Do SDSs Expire? How Often to Update Your SDS Binder

Ask ten safety managers how often an SDS has to be replaced and you will get "every three years," "annually," and "whenever the manufacturer sends one." Only the last one is close, and even it is missing the part that decides whether you get cited.

Here is the honest answer, and then the part nobody puts in writing: what your compliance actually turns on is narrower than "keep everything current" — and what you do with the sheet you're replacing is governed by a completely different standard.

At a glance: OSHA sets no expiration date on a Safety Data Sheet and no required review interval. The three-month update duty in 1910.1200(g)(5) binds the manufacturer, importer, or whoever prepares the sheet — not the downstream employer. Your duty is to hold the most current sheet you have been given and keep it readily accessible (g)(8). And when a replacement arrives, the old sheet is an employee exposure record under 1910.1020, so you cannot always simply throw it out. Safety Data Sheets do not expire under OSHA. 29 CFR 1910.1200 sets no expiration date and no required review interval; the three-month update duty in paragraph (g)(5) falls on the chemical manufacturer, importer, or the employer who prepares the sheet. The downstream employer must maintain copies and keep them readily accessible during each work shift under paragraph (g)(8), and — per OSHA's interpretation letters — must maintain the most recently received version.

The short answer: they don't expire

There is no shelf life in the standard. Search 29 CFR 1910.1200 for an expiration provision and you will not find one, because the test OSHA applies is not age — it is accuracy. In an April 18, 2008 letter of interpretation OSHA described the data sheet as "a reference document that reflects the most accurate and current information about a specific hazardous chemical (product) that is available at the time that the MSDS is developed," and stressed that it must be a correct reflection of current scientific information "as of the date that the MSDS is prepared." A safety data sheet stops being good when the hazard information behind it moves, not when it turns three.

Which means a 2018 sheet for a product whose formulation and classification have not changed can still be the current sheet. And a sheet issued last year can already be stale if the supplier reclassified the product in the meantime.

On the "three-year rule": the point that matters for a US contractor is simple — it is not in 1910.1200 and never has been. Nothing in the standard sets a review cycle. If someone on your crew is certain the rule exists, they are remembering another jurisdiction or an employer policy, not OSHA. Don't quote it to an inspector, and don't build your program around it.

Who actually owes the update (this is the part that gets misassigned)

Read 1910.1200(g)(5) closely, because the subject of the sentence matters:

"If the chemical manufacturer, importer or employer preparing the safety data sheet becomes newly aware of any significant information regarding the hazards of a chemical, or ways to protect against the hazards, this new information shall be added to the safety data sheet within three months."

The three-month clock belongs to the party that prepares the sheet. For the overwhelming majority of contractors that is the manufacturer or importer — the "employer preparing" case only reaches you if you author SDSs for chemicals you produce. You are not expected to re-evaluate a supplier's toxicology or rewrite their document.

The delivery half is (g)(6)(i): manufacturers and importers must ensure distributors and employers get an appropriate sheet "with their initial shipment, and with the first shipment after a safety data sheet is updated." That is the mechanism by which updates are supposed to reach you — attached to the next delivery, automatically.

What your compliance actually turns on

OSHA's July 27, 2015 interpretation is the clearest statement of it. Read it with its scope in view: the letter answers questions about the HCS 2012 changeover, and its safe-harbor sentence is scoped to that transition — an employer maintaining an MSDS "for a product received prior to June 1, 2015" was compliant "unless the manufacturer, importer or distributor has provided a new, HCS 2012-compliant SDS and the employer did not maintain the new SDS."

The durable part is the general rule the letter states alongside it — and OSHA anchors it in the standard itself: "Under paragraphs 1910.1200(g)(1) and (g)(8), employers must have and maintain the most current MSDS/SDSs and make them available to their employees." The letter adds that employers who are not manufacturers, importers or distributors "must maintain the most recently received version of the MSDS/SDS." That is the sentence to internalize, and the structure of the transition-era safe harbor tells you how OSHA thinks about the question generally:

• The gap that actually gets you cited is letting a sheet you were sent fail to reach the library — the updated PDF that landed in a purchasing inbox, or the sheet that came in the box and went in the trash with the packing slip.
• The same letter treats asking as permissive, but pairs it with a supplier obligation: employers "may contact manufacturers, importers or distributors of products they have previously ordered to request new SDSs, and under 29 CFR 1910.1200(g)(6)(iv), the SDS must be provided." The asking is optional; the providing, once you ask, is not.

