3.2 Sections 1 to 8: the working half

1 Why the numbering is the point

Paragraph (g)(2) requires the sheet to include at least the following section numbers and headings, and associated information under each heading, in the order listed. The appendix that fills in what each section contains is Appendix D, and it is mandatory.

That fixed order is not bureaucracy, it is emergency design. Nobody reads a sixteen-section document during an incident. They go to a number. Teaching the numbers — especially 2, 4, 6, 7, 8 and 10 — is the single highest-value thing in HazCom training, and it is precisely what (h)(3)(iv) means by the safety data sheet, including the order of information and how employees can obtain and use the appropriate hazard information.

2 Sections 1 to 3: what it is

Section 1, Identification. The product identifier — the same string that appears on the label under Appendix C.1 and on your chemical list under (e)(1)(i) — plus other means of identification, recommended use and restrictions on use, the supplier's name, address and telephone number, and an emergency phone number. When a marketing name on the can differs from what is here, this is the version that goes on your list.

Section 2, Hazard(s) identification. The classification of the chemical, the label elements — signal word, hazard statements, pictograms, precautionary statements — and a description of any hazards not otherwise classified. Section 2 is where the HNOC that paragraph (f)(1) keeps off the container surfaces. It also states the percentage of ingredients of unknown acute toxicity where that is above one percent.

Section 3, Composition/information on ingredients. Chemical identity, common names and synonyms, CAS number and other identifiers, and the concentration or concentration ranges of ingredients. This is the section paragraph (i) allows to be redacted for a supportable trade secret claim — in which case the sheet must say so and, where a concentration range is claimed, must give the narrowest of the prescribed ranges from (i)(1)(iv)(A) through (M).

3 Sections 4 and 5: when it has already gone wrong

Section 4, First-aid measures. Necessary measures by route of exposure — inhalation, skin, eye, ingestion — the most important symptoms and effects both acute and delayed, and an indication of immediate medical attention and special treatment needed where required.

Two habits make section 4 useful rather than decorative. Read it before the product is used, so that anyone can act in the first minute without reading. And read the delayed effects: several common industrial chemicals produce symptoms hours after exposure, and a worker sent home feeling fine is a decision made on incomplete information.

Section 5, Fire-fighting measures. Suitable — and unsuitable — extinguishing media, specific hazards arising from the chemical such as hazardous combustion products, and special protective equipment and precautions for fire-fighters.

The unsuitable media line is the one that matters most and is read least. Putting water on the wrong product is how a small fire becomes a large one. If your site holds anything where water is contraindicated, that belongs in your emergency action plan and in the pre-incident information you give the responding fire department — not only in a binder.

4 Section 6: accidental release measures

Section 6 is written for the moment a container fails. Under Appendix D it covers personal precautions, protective equipment and emergency procedures; environmental precautions; and methods and materials for containment and cleaning up.

It is also the section that feeds the decision covered in Part 4 of this course: whether what you are looking at is an incidental release that the people in the immediate area can absorb, neutralize or otherwise control at the time of release — or an emergency response under 29 CFR 1910.120. Section 6 tells you what containment and cleanup would actually require. If your site does not have those materials and that protective equipment, the answer to the incidental-release question is already no.

5 Sections 7 and 8: how to work with it every day

Section 7, Handling and storage. Precautions for safe handling, and conditions for safe storage including any incompatibilities. This is where segregation decisions come from — read together with section 10, which names the materials to avoid.

Section 8, Exposure controls/personal protection. This is the most operationally dense section on the sheet. Under Appendix D it carries OSHA permissible exposure limits, ACGIH threshold limit values and any other exposure limits used or recommended by the preparer; appropriate engineering controls; and individual protection measures such as personal protective equipment.

Note the order in that list: limits, then engineering controls, then PPE. It mirrors the hierarchy the rest of OSHA's health standards use — 1926.55(b) requires administrative or engineering controls to be implemented first whenever feasible, with protective equipment used where they cannot achieve compliance. A sheet that recommends a respirator is not telling you to skip the ventilation.

6 The exposure limits line, and where it leads

Section 8 is often the first place a worker meets a permissible exposure limit. It is worth being clear about what those numbers are and are not.

An OSHA permissible exposure limit is enforceable, and it lives in 29 CFR 1910.1000 for general industry and 29 CFR 1926.55 for construction, or in a substance-specific standard where one exists — 1926.1153 for respirable crystalline silica, 1926.62 for lead, 1926.1101 for asbestos, 1926.1126 for hexavalent chromium. An ACGIH threshold limit value is a recommendation from a private organization, often lower, and is not enforceable by OSHA as such. A supplier may print both, and the sheet will say which is which.

What the sheet cannot tell you is your exposure. A limit is a concentration in air over a period; whether your crew reaches it depends on the task, the enclosure, the ventilation and the duration. That is the work of an exposure assessment, and where a substance-specific standard applies it will tell you exactly how to do one. Section 8 gives you the number to compare against, not the measurement.