Most guidance on chemical labelling tells laboratories to label everything, always, to stay compliant. That is good practice and it is not what the regulation says. The rules distinguish between shipped containers and workplace containers, they contain two exemptions almost nobody cites, and for a laboratory covered by the Laboratory Standard the secondary container requirement does not apply at all. Knowing which of your labelling rules are legal obligations and which are your own policy is the difference between a defensible programme and a well-intentioned one.
At a glance
A shipped container needs six label elements: product identifier, signal word, hazard statement, pictogram, precautionary statement, and the name, address and telephone number of the manufacturer, importer or responsible party. A workplace label needs only the first five, or alternatively the product identifier plus words, pictures or symbols conveying general hazard information. Portable containers for the immediate use of the person who filled them are exempt under 1910.1200(f)(8). Existing labels on incoming containers must not be removed or defaced. And for laboratories under 1910.1450, OSHA has confirmed there is no specific secondary container labelling requirement — the convention is set by your chemical hygiene plan instead.
Shipped containers: the six elements
Appendix C to 1910.1200 is mandatory and it sets out what a label carries. For a container leaving a manufacturer, importer or distributor:
Element | What it is | Note |
Product identifier | The name or number used on the label and matching the safety data sheet | Must match the SDS. This is the linking key between the two documents |
Signal word | Danger or Warning | Only two exist, and only one appears on a label — the more severe of the two if the classification produces both |
Hazard statement(s) | Standardised phrases describing the nature and degree of the hazard | Assigned by classification, not written freely. All applicable statements appear |
Pictogram(s) | The red-bordered diamonds | Nine exist in GHS; OSHA does not adopt the environment pictogram as mandatory. Borders must be red on shipped containers, and a blank red border is not permitted |
Precautionary statement(s) | Prevention, response, storage and disposal advice | Standardised, and Appendix C prioritises them where space is limited |
Supplier identification | Name, address and telephone number of the manufacturer, importer or responsible party | Required on shipped containers only, per C.1.1. This is the element that distinguishes a shipped label from a workplace label |
Where a Department of Transportation pictogram already appears on a shipped container for the same hazard, the Appendix C pictogram is not required for that hazard. And labels must be revised within six months when a manufacturer, importer, distributor or employer becomes newly aware of significant information regarding a chemical’s hazards.
Workplace containers: five elements, or a simpler alternative
1910.1200(f)(6) gives an employer two options for a container in the workplace, and both are compliant:
- The information specified at (f)(1)(i) through (v) — that is, the six shipped-container elements minus the supplier contact details. Five elements. This is the simplest option to defend, because it is the same label the chemical arrived with.
- The product identifier, plus words, pictures, symbols or a combination that provide at least general information regarding the hazards of the chemical. This is the alternative workplace labelling system, and it is where in-house label formats, colour coding and rating systems live.
Either way, workplace labels must be legible, in English, and prominently displayed on the container or readily available in the work area throughout each shift. Information in other languages may be added provided English is also present. And the safety data sheet must be readily available in the work area, because the alternative system relies on it for the specific hazard detail the label does not carry. Our guide to using safety data sheets covers where that sits.
The two exemptions
Immediate use, 1910.1200(f)(8). The employer is not required to label portable containers into which hazardous chemicals are transferred from labelled containers, and which are intended only for the immediate use of the employee who performs the transfer. OSHA has interpreted "immediate use" narrowly: the person who decanted it uses it during that shift, and leaves it for nobody else. A beaker you fill, use and empty within the hour is exempt. The same beaker left on the bench overnight, or handed to a colleague, is not — and at that point it needs a label.
Piping systems, 1910.1200(f)(7). Pipes and piping systems are partially exempt from the label requirement, but personnel must still have a way to identify the contents — colour coding, signs, placards, or another system described in the written hazard communication programme. What you cannot do is leave people with no way to identify what is in a line.
Neither exemption is a licence to leave things unlabelled. The immediate-use exemption in particular is narrower than it sounds and is frequently over-relied on. The practical test is whether you could walk away right now and the container would become an unknown to somebody else. If so, label it.
