (H301 = Toxic if swallowed; H314 = Causes severe skin burns and eye damage; H350 = May cause cancer). Every H-code is standardized globally — you can look any of them up. P-codes are precautionary statements — specific action language (P260 = Do not breathe vapors; P280 = Wear protective equipment).
What to look for: If you see H350 (carcinogen) or H360 (reproductive toxin), the product may trigger medical surveillance requirements under OSHA’s substance-specific standards. If you see H314 or H318 (corrosives, serious eye damage), splash goggles are mandatory — not safety glasses.
Red flag: An SDS with only a signal word and no H-codes. Missing pictograms for a product that clearly has corrosive or flammable properties. The HCS 2024 update requires more complete classification disclosure; an SDS that looks sparse in Section 2 may pre-date proper GHS alignment.
Section 3: Composition / Information on Ingredients
What it contains: For a mixture (which most cleaning products are), this section lists each hazardous component by chemical name, CAS Registry Number, and approximate percentage by weight (or a concentration range if the supplier claims trade secret).
What to look for: CAS numbers let you cross-reference against restricted ingredient lists. Check for:
- 1,4-Dioxane: A byproduct of ethoxylation used in surfactant production, not an intentional ingredient, but a recognized contaminant. New York State has a limit for cleaning products; California has reporting requirements. It won’t be listed as an intentional ingredient — its presence requires third-party testing to confirm, but some forward-looking SDSs disclose it.
- PFAS (per- and polyfluoroalkyl substances): Present in some surfactants, floor finishes, and degreasers. Multiple states have enacted or are enacting PFAS-in-product bans. If the SDS lists any fluorinated surfactants or the product is a high-gloss floor finish with slip resistance, ask the manufacturer directly.
- TSCA Section 6 restricted substances: Trichloroethylene (TCE) is effectively banned for most vapor degreasing uses under the December 2024 EPA rule. If a degreaser SDS lists TCE in Section 3, the product is non-compliant for most uses immediately.
- Methylene chloride (DCM): Banned from consumer use by EPA; restricted commercial uses under TSCA Section 6. If it’s in Section 3, you need legal guidance before using the product.
Trade secret ranges: Under HCS, a manufacturer may claim trade secret status for a specific concentration and report a range instead (e.g., “5–30%”). This is allowed but must be justified. The CAS number, however, must still be disclosed unless the identity itself is the trade secret, in which case a hazard statement must still appear. An SDS that says “proprietary surfactant blend, no CAS” with no further information is noncompliant.
Red flag: No CAS numbers at all. No percentages or ranges. “Confidential” listed for every component. An SDS for a solvent-heavy product that lists only “proprietary solvents.”
Section 4: First-Aid Measures
What it contains: First-aid instructions broken down by route of exposure: eye contact, skin contact, inhalation, and ingestion. It also describes most important symptoms and effects, and notes whether immediate medical attention is required.
What to look for: Does the guidance require water flushing for a set duration (e.g., “flush eyes with water for 15–20 minutes”)? Does it call for an emergency eyewash station to be immediately available? If the answer is yes to either, that has physical plant implications — the eyewash station has to be within 10 seconds travel time from the work area under ANSI Z358.1.
Note whether medical attention is recommended even if symptoms are not apparent. Some corrosives and organophosphates have delayed effects.
Pre-positioning this information: The first-aid section should be accessible to anyone who might respond to an incident — not just to whoever holds the SDS binder key. Consider laminating the Section 4 information from high-risk products and posting it at point of use.
Red flag: “Seek medical attention” with no specifics. No breakdown by route of exposure. No indication of whether to induce vomiting for ingestion (many chemicals instruct explicitly NOT to induce vomiting).
Section 5: Fire-Fighting Measures
What it contains: Suitable extinguishing media, extinguishing media that is not suitable, specific hazards from combustion (including toxic gases produced), and protective equipment needed for firefighters.