So the highest-value control is not an annual sweep of the whole binder. It is making sure that every sheet a supplier sends you actually lands in the library — which is a receiving and routing problem, not a document-review problem. Most stale binders are not stale because nobody audited them; they are stale because updated sheets arrived and stopped at someone's desk.

What actually triggers a real update

Since the calendar doesn't drive this, these do:

1. The supplier reissues the sheet. The trigger is a shipment or a notice — file it the day it arrives.
2. The product is reformulated, or you switch to a different grade, concentration, or manufacturer. Same product name on the shelf, different chemistry behind it. New product identifier, new sheet.
3. New hazard information emerges and the preparer adds it within three months (g)(5) — reclassifications, new health endpoints.
4. A regulatory transition reclassifies the product. This is the live one — see below.
5. You add a new chemical, which is a missing-sheet problem, not an update problem: see how to triage the gaps in your library.
6. The sheet is a legacy MSDS. The legacy pre-GHS format was superseded when manufacturers and importers had to meet the 16-section requirement on June 1, 2015 — so an MSDS on your shelf means the current sheet exists upstream and you don't have it.

The one deadline that is on a calendar

The HCS 2024 update aligns the standard primarily with GHS Revision 7, and it is doing exactly what nothing else does: forcing a wave of reissued sheets across products that never changed chemically.

The row that matters for your binder is the upstream one: manufacturers, importers and distributors had to be in compliance for substances by May 19, 2026 (1910.1200(j)(2)(i)), and for mixtures by November 19, 2027 ((j)(3)(i)). That is when an updated sheet should exist.

The employer dates — November 20, 2026 for substances and May 19, 2028 for mixtures ((j)(2)(ii), (j)(3)(ii)) — are a different duty set: updating your own alternative workplace labels under (f)(6), your written program, and additional training for newly identified hazards. They are not SDS deadlines. During the transition you may comply with the 2012 standard, the 2024 standard, or both. The full four-date calendar and why substances and mixtures are staged is in the HCS 2024 compliance calendar.

The practical consequence: the upstream substance deadline has already passed, so a substance sheet still carrying a pre-2024 revision date is worth verifying with the supplier now — not because age invalidates it, but because your supplier's own deadline is behind them.

Two free tools sit exactly here. The HCS 2024 Deadline Lookup asks your role and whether the product is a substance or a mixture and returns the one in-force date with a live countdown, the 1910.1200(j) citation, and a downloadable action plan — you still have to know which side of the substance/mixture line your product falls on. The GHS Rev 7 Transition Wizard maps the old Rev 3 hazard classes to the 2024 ones — the added Desensitized Explosives class (Appendix B.17), the separate new Chemicals Under Pressure class (Appendix B.3.2), the new Aerosols Category 3 within the reworked aerosol provisions, and the flammable-gas 1A/1B/2 split — so you know which markers to look for in Section 2 of a sheet that claims to be updated. The full old-to-new crosswalk is in the GHS Revision 7 converter guide.

For the document-level tells — what a Rev 7 sheet looks like in Sections 2 and 16, and how to spot an obsolete one at a glance — the SDS library gap analysis has the full revision check; there is no reason to repeat it here.

What to do with the sheet you just replaced

This is the step almost every "keep your binder current" article skips, and it is the one that creates a second violation while you are fixing the first. An SDS is an employee exposure record under 29 CFR 1910.1020. You do not get to bin the old one reflexively.