Laboratories: what actually applies
This is where general labelling guidance goes wrong for our readers, and it is worth stating precisely. 29 CFR 1910.1450(a)(2) provides that the Laboratory Standard supersedes, for laboratories, the requirements of other OSHA health standards in subpart Z — and HazCom sits in subpart Z. What survives for a covered laboratory is 1910.1450(h)(1): labels on incoming containers must not be removed or defaced, and incoming safety data sheets must be maintained and readily accessible.
OSHA has confirmed the consequence directly. Standard interpretations issued in 2012, 2014 and 2015 state that the Laboratory Standard has no specific labelling requirement for secondary containers in a covered laboratory. Laboratories set the convention through the chemical hygiene plan and their standard operating procedures instead. Our guide to the Hazard Communication Standard and what carries over into a laboratory works through the full scope question.
Two things follow, and they pull in different directions. First, do not tell staff that OSHA requires them to label a beaker — it does not, and a reader who checks will find that out. Second, label the beaker anyway, and write the rule into the CHP so it is a documented requirement rather than folklore. An unlabelled container is a disposal problem, an inventory problem and a hazard to the next person regardless of what the regulation says. The point is to know which kind of rule you are enforcing.
One exception worth flagging. A quality control laboratory is often not covered by 1910.1450 at all — the preamble to the Laboratory Standard states that most QC laboratories are not expected to qualify, being adjuncts of production operations. Where that applies, full HazCom labelling including (f)(6) is in force. If your laboratory releases product, assume the workplace labelling requirement applies until you have established otherwise.
Incoming labels: do not remove them
This one is stated the wrong way round in a lot of guidance, including our own previous version of this page. 1910.1200(f)(9) provides that the employer shall not remove or deface existing labels on incoming containers of hazardous chemicals, unless the container is immediately marked with the required information. For a laboratory, 1910.1450(h)(1)(i) states the duty without that conditional clause.
So: do not strip the supplier label off a reagent bottle to make room for your own. If a supplier label has degraded to illegibility, replace it immediately with a label carrying the required information rather than leaving the container ambiguous — and treat a bottle you cannot identify as an unknown, which is a waste question rather than a labelling one.
Adding to a label is different from replacing one. Date received, date opened, owner, and an in-house inventory number are all useful additions and none of them requires disturbing what the supplier put there. Peroxide-forming solvents in particular should carry both a received and an opened date, because the disposal trigger is time-based — our guide to pyrophoric and reactive material handling covers why aged ethers matter.
NFPA, HMIS and GHS are not interchangeable
Most laboratories have more than one system in use, and the numbers run in opposite directions. An NFPA 704 diamond rates 0 to 4 with 4 as the most severe. GHS hazard categories run 1 to 4 with 1 as the most severe. A "category 1" GHS classification and a "1" on an NFPA diamond mean close to opposite things, and they routinely sit on the same shelf.
| NFPA 704 / HMIS | GHS under HazCom |
Scale direction | 0 = minimal, 4 = severe | Category 1 = most severe, 4 = least |
Designed for | Emergency responders arriving at a facility (NFPA); workplace communication (HMIS) | Communicating hazards to the person handling the chemical |
Coverage | Health, flammability, instability, special hazards. Does not address chronic health hazards | Acute and chronic health hazards, physical hazards, and environmental hazards where adopted |
Permitted on a workplace label? | Yes, OSHA allows it — but not on its own | Yes, and it is the simplest option to defend |
The condition | Must be accompanied by the product identifier and general information on all hazards. Any hazard the rating system does not address must be communicated by words, pictures or symbols in addition | No supplementary system required |
That last row is the part almost nobody states. OSHA permits NFPA and HMIS for workplace labelling, and OSHA also says these rating systems do not directly correlate with HazCom classifications, and that hazards not addressed by the rating system — chronic health hazards being the example given — must be communicated by other means in addition to the rating. A diamond alone is not a compliant workplace label. If you use one, it needs the product identifier and something covering what the diamond cannot express.