What to look for: Unsuitable extinguishing media matters. A product that specifies “do not use water” or “do not use high-pressure water” changes your facility’s suppression strategy. Combustion byproducts matter — some chlorinated compounds produce hydrogen chloride or phosgene gas when burned; some nitrogen-containing chemicals produce NOx.
Red flag: No listing of combustion products. “Not applicable — product is not flammable” for a product with a flash point below 100°F (this is an inconsistency that warrants a call to the manufacturer).
Section 6: Accidental Release Measures
What it contains: Personal precautions for the responder, environmental precautions, methods for containment and cleanup, and any reference to other sections.
What to look for: This section tells you what should be in your spill kit for this product. Does it require inert absorbent (no sawdust for flammables or oxidizers)? Does it require preventing entry to drains or waterways? Does it call for specific neutralizers? What personal protective equipment does the responder need?
Environmental precautions often include language about avoiding release to sewer or surface water. If the product has aquatic toxicity (referenced in Section 12), this isn’t hypothetical — a spill at a floor drain that connects to a storm system is a reportable release in many jurisdictions.
Red flag: “Absorb with standard adsorbent” for a product with oxidizer or corrosive classification. No mention of drain or waterway protection for a product with aquatic toxicity.
Section 7: Handling and Storage
What it contains: Precautions for safe handling (ignition sources, ventilation, hygiene practices), conditions for safe storage (temperature ranges, humidity, light exposure), incompatible materials for storage, and any specific requirements.
Read this before you decide where to store the product. This section will tell you:
- Whether the product requires a flammables cabinet (required if flash point is low enough to classify as flammable under HCS/OSHA)
- Whether it must be kept away from oxidizers, acids, or bases
- Whether temperature control is required (e.g., “store above 40°F” or “do not store above 75°F”)
- Whether the product degrades in UV light or on metal shelving
Incompatibility with common co-stored products is the most frequent storage violation. A quaternary ammonium disinfectant and a strong acid cleaner should not be adjacent. An oxidizing product should not be stored near organic materials or reducing agents.
Red flag: Temperature requirements your storage area can’t meet. Incompatibility with products you already store in the same cage or room.
Section 8: Exposure Controls / PPE
What it contains: Occupational exposure limits (OELs) for listed components, engineering controls, individual protection measures (respirators, eye protection, skin/hand protection, body protection, hygiene practices).
This is the section that drives PPE purchasing decisions. See the companion guide PPE Requirements from SDS Data: Translating the Hazard Section into Real Gear Choices for the full glove-material and respirator selection process.
Understanding the OELs:
- OSHA PEL (Permissible Exposure Limit): The legal floor. Derived from 1971 standards; widely regarded as outdated for many substances.
- ACGIH TLV (Threshold Limit Value): Published by the American Conference of Governmental Industrial Hygienists. More frequently updated, often more stringent than the PEL, not legally binding under federal OSHA but widely used as the practical standard.
- Manufacturer recommended OEL: May appear on SDS when no OSHA PEL or ACGIH TLV has been set. Not legally binding, but the manufacturer’s disclosure of their own limit is meaningful.
Engineering controls are not optional: The SDS hierarchy for exposure control is engineering first (local exhaust ventilation, enclosure, isolation), then administrative, then PPE. If Section 8 says “use with adequate ventilation,” that is not satisfied by opening a window in a room with no mechanical exhaust.
Red flag: No OEL data for any ingredient despite a product with recognized hazardous components. Missing PPE recommendations entirely. PPE listed as “none required” for a product classified as a corrosive or sensitizer.
Section 9: Physical and Chemical Properties
What it contains: Appearance, odor, odor threshold, pH, melting/freezing point, boiling point, flash point, evaporation rate, flammability limits, vapor pressure, vapor density, relative density, water solubility, partition coefficient, auto-ignition temperature, decomposition temperature, and VOC content.
