Section 4: First aid measures

This section tells first responders what to do immediately after an exposure, by exposure route.

Section number: 4
Heading: First aid measures
Content status: Mandatory content
Required information: (a) measures by route (inhalation, skin, eye, ingestion)
(b) most important symptoms/effects, acute and delayed
(c) indication of immediate medical attention / special treatment if necessary.

Reference only. Not legal or regulatory advice. Verify against the primary source before you act.

Adjacent sections

See the whole sheet

SDS Section Guide lays out all sixteen sections in order with what each one must carry.

Sources

29 CFR 1910.1200 Appendix D (Table D.1), post-2024-HazCom-update text — as of 2026-07-13

Sections 1 to 11 and 16 carry mandatory content. Sections 12 to 15 must appear as headings, but OSHA does not enforce their content.

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Data vintage

Data: Safety data sheet 16-section structure, U.S. Occupational Safety and Health Administration current revision (77 FR 17884, Mar 26 2012; 89 FR 44459, May 20 2024; 91 FR 594-598, Jan 8 2026), retrieved 2026-07-13, 16 sections.