Registration Dossier
Registration Dossier
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EC number: 231-820-9 | CAS number: 7757-82-6
Endpoint summary
Administrative data
Description of key information
Additional information
Sodium sulfate is a white crystalline inorganic solid (The Merck Index, 2001). It has a melting point of 880-886 ˚C (Lide DR (ed.) in CRS Handbook of Chemistry and Physics, 2001; Macintyre J. (ed.) in Chapman & Hall Chemical Dictionary, 1992; Ullman's Encyclopedia, 1979) and the relative density of 2.7 at 20 ˚C (The Merck Index, 2001; Lide DR (ed.) in CRS Handbook of chemistry and physics, 2001; Ullman's Encyclopedia, 1979). The water solubility of sodium sulfate is determined to be 445.5 g/L at 20˚C and pH 5.23 (Harlan Laboratories Ltd., 2010a). The substance is not surface active (surface activity of a 1.0005 g/L aqueous solution at 20˚C is 71.0 mN/m) (Harlan Laboratories, 2010b). Sodium sulfate does not undergo auto-ignition till above 400°C at 99.4 kPa (Harlan Laboratories Ltd., 2010c). Based on its structural properties, i.e. the oxidation state of constituting atoms, and experience in manufacture and handling, flammability, explosive and oxidizing properties are not expected for sodium sulfate. Therefore classification of the substance as flammable, explosive or oxidizing is not warranted in accordance with EU Directive 67/548/EEC and EU Classification, Labelling and Packaging of Substances and Mixtures (CLP) Regulation (EC) No. 1272/2008.
The following data for particle size distribution were obtained (Harlan Laboratories, 2010d): 5% < 7.3 µm (SD = 2.322); 10% < 19.9 µm (SD = 1.944); 50% < 65.3 µm (SD = 2.515); 90% < 122.9 µm (SD = 7.972). The mass median diameter was determined to be 65.3 µm.
In accordance with Column 2 of REACH Annex VII/IX and/or with Section 1 of REACH Annex XI and/or the REACH Guidance on information requirements and chemical safety assessment (chapter R7.A), studies on boiling temperature, water-octanol partition coefficient (log Kow), vapour pressure, flash point, stability in organic solvents and identity of relevant degradation products, dissociation constant and viscosity do not need to be conducted.
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