What to look for: For facility managers evaluating state VOC compliance, the VOC content value here is the verifiable number. If a product claims low-VOC on its label, cross-check it against what Section 9 actually states in g/L. Multiple states (California, New Jersey, Oregon in rulemaking) have product category limits that you must verify against this value.
Flash point determines whether the product is classified as a flammable liquid under OSHA 1910.106. Below 100°F (37.8°C) is Class I flammable; 100–140°F is Class II or III combustible. This matters for storage cabinet requirements and sprinkler system design.
Vapor pressure drives inhalation exposure risk — a product with high vapor pressure volatilizes readily at room temperature, generating vapor concentration quickly in enclosed spaces.
Red flag: “Not determined” for flash point on a solvent product. No VOC value when you’re purchasing for a regulated state.
Section 10: Stability and Reactivity
What it contains: Reactivity hazards, chemical stability, conditions to avoid (heat, shock, static discharge, etc.), incompatible materials, and hazardous decomposition products.
This is the most explicit “do not mix” section in the entire SDS. It will name the classes of incompatible materials. A bleach-based product will list acids and ammonia as incompatibles. An oxidizer will list organics, reducing agents, combustible materials.
What to look for: Hazardous decomposition products — what does this chemical produce if it burns or decomposes? Chlorine gas? Ammonia? Carbon monoxide? This is critical for confined space entry risk assessment and for fire post-incident investigation.
Red flag: “None known” for a chemically reactive product. No decomposition products listed for a halogenated compound.
Section 11: Toxicological Information
What it contains: Routes of exposure, acute and chronic toxicity data (including LD50 and LC50 values for components), skin corrosion/irritation data, eye damage data, respiratory or skin sensitization, germ cell mutagenicity, carcinogenicity (classified by IARC, NTP, and OSHA lists), reproductive toxicity, target organ effects, and aspiration hazard.
What to look for: Carcinogenicity classifications. IARC Group 1 (known human carcinogen) and NTP “known” or “reasonably anticipated” classifications are the highest concern. OSHA’s carcinogen list is narrower. If a component carries these classifications, medical surveillance programs under OSHA’s substance-specific standards (1910.1000 series) may apply.
Target organ effects — “repeated exposure may cause liver or kidney damage” — drive medical surveillance decisions for workers with chronic exposure.
LD50 and LC50 are the raw toxicity values: lethal dose for 50% of a tested population (oral or dermal) and lethal concentration for 50% of a tested population (inhalation). Lower numbers mean higher acute toxicity. These values are used in classification but also in exposure modeling.
Red flag: No carcinogenicity information despite a product containing formaldehyde-releasing agents or other known sensitizers. Missing target organ data for a product that clearly contains industrial solvents.
Section 12: Ecological Information
What it contains: Aquatic toxicity (acute and chronic), persistence and degradability, bioaccumulation potential (log Kow, BCF), mobility in soil, and other adverse effects.
What to look for: LC50 values for aquatic organisms — specifically fish, daphnia, and algae. If the product is “very toxic to aquatic life with long lasting effects” (EUH411 or H410), a floor drain spill is a potential environmental violation under the Clean Water Act or state surface water rules, not just a cleanup nuisance.
Biodegradability data is relevant for sustainability programs and for downstream wastewater treatment plant compatibility. Some industrial degreasers are not readily biodegradable and create BOD loading at the POTW.
Red flag: No ecological data at all — common in older SDSs. “Not applicable” for aquatic toxicity on a water-soluble product used near drains.
Section 13: Disposal Considerations
What it contains: Description of waste residues, applicable waste treatment methods, disposal method for the product, and container disposal.
This is where you find out if you need a licensed hazardous waste hauler. Under RCRA (Resource Conservation and Recovery Act), a chemical product can be a listed hazardous waste (P-list, U-list, F-list) or a characteristic hazardous waste (ignitable, corrosive, reactive, toxic). The SDS will typically state whether the product or its residues are RCRA-regulated hazardous waste.
