H335 — May cause respiratory irritation

The GHS hazard statement for specific target organ toxicity, single exposure, category 3 (respiratory tract irritation). Here is what it means, the label elements that travel with it, and the substances that carry it.

AT A GLANCE · OFFICIAL STATEMENT
“May cause respiratory irritation.”
HAZARD CLASS
Specific target organ toxicity, single exposure
CATEGORY
Category 3 (respiratory tract irritation)
SIGNAL WORD
Warning

What it means

Effects on a specific organ or body system from a single exposure. Categories 1 and 2 cover significant organ damage (proven or presumed vs. suspected); Category 3 covers transient effects — airway irritation or drowsiness/dizziness — that pass after exposure ends.

Precautionary statements paired with H335

When the engine writes SDS Section 2 for a product carrying H335, these are the precautionary statements it assigns, with combined statements written as one line:

Substances that carry H335

308 of the 4,228 substances in our database carry H335 when classified in pure form — recognizable examples:

hydrogen peroxide solution
CAS 7722-84-1
Hydrochloric acid
CAS 7647-01-0
formaldehyde
CAS 50-00-0
glutaral
CAS 111-30-8
SAME HAZARD CLASS:H336H370H371

Reference information, not legal or professional advice. Statement texts and allocations follow 29 CFR 1910.1200 Appendix C (the GHS as adopted by OSHA HazCom 2024) 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, it assigns the hazard statements, signal word, pictograms, and precautionary statements from these same tables — automatically, with the calculation shown.