What does H335 mean?

Categories and label elements

CLP abbreviation	Pictogram	Signal word
STOT SE 3	GHS07Exclamation mark	Warning

Related precautionary statements (P codes)

The precautionary statements that CLP Annex IV assigns to this class. Not all of them go on the label: under CLP Article 28(3), no more than six precautionary statements appear on the label unless the nature and severity of the hazard require more; the selection depends on the product and its users.

When does a mixture need H335?

For a pure substance H335 comes straight from the classification; for a mixture it is derived from component data. The calculation rules applied to this code are:

• A component of this class is taken into account in a mixture only at a concentration of ≥ 1 %. (CLP Annex I 3.8.3.4.5; Table 1.1 (general))
• Summation method: the weighted sum of the qualifying components must reach ≥ 20 % for the mixture to be classified STOT SE 3 (H335). (CLP Annex I 3.8.3.4.5 (general limit 20 %))
• Summation method: the weighted sum of the qualifying components must reach ≥ 20 % for the mixture to be classified STOT SE 3 (H336). (CLP Annex I 3.8.3.4.5 (general limit 20 %))
• If a component has a harmonised specific concentration limit (SCL) and meets it, the mixture takes the corresponding class directly.

For a step-by-step worked example see classifying a mixture under CLP.

Where is H335 written in the SDS?

In the prepared SDS the class "STOT SE 3" is matched with the code in Section 2.1, the text of H335 is written in Section 2.2 next to the pictogram and signal word, and the class of the component shows up in Section 3. Section 16 collects the full text of the H statements cited by code. For H335, it appears in Section 11 (toxicological information), under heading 11.1, as a "Classified" line when the class is among the classes of the mixture.

How does H335 appear on the label?

When you see H335 on a label it is accompanied by GHS07 (exclamation mark), and it is written with the signal word "Warning". In the Chemoris template Section 2.2 carries at most 8 H statements; if the limit is exceeded the least severe ones are dropped and a warning is shown. For the bottom of the label, 7 P statements are candidates for this class in CLP Annex IV; under CLP Article 28 at most 6 of them are selected.

Where does it appear in the safety data sheet?

• Section 2.1: classification; the class abbreviation and H335 are given together.
• Section 2.2: label elements; H335 with its full text, pictogram and signal word.
• Section 3: composition table; in the row of every component that has this class.
• Section 16: the full text of the H statements cited as codes in earlier sections.

Class criteria and thresholds for H335

The values below come from the Chemoris rule file (CLP Annex I). They show the condition under which H335 arises in a mixture. For physical hazards and other classes that depend on test data, the result comes from the mixture's own measurement, not from component percentages.

H335 compared with H336 and H370

The table below puts H335 next to its closest neighbouring statements; the values are read from the rule data.

H335 and H336 carry the same signal word (Warning). Both are shown with the same pictogram (GHS07). The signal word differs: Warning for H335, Danger for H370. The pictogram differs: GHS07 for H335, GHS08 for H370.

H336 H370

In which SDS sections does H335 appear?

H335 does not stay only in the label section of an SDS; the class itself and the precautionary statements assigned to it shape the content of other sections too. The counts are calculated from the P statements that Annex IV assigns to this class.

Statements that appear on the label together with H335

H335 is never printed alone on a label; it sits next to the pictogram and the signal word. The Chemoris selection method (response, prevention, storage, disposal in that order; core statements first) gives these first 5 candidates for this class:

The GHS07 pictogram and “Warning” are printed together. This ranking applies because a label usually carries at most 6 statements; when a combined statement is selected, its parts are not printed again.

Official EU wording of H335 in other languages

When a product is exported to the EU, the SDS and label are expected in the official language of the Member State where it is placed on the market (REACH Article 31(5)). The table gives the official wording of H335 from the CLP Annex III/IV language versions published in the Official Journal of the European Union. Source: EUR-Lex CELEX 02008R1272-20260701.

Common mistakes with H335

• Printing too many pictograms: If the skull and crossbones (GHS06) applies, the exclamation mark (GHS07) is not used at all (CLP Article 26(1)(b)).
• Mixing up signal words: if any class requires “Danger”, only “Danger” is printed and “Warning” drops out (CLP Article 20(3)).
• Pouring every P candidate onto the label: there are 7 candidates, but CLP Article 28(3) limits a label to 6 precautionary statements (up to 8 when needed).

Next steps

To read a statement like H335 correctly on a label and in an SDS, see the guide How to read H and P codes; to pick the class and prepare the label automatically, use the free label tool.

Related hazard statements

Other H statements in the same hazard family as H335 (STOT SE). The difference between categories mostly comes from the degree of severity.

• H336May cause drowsiness or dizziness.
• H370Causes damage to organs <or state all organs affected, if known> <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard> .
• H371May cause damage to organs <or state all organs affected, if known> <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard> .

Frequently asked questions