If the product is a RCRA hazardous waste, disposal through the municipal wastewater system or general trash is illegal. You need a licensed hazardous waste transporter and a permitted treatment, storage, and disposal facility (TSDF). That cost belongs in your total cost of ownership analysis — not just unit price.
Red flag: “Dispose of in accordance with local regulations” with no RCRA classification guidance. No mention of whether the container is a hazardous waste container after use.
Section 14: Transport Information
What it contains: UN number, UN proper shipping name, transport hazard class(es), packing group (I, II, or III), environmental hazards (marine pollutant), special precautions, and bulk transport information.
For most facility managers, this section matters when receiving inbound freight or when moving bulk quantities between sites. The UN number is the global identifier for the material’s transport hazard. Packing Group I is highest hazard; III is lowest.
If your facility moves chemicals in quantities that would constitute a DOT reportable quantity, the transport information in Section 14 is the foundation of your shipping documentation.
What to look for: Marine pollutant designation — relevant if you ship or receive by sea.
Section 15: Regulatory Information
What it contains: Federal regulations (TSCA inventory status, CERCLA reportable quantities, SARA Title III Section 302/304/311/312/313 reporting requirements), state-specific regulations (California Proposition 65, Massachusetts RTK, New Jersey RTK, Pennsylvania RTK), and international regulatory status.
This is where VOC compliance flags appear for specific states. If a product is subject to California CARB limits or South Coast AQMD Rule 1171 for a specific product category, a well-prepared SDS will note it here. If you operate in multiple states, this section is your first check — though it’s not a substitute for checking the current state rule text.
SARA 313 chemicals (toxic chemical release inventory reportable substances) in the product are listed here. If you use those chemicals above threshold quantities, you have TRI reporting obligations.
Proposition 65 listings appear here — if a component is on the California Prop 65 list, the SDS should note it, and product labeling in California must include the warning.
Red flag: No state regulatory information on a product used in California, New Jersey, or Massachusetts. No TSCA inventory confirmation on a product you’re importing.
Section 16: Other Information
What it contains: Date of preparation, date of last revision, revision number, key or legend for abbreviations, and any other information the preparer considers relevant.
The revision date is the most important data point in this section. An SDS that has not been revised in more than five years is a procurement and compliance red flag. Regulations change. Formulas change. GHS classification revisions require SDS updates. If a supplier’s SDS for a product in your binder is from 2018 and the HCS 2024 rule came out in 2024, that SDS may not reflect current classification requirements, ingredient disclosure rules, or state regulatory listings.
The HCS 2024 rulemaking requires manufacturers and importers to update SDS content to GHS Rev 7 standards by January 19, 2026 for substances and July 19, 2027 for mixtures. You should be auditing your binder against these transition dates and requesting updated SDSs from suppliers proactively.
Red flag: No revision date. A revision date before the most recent GHS revision that affected your product category. A revision date before a major reformulation you know occurred.
Named Scenario: The Procurement Officer and the New Degreaser SKU
A procurement officer at a 3-site regional property management firm is evaluating a new alkaline degreaser concentrate for kitchen hood cleaning. The product data sheet looks strong — 1:8 dilution, biodegradable surfactants claimed, competitively priced. She pulls the SDS before issuing a purchase order.
Section 2 shows signal word “Danger,” H314 (severe skin burns and eye damage), and the corrosion pictogram. This means splash goggles, not safety glasses. The team currently uses safety glasses only at the dilution station. That’s a gap.
Section 3 lists sodium hydroxide at 8–12% and sodium metasilicate at 3–7%. No restricted ingredients, but both are corrosives. The CAS numbers check out.
Section 7 states incompatibility with acids — there’s an acid descaler stored in the same chemical cage at one site. That needs to separate.
Section 8 specifies nitrile gloves as minimum — but also notes that for prolonged contact or higher concentrations, neoprene or butyl rubber is recommended. The team uses disposable nitrile only. For mixing at 1:8 in a sink, that’s marginal — she notes to specify thicker reusable neoprene for the mixing task.
