The 16 sections of a Safety Data Sheet — explained

A GHS Safety Data Sheet has exactly 16 sections, in a standardized order. OSHA HazCom 2012 Appendix D defines the required content for each section. The format is designed so that anyone handling a chemical product can quickly find the information they need in an emergency.

The 16 sections divide into roughly four groups: identification and hazards (1–3), emergency response (4–6), handling and workplace information (7–8), product properties (9–12), and regulatory and revision information (13–16).

Small manufacturers often struggle most with Section 2 (hazard classification), Section 8 (OELs), Section 9 (physical properties requiring measurement), Section 11 (toxicological data), and Section 14 (transport classification). These sections require either laboratory testing, professional judgment, or data from ingredient supplier SDSs.

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Section-by-section summary

  1. Section 1 (Identification): Product name, manufacturer, address, emergency phone, recommended and restricted uses.
  2. Section 2 (Hazard identification): GHS classification, signal word, hazard statements, precautionary statements, pictograms. This is the most critical section.
  3. Section 3 (Composition): All hazardous ingredients with CAS numbers, concentrations, and H-codes. Trade secret claims must still disclose chemical identity to medical professionals.
  4. Section 4 (First aid): What to do for eye contact, skin contact, ingestion, and inhalation. Note any delayed effects.
  5. Section 5 (Fire-fighting): Suitable extinguishing media, special fire hazards, required PPE for firefighters.
  6. Section 6 (Accidental release): Personal precautions, environmental precautions, containment and cleanup methods.
  7. Section 7 (Handling/storage): Precautions for safe handling, storage conditions, incompatible materials.
  8. Section 8 (Exposure controls/PPE): OELs for each ingredient (OSHA PELs, ACGIH TLVs), engineering controls, required PPE.
  9. Section 9 (Physical/chemical properties): Appearance, odor, pH, flash point, boiling point, density, solubility, vapor pressure, etc.
  10. Section 10 (Stability/reactivity): Stability, conditions to avoid, incompatible materials, hazardous decomposition products.
  11. Section 11 (Toxicology): Routes of exposure, acute toxicity (LD50), skin/eye effects, sensitization, chronic effects, carcinogenicity.
  12. Section 12 (Ecology): Aquatic toxicity, persistence, bioaccumulation. Note: OSHA does not enforce Sections 12-15, but they are required by GHS.
  13. Section 13 (Disposal): Waste disposal methods, applicable waste codes.
  14. Section 14 (Transport): UN number, proper shipping name, hazard class, packing group. Requires training in DOT, IATA, IMDG rules.
  15. Section 15 (Regulatory): TSCA status, SARA 313 chemicals, Prop 65, REACH, any other applicable regulations.
  16. Section 16 (Other): Revision date, revision history, key to abbreviations, sources used.

Questions

Do all 16 sections need to be filled in?

Yes, all 16 sections must appear. If information is not applicable (e.g. a non-flammable liquid has 'N/A' for flash point), state that explicitly. Leaving sections blank is not acceptable under HazCom.

OSHA says it doesn't enforce Sections 12–15. Does that mean I can skip them?

No. HazCom requires all 16 sections. OSHA enforcement focuses on Sections 1–11, but the full 16-section format is required. International shipments and customers may also require complete sections.

Who can verify the hazard classification in Section 2?

A qualified industrial hygienist, toxicologist, or safety professional with training in GHS classification. Many SDS authoring services provide this as a standalone review service, which is less expensive than a full SDS authoring service.

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