Aspects to be considered for waste classification

While choosing the appropriate entry for a waste containing CaO/Ca(OH)2, please note that absolute non-hazardous entries will be non-hazardous. This means no further assessment on hazardous properties is necessary in order to determine whether the hazardous or non-hazardous entry should be assigned. For instance, slags from iron and steel industry can be assigned to the following entries: 10 02 01 wastes from the processing of slag ANH 10 02 02 unprocessed slag ANH Even if the CaO content of aforementioned slags from iron and steel industry would be above the concentration limit as laid down in Annex III to the WFD, the waste should be classified as non-hazardous, unless a Member State applies Article 7 of the WFD (see Chapter 2, Box 2). In many self-classifications or respectively safety data sheets in the frame of the CLP Regulation, calcium oxide (CaO) and calcium hydroxide (Ca(OH)2) are assigned hazard statement codes H315, H318 and H335. However, there exist other self-classifications using other hazard statement codes (refer to Annex 2 on which data sources to consult in order to check different self-classifications of CaO and Ca(OH)2). Please note that information gathered exclusively from self-classifications may not be sufficient for waste classification. For a decision between a MH or a MNH entry, the relevant hazardous properties are HP 4 ‘Irritant — skin irritation and eye damage’ and HP 5 ‘Specific Target Organ Toxicity (STOT)/Aspiration Toxicity’. Corresponding concentration limits are laid down in Annex III to the WFD (cf. Annex 3.4 and 3.5) and are also displayed in Table 6. Please note that Table 6 is based on hazard statement codes assigned to calcium oxide and calcium hydroxide have been taken from self-classifications. In case the applicability of these hazard statement codes can be validated by using additional information (e.g. information from the waste generating process), the consequence is: — if the sum of the concentrations of all substances classified as H318 (e.g. CaO and Ca(OH)2) exceeds or equals 10 %; the waste should be classified hazardous according to HP 4. Additionally: — if the sum of concentrations of all substances classified as H335 (e.g. CaO and Ca(OH)2) exceeds or equals 20 %; the waste should be classified hazardous according to HP 5. In accordance with the first indent of the Annex to the LoW, if a testing of the waste applying (non-vertebrate animal) methods provided in the Test Methods Regulation reveals that the waste in question does not display these hazardous properties, the results of the test should prevail. Please refer to Annex 3.4 and 3.5 for further information. Hazard Class and Category Code(s) Hazard Statement Code(s) from self-classification Concentration limit (total of substances) CaO Eye Dam. 1 STOT SE 3 H318 H335 ≥ 10 % ≥ 20 % Ca(OH)2 Eye Dam. 1 STOT SE 3 H318 H335 ≥ 10 % ≥ 20 %

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Source: EUR-Lex (Cellar) · retrieved 2026-09-07