GHS REFERENCE / H-CODES / H332

H332 — Harmful if inhaled

The GHS hazard statement for acute toxicity, inhalation, category 4. Here is what it means, the label elements that travel with it, and the substances that carry it.

At a glance

Official statementHarmful if inhaled.
Hazard classAcute toxicity, inhalation
CategoryCategory 4
Signal wordWarning
PictogramGHS07 HarmfulGHS07 — Exclamation mark

What it means

Serious harm from breathing the substance — as gas, vapor, dust, or mist — over a single short exposure. Categories are set from acute toxicity estimates (ATE) per GHS Chapter 3.1.

Precautionary statements paired with H332

When the engine writes SDS Section 2 or a container label for a product carrying H332, these are the P-codes it assigns, in the official Annex 3 groups:

PreventionP261Avoid breathing dust/fume/gas/mist/vapors/spray.
P271Use only outdoors or in a well-ventilated area.
ResponseP304IF INHALED:
P312Call a POISON CENTER or doctor if you feel unwell.
P340Remove person to fresh air and keep comfortable for breathing.

Substances that carry H332

4 of the 4,225 substances in our database carry H332 when classified in pure form — recognizable examples:

  • 2-methylisothiazol-3(2H)-one — CAS 2682-20-4
  • Methylchloroisothiazolinone (CMIT) — CAS 26172-55-4
  • Reaction mass of CMIT and MIT (3:1) — CAS 55965-84-9
  • Sodium lauryl sulfate (SLS) — CAS 151-21-3

Same hazard class: H330 · H331 · H333

Reference information, not legal or professional advice. Statement texts and allocations follow GHS Rev 9 / 29 CFR 1910.1200 Appendix C as implemented by our classification engine; the regulatory text and agency practice control. Claims last reviewed July 23, 2026.

The engine writes these for you.

When SDS HQ authors an SDS or a container label, it assigns the hazard statements, signal word, pictograms, and precautionary statements from these same tables — automatically, with the calculation shown.

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