What does H336 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 H336?

H336 reaches the label and the safety data sheet of a mixture only when the classes and percentages of its components pass certain limits. The relevant limits in the Chemoris rule file 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 H336 written in the SDS?

In the SDS, H336 ("May cause drowsiness or dizziness.") first enters Section 2.1 as a classification, written as "STOT SE 3" together with the code. Section 2.2 then gives its full text as a label element. Components that have this class are listed row by row in the Section 3 table; in addition, 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 H336 appear on the label?

On the label H336 appears with the pictogram 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 H336 are given together.
• Section 2.2: label elements; H336 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 H336

The values below come from the Chemoris rule file (CLP Annex I). They show the condition under which H336 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.

H336 compared with H335 and H370

The table below puts H336 next to its closest neighbouring statements; the values are read from the rule data.

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

H335 H370

In which SDS sections does H336 appear?

H336 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 H336

H336 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 H336 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 H336 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 H336

• 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 H336 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 H336 (STOT SE). The difference between categories mostly comes from the degree of severity.

• H335May cause respiratory irritation.
• 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