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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Description of key information

- eye irritation/ eye damage: Category 1A H314
- skin corrosion/skin irritation: Category 1A H314

Key value for chemical safety assessment

Skin irritation / corrosion

Endpoint conclusion
Endpoint conclusion:
adverse effect observed (irritating)

Eye irritation

Endpoint conclusion
Endpoint conclusion:
adverse effect observed (irritating)

Respiratory irritation

Endpoint conclusion
Endpoint conclusion:
adverse effect observed (irritating)

Additional information

Results from calculated classification (using mixture toxicity rules) are supported (WoE) by additional consideration from phys chem properties of the UVCB substance.

Chemistry of the substance (see IUCLID section 4.23 chemical and mineralogical characterization) confirms the presence of irritating/corroding constituents such as strong acid or bases.

The UVCB is a complex metal containing substance , which major constituents are sulphuric acid and water. Sulphuric acid is a strong mineral acid that has high affinity to water. It dissociates in water to form sulphate and hydrogen (carbonium) ions. These are the relevant forms to determine hazard properties of the UVCB substance. Arsenic was the only constituent with concentration >0.1%. The irritation/corrosion potential of the UVCB is driven by the amount of sulphuric acid in the solution. The maximum across industry was taken to derive the classification of the UVCB

Effects on skin irritation/corrosion: irritating

Effects on eye irritation: irritating

Effects on respiratory irritation: irritating

Justification for classification or non-classification

The classification derived is applicable to all Sulphuric acid, waste gas cooling and cleaning, copper smelting. 

 The tested sample is representative for a worst case (maximum across industry), 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 material is accurately described from its elemental composition (typical concentrations and concentration ranges across production sites –IUCLID Section 1.2), and the specific speciation data (species in the liquid solution) obtained from a representative sample (IUCLID Section 4, in particular 4.23). 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, 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  "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”)