Registration Dossier
Registration Dossier
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EC number: 273-744-9 | CAS number: 69012-45-9 By-product produced in the rolling of copper wire either in a conventional rod mill or a continuous cast rod mill. Consists of metallic copper, cuprous oxide and cupric oxide.
Endpoint summary
Administrative data
Description of key information
- complex metal containing substance
- solubility of metal constituents is poor
- classification via mixture toxicity rules
Key value for chemical safety assessment
Additional information
The UVCB substance is a complex metal containing substance. Each individual (metal) constituent of this UVCB substance can release soluble ions that can contribute (as ‘relevant’ component) to the mixture toxicity. With knowledge of the elemental composition (IUCLID section 1.4 & 1.2) and mineralogical information on the Grade representative sample (IUCLID Section 4.23), the mixture toxicity rules (EU CLP Guidance Annex I: 3.9.3.4, and cut-off) was used to calculate the Classification of the UVCB substance. Note: special threshold values apply in case of Pb (metal power)
Chemistry and mineralogy of the material (see IUCLID section 4.23 chemical and mineralogical characterization) were taken into account. In case of Grade 1 Scale/slag-type materials, the substance is a solid, and massive (only WC crushed sample show ca 40% below 20µm sized particulates, no other route than oral to consider). For Grade 2 dross-type material, the substance is solid with fine to grain or massive portions (WC powder forms of species relevant for classification were taken into account when applying Mixture Toxicity rules). See furthermore pictures in IUCLID section 1.4 "sampling protocol" and granulometry tests in IUCLID section 4.5. Water solubility (IUCLID section 4.8) and Sequential dissolutions (IUCLID 4.23 Chemical assays) furthermore confirming species present and their solubility behaviour.
Justification for classification or non-classification
Specific Target Organ Toxicity (repeated): not classified
The classification derived is applicable to Grade 1 Copper scales
Specific Target Organ Toxicity (repeated): STOT Re cat 2 H373 (triggered by Pb species)
The classification derived is applicable to Copper scales Grade 2, 3 and 4 (dross-type materials with Pb> or equal 0.5%)
See end-records and discussion above for detailed justifications.
The tested sample was representative for typical (and max Ni and Pb) across industry (for each Grade), defined within the concentration ranges outlined under IUCLID section 1.2
Self-classification of the UVCB substance (IUCLID Section 2.1 & 2.2) was performed based on below outline:
1. Characterization
The materials are accurately described from their elemental composition (typical concentrations and concentration ranges across production sites –IUCLID Section 1.2), and the specific speciation data (mineralogical information) obtained from the representative samples (IUCLID Section 4, in particular 4.23 RWC distribution pattern). This information is enough to initiate the classification process.
2. Classification by the Mixture Approach
The UVCB is treated as a complex metal containing substance with a number of discrete constituting compounds (metals, metal compounds, and non-metal inorganic compounds). The hazard classifications of each compound are then factored into a combined classification of the UVCB as a whole. For health endpoints, UVCB classifications are based on the combined hazards of the compounds whereby additivity or key cut off levels, specified in look-up tables are used, depending on the endpoint and amount of information available for the constituting compounds. For environmental endpoints, additivity and/or summation algorithms are applied to quantitatively estimate the mixture’s toxicity to aquatic organisms. These concepts and rules are incorporated in easy to use IT tools, which can be used to classify the UVCB.
3. Bridging or Read-Across
(Eco) -toxicological data are not available for the specific UVCBs being evaluated. Considering the knowledge and variability in composition, read-across and bridging is done by using a "representative" mineralogical/speciation analysis" combined with the "Typical/worst case" metal concentration (across companies) as a basis for the classification of the UVCB substance (chemical and mineralogical surrogates with similar origin/production process and physical/chemical properties –see IUCLID 1.4 for information on Sampling procedure).
4. Eventual correction
No correction for (bio)availability was made
See furthermore attached documents: Arche CLP tool version June 2010; Incorporated to tool (or attached): how elemental composition is translated into Mineralogical composition relevant for classification (i.e. “ input sheets” and 4.23 for RWC distribution patterns)
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