Registration Dossier
Registration Dossier
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EC number: 247-953-0 | CAS number: 26747-90-0
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
The substance undergoes no hydrolysis reaction in demineralized water within 24 hours and remains as an undissolved solid residue (Neuland, 2016).
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 1 yr
- at the temperature of:
- 20 °C
Additional information
"Should read: > 1 year (calc.)"
As the substance was found to be insoluble in water (<0.0032 mg/L at 20 °C and pH 5) it was not possible to prepare an aqueous solution to perform a hydrolysis test according to the requirements of OECD TG 111. In deviation to the guideline aqueous suspensions in two different concentrations and incubation at 20 °C for 24 hours under stirring were prepared. The content of total organic carbon (TOC) in the aqueous phases was measured after filtration. IR spectra of the undissolved sediments and comparison with the IR-spectrum of the original test item were recorded. The content of total organic carbon in the filtrate of the test solutions was determined to be < 2 mg/L TOC (limit of quantification of the analytical method). Therefore it can be assumed that no organic constituents were present in the aqueous phase of the hydrolysis test solution (below the limit of quantification). The IR spectra of the undissolved sediment and the original test item showed no difference. Therefore it can be assumed that the solid sediment is identical with the test item. The test item did not undergoe hydrolysis reaction in demineralized water within 24 hours and remained as an undissolved solid residue. No further investigations were carried out.
The test item was added to dimineraised water above water solubility limit. According to knowledge of isocyanate chemistry, isocyanates hydrolyses to amines in contact with water. Amines then react rapidly with isocyanates to form urea and afterwards polyurea substances. With TOC as unspecific analysis used in this study and the applied test amount above water solubility this typical hydrolysis behaviour technically cannot be observed.
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