Safety Data Sheets Editing and Proofreading Services

Both versions of the hazard communication standard were in force at once, and for mixtures they still are. 29 CFR 1910.1200(j)(4) sets a transition period running from May 20, 2024 to the compliance dates that follow.¹ Within it, chemical manufacturers, importers, distributors, and employers "may comply with either this section or § 1910.1200 revised as of July 1, 2023, or both during the transition period."¹ For substances that window closed for manufacturers, importers, and distributors on May 19, 2026.¹ The only thing on a sheet that places it is the entry Appendix D requires in section 16, "The date of preparation of the SDS or the last change to it."²

Four dates, staggered two ways

The compliance dates divide by what is being evaluated and by who is doing the work. For substances, manufacturers, importers, and distributors were to comply "no later than May 19, 2026," and employers have until "November 20, 2026" to update alternative workplace labeling, the written program, and training.¹ For mixtures, the same two duties fall due on "November 19, 2027" and "May 19, 2028."¹ A workplace holding sheets for both substances and mixtures is therefore working to two schedules at once.

That schedule was itself changed while it was running. On January 15, 2026, OSHA published a notice extending the first deadline from January 19, 2026 to May 19, 2026.³ The other compliance dates moved by four months as well, and the notice came four days before the deadline it moved.³

What the 2024 rule changed in the sheet

The final rule took effect on July 19, 2024.⁴ Among its changes to Appendix D, it added particle characteristics to section 9, physical and chemical properties.⁴ It also revised how concentrations withheld as trade secrets are given.⁴

Thirteen prescribed ranges, and what may be used instead

A manufacturer that withholds an exact percentage does not invent its own range. 29 CFR 1910.1200(i)(1)(iv) prescribes thirteen of them, and they are set out in the appendix below.¹ Under (i)(1)(v), "The prescribed concentration range used must be the narrowest range possible."¹ The same paragraph allows one substitute. Where an exact range between 0.1 and 30 percent fits none of the prescribed ranges, two consecutive ones between (A) and (G) may be combined into a single range.¹ Under (i)(1)(vi), a manufacturer "may provide a range narrower than those prescribed."¹

A sheet reading 1 to 10 percent is neither one of the thirteen nor a combination of two consecutive ones. Which prescribed range a sheet carries is the manufacturer's decision, made against the narrowest-range rule. What is checkable is whether the printed range is on the list at all.

The term being protected is defined by reprinting an older text. Appendix E is headed Definition of "Trade Secret" (Mandatory).⁵ It gives the term as "any formula, pattern, device or compilation of information which is used in one's business".⁵ The definition continues, "and which gives him an opportunity to obtain an advantage over competitors who do not know or use it."⁵

Wording that may be varied, and wording that may not

Appendix C permits a narrow kind of editing and then bounds it. Precautionary statements "may be combined or consolidated to save label space and improve readability."⁶ They "may incorporate minor textual variations" where those variations assist in communicating safety information "and the safety advice is not diluted or compromised."⁶ Supplementary information is limited to material that "provides further detail and does not contradict or cast doubt on the validity of the standardized hazard information."⁶ Its placement "shall not impede identification of information required by this section."⁶

The label itself carries six elements: a product identifier, signal word, hazard statements, precautionary statements, pictograms, and the name, address, and telephone number of the manufacturer, importer, or other responsible party.⁷ Appendix C governs how those elements are allocated on the label.⁶ A label producer "may provide additional instructions or information that it deems helpful."⁷

Where the classification stops and the wording starts

Nobody at EditFast classifies a hazard, assigns a signal word, chooses a concentration range, or decides what belongs in section 2. Toxicologists and regulatory staff settle those. We also give no view on which compliance date a product falls under.

We read for wording and placement. A chemical named one way in section one and another way in section three gives one substance two names, whatever the right name turns out to be. A precautionary statement that has been reworded no longer matches the standardized text it came from. A section 16 date older than the revision it is supposed to record is a discrepancy on the face of the document. Everything entrusted to us remains confidential.

A sheet does not say which version of the standard it was written to. It carries the date required by section 16, and that date is what a reader has to work from. For mixtures the preparer works to November 19, 2027, and the employer duties fall due six months after that.