What changed in the 2024 HazCom update
The label-specific changes, since the wider update is covered in our HazCom guide:
- Small container provisions. The rule introduced options for containers too small to carry a full label. The mechanism is that the immediate outer package carries the full label information required by (f)(1), that label must not be removed or defaced, and the outer package must state that the small containers inside are to be stored in it when not in use. Threshold volumes apply — confirm them against the standard before writing a procedure around them.
- Bulk shipment labelling. Labels may be placed on the immediate container or accompany it via shipping papers, bills of lading or electronic means, provided the information is immediately available in printed form at the receiving end.
- Released for shipment. A newly defined term addressing labelling obligations for product already packaged and awaiting shipment when new hazard information emerges.
- Date of label revision. Additional provisions around recording when a label was revised.
On dates, be careful what you read. OSHA extended all the HCS 2024 compliance dates by four months in January 2026. The current dates are May 19 2026 for substances and November 19 2027 for mixtures for manufacturers, importers and distributors; November 20 2026 and May 19 2028 respectively for employers. A great deal of published material — including articles written well after the extension — still carries the original schedule.
Label template
Copy this section to build your label. Adapt the format; the elements are what matter.
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WORKPLACE LABEL — full-element format, option (f)(6)(i) PRODUCT IDENTIFIER: [name exactly as it appears on the SDS] | SIGNAL WORD: [Danger OR Warning — one only] | PICTOGRAMS: [as classified] | HAZARD STATEMENTS: [all applicable, standardised wording] | PRECAUTIONARY STATEMENTS: [prevention / response / storage / disposal] WORKPLACE LABEL — alternative format, option (f)(6)(ii) PRODUCT IDENTIFIER: [name matching the SDS] | HAZARDS: [words, pictures or symbols covering ALL hazards, including any the rating system does not address] | SDS LOCATION: [where, accessible on every shift] IN-HOUSE ADDITIONS — not required, recommended Concentration or dilution | Solvent or matrix | Date prepared or decanted | Date received and date opened (mandatory in practice for peroxide formers) | Prepared by (initials) | Inventory or barcode number | Expiry or re-check date DO NOT Remove or deface a supplier label on an incoming container. Use "Acid", "Solvent", "Waste" or a formula alone as an identifier. Rely on a non-standard abbreviation. Apply a new label over an old one. Rely on an NFPA or HMIS diamond by itself. WASTE CONTAINERS The words "Hazardous Waste" · the contents, in full chemical names with approximate proportions · the accumulation start date · the generating laboratory. Waste labelling sits under RCRA rather than HazCom and has its own requirements — check with EHS. |
Secondary container checklist
- Product identifier that matches the SDS. Not an abbreviation, not a formula alone, not a project code.
- Hazard information — either the full element set, or words, pictures or symbols covering all hazards.
- Concentration, where the container holds a solution rather than a neat reagent.
- Date prepared, and the preparer’s initials.
- Legible, in English, and positioned so it is readable without picking the container up.
- Label material and adhesive suited to the contents and the conditions — solvent-resistant where solvents are handled, cryo-rated where containers go into a freezer, autoclave-rated where they go into a cycle.
- Not obscured by tape, another label, or the way the container is stored.
- Replaced rather than overwritten when the contents change. Our guide to performing a laboratory quality audit covers building label checks into a periodic inspection.
Resources and further reading
- 29 CFR 1910.1200 — Hazard Communication — paragraph (f) covers labels: (f)(1) shipped containers, (f)(6) workplace labelling, (f)(7) piping, (f)(8) immediate use, (f)(9) not removing incoming labels, (f)(10) legibility and English.
- 1910.1200 Appendix C — Allocation of Label Elements (Mandatory) — the element list, the supplier identification requirement at C.1.1, and the precautionary statement prioritisation rules.
- The standard on eCFR — consolidated current text, for citing a specific paragraph.
- SCHC information sheet: workplace labels (PDF) — a clear two-page account of the standard and alternative workplace labelling systems and the limits of rating systems.
- What GHS labels mean to workers — our pictogram and element primer, and safe storage of flammable solvents for the storage side that labelling supports.
- Drain disposal of chemicals — waste labelling connects directly to what may and may not be disposed of, and the never-drain list starts with knowing what is in the container.
This article was produced under Lab Manager’s AI Editorial Guidelines
