Registration Dossier
Registration Dossier
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EC number: 234-409-2 | CAS number: 12001-85-3
Endpoint summary
Administrative data
Description of key information
Zinc naphthenate is a brown solid at ambient temperature. The density of the test item at 20ºC was 1.13 g/cm3.
The melting point of could not be determined but a glass transition was determined at -51.4°C (221.7K). A boiling point could also not be determined, as the substance decomposed from 350°C. Naphthenic acids, zinc salts was determined to be not highly flammable.
The surface tension of a test solution at 90% of the test item saturation solubility in water and at 20°C was 61.6 mN/m, so the substance is not surface active. The water solubility of naphthenic acids, zinc salts was 31.4-56.3 mg/L at a loading rate of 100 mg/L and 134-198 mg/L at a loading rate of 1000 mg/L. Because of the observed spread, no mean value and therefore no maximum difference could be calculated, so it is not expected that more accurate results can be obtained. The partition coefficient of naphthenic acids, zinc salts was determined in a HPLC study to range from 0.8-5.4.
Naphthenic acids, zinc salts is a UVCB consisting of a large number of different constituents. The vapour pressure of one part of the test item, naphthenic acids, zinc salts was determined at 20°C and 25°C and found to be 1.3 Pa and 1.9 Pa, respectively. Vapour pressure of another part of the test item, naphthenic acids, zinc salts, was determined at 20°C and 25°C and found to be 0.026 Pa and 0.035 Pa respectively.
Additional information
The physico-chemical properties of zinc naphthenate were determined in GLP-compliant, guideline studies (CRL 2018). Experimental studies were undertaken for melting point, boiling point, density, vapour pressure, partition coefficient, water solubility, surface tension and flammability. The melting point, boiling point and water solubility of the test item could not be determined due to decomposition of the test item or because of its behaviour in water. The particle size distribution, flash point, self-ignition temperature, explosive properties and oxidising properties endpoints have been waived.
As zinc naphthenate is a UVCB consisting of a large number of different constituents, QSAR models have been used as supporting data to predict the physico-chemical properties for representative structures within the UVCB.
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