Section 13 states the product is not a RCRA hazardous waste at in-use dilutions, but the concentrate may exhibit corrosive characteristic — confirms with the supplier that rinsate from the mixing process at 1:8 does not require special disposal.
Section 15 shows the product is VOC-compliant under current California CARB limits and lists the VOC value consistent with Section 9 (18 g/L for a product with a 5 g/L pH-exempt category limit — she flags this for the California site and asks the supplier for confirmation on which product category applies).
Section 16 shows revision date of January 2025. Good — it’s current through the HCS 2024 transition.
She approves the purchase with two conditions: updated PPE at the dilution station, and storage separation for the acid descaler.
What Gets Missed: Common SDS Reading Mistakes
Reading only Section 1 and Section 2. The front-page hazard is not the whole picture. Section 10 incompatibilities and Section 13 disposal requirements are where the operational problems live.
Not checking the revision date. An SDS that’s seven years old may not reflect a formula change, a new regulatory listing, or an updated GHS classification.
Treating PPE recommendations as minimums. Sometimes they are. Sometimes they’re suggestions by a manufacturer trying to keep the product sellable. Cross-reference Section 2 hazard classification, Section 3 ingredient toxicity, and Section 8 OELs independently.
Ignoring Section 10 for storage decisions. “Store away from incompatible materials” in Section 7 is vague. Section 10 names the materials. These are not suggestions.
Assuming “trade secret” ingredients can’t be evaluated. Even when specific identity is claimed as confidential, the CAS number and concentration range, or at minimum the hazard statement for that component, must appear. If it doesn’t, the SDS is non-compliant.
SDS Quick-Reference Card: What to Look for in All 16 Sections
| Section | Look For | Red Flag |
|---|---|---|
| 1 – Identification | Recommended use matches your application; 24/7 emergency number | Off-label use; no emergency contact |
| 2 – Hazard ID | Signal word; H-codes for carcinogens/corrosives/sensitizers; pictograms | Sparse classification; no H-codes |
| 3 – Composition | CAS numbers; percentage ranges; no restricted ingredients (TCE, PFAS) | No CAS; “proprietary blend” only |
| 4 – First Aid | Route-specific guidance; eyewash station required? | Generic “seek medical attention” only |
| 5 – Fire-Fighting | Unsuitable media; toxic combustion gases | No combustion products listed |
| 6 – Accidental Release | Spill kit requirements; drain protection language | No drain/waterway precautions |
| 7 – Handling/Storage | Incompatible co-storage materials; temp requirements | Conflicts with current storage setup |
| 8 – Exposure Controls | OEL values; ventilation requirements; PPE categories | Missing OEL; “none required” for corrosives |
| 9 – Physical/Chem | VOC content; flash point; vapor pressure | Missing VOC for regulated states |
| 10 – Stability/Reactivity | Named incompatible materials; decomposition products | “None known” for reactive product |
| 11 – Toxicology | Carcinogen classifications; target organ effects | Missing carcinogenicity data |
| 12 – Ecology | Aquatic toxicity; biodegradability | No data; “not applicable” for water-soluble product |
| 13 – Disposal | RCRA classification; container disposal | No RCRA guidance; vague “dispose per local rules” |
| 14 – Transport | UN number; packing group | Incomplete for large-volume transfers |
| 15 – Regulatory | State VOC compliance; Prop 65; SARA 313 | No state regulatory data for CA/NJ operations |
| 16 – Other | Revision date ≤5 years; version number | No date; pre-2024 for new procurement |
See the companion guide PPE Requirements from SDS Data: Translating the Hazard Section into Real Gear Choices for detailed glove material selection and respirator specification from Section 8 data. See the companion guide Building Your SDS Binder: Organization, Access, and OSHA Requirements for the access and retention compliance program.