OSHA addressed this directly in an October 1, 1987 letter on retention of superseded sheets. The rule it lays out:

• Same hazardous chemicals? "Employers may discard a material safety data sheet for a mixture, if the new data sheet includes the same hazardous chemicals as the original formulation." A routine reissue that changes formatting or wording but not the constituents does not create an archive obligation.
• Different formulation? "If the formulation is different then the employer must maintain both data sheets for at least 30 years." 1910.1020(c)(5)(iii) lists "material safety data sheets indicating that the material may pose a hazard to human health" in the definition of an employee exposure record, which is why the retention standard reaches them at all.
• The alternative. 1910.1020(d)(1)(ii)(B) says data sheets "need not be retained for any specified period as long as some record of the identity (chemical name if known) of the substance or agent, where it was used, and when it was used is retained for at least thirty (30) years" — in practice, a dated inventory line carrying the chemical name, the site and the dates. The mechanics of the clock and the other exceptions are in 30-year record retention under 1910.1020; the Records Retention Schedule generates keep-until dates with the governing CFR cite per record type.

The same-formulation versus different-formulation split is the part worth remembering: a reissue that changes wording but not constituents creates no archive obligation, while a genuine reformulation obliges you to keep the old sheet — because it documents what your people were actually exposed to.

A review cadence you can defend

None of the following is required by OSHA. It is the rhythm that catches the failures described above, and it is worth labeling honestly in your written program as company practice, not as a regulatory citation:

• On receipt — every time. The controlling habit. A sheet arrives, it goes in the library that day. This one addresses the actual violation OSHA describes.
• On change. New product, new supplier, new grade or concentration, reformulation notice. Treat the product identifier as the key: if it changed, the sheet changed.
• Quarterly — spot-check. Reconcile a slice of the inventory against the library rather than the whole thing. Small enough to actually happen.
• Annually — full reconciliation, containers first, using the gap-analysis method.
• Event-driven — regulatory. The HCS 2024 dates above; run a targeted pass rather than waiting for the annual.

If you write a cadence into your program, follow it. A documented quarterly review that visibly has not run in two years is worse in an inspection than no documented interval at all, because it converts a judgment call into a demonstrated failure to follow your own program.

The standard, tools & related reading

• The standard: Hazard Communication — 29 CFR 1910.1200 (reaching construction through 29 CFR 1926.59) · SDS Management hub
• Key terms: Safety Data Sheet · MSDS · Readily accessible · SDS Section 16 — revision date · Chemical inventory
• What it costs to get wrong: OSHA penalties in 2026
• Scope first: Does every chemical need an SDS?
• When a sheet is missing rather than stale: Triage the gaps in your library · Supplier won't provide an SDS?
• The audit method and the Rev 7 tells: Find the holes in your SDS library
• Retention: 30-year record retention under 1910.1020
• Access: Are digital SDSs legal? · Offline SDS access

Sheets don't expire — libraries go stale. The fix is not a bigger annual audit; it is making sure the updates your suppliers already send you actually land, knowing which changes force a new sheet, and keeping the right record of the one you replaced.

Note: General guidance, not legal advice. Construction employers are reached through 29 CFR 1926.59, which adopts 1910.1200 by reference, and OSHA-approved State Plans may have requirements at least as effective as the federal standard — verify your state's rules.

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Sources & verification: 29 CFR 1910.1200(g)(2) (16-section format), (g)(5) (three-month update duty and the parties it binds), (g)(6)(i) (updated sheet with the first shipment after an update), (g)(8) (maintain and readily accessible), and (j) (HCS 2024 compliance dates); 29 CFR 1910.1020(d)(1)(ii)(B) (30-year exposure-record retention and the substitute identity/where/when record). Interpretations quoted: OSHA letter of July 27, 2015 (maintaining the most current SDS received; requesting new sheets is permissive), OSHA letter of October 1, 1987 (retention of superseded MSDSs — same formulation may be discarded, different formulation requires both sheets 30 years), OSHA letter of April 18, 2008 (the sheet reflects current information as of the date prepared). HCS 2024 dates reflect the four-month extension published January 15, 2026 and were re-verified against osha.gov and the HazComFast source of truth (hcsDeadlines) on 2026-08-03. Last verified 2026-08-03. Not legal advice.