Registration Dossier
Registration Dossier
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EC number: 233-059-8 | CAS number: 10026-12-7
Endpoint summary
Administrative data
Description of key information
Additional information
Niobium pentachloride is a hygroscopic yellow substance consisting of monoclonal crystals at room temperature. It has a melting point of 205.8 °C and a boiling point of 247.4 °C, its density is 2.78 g/cm³ at near room temperature. The particle size distribution is as follows:
- >2000 µm: 5.95 % (w/w)
- > 1000 and ≤ 2000 µm: 44.9 % (w/w)
- > 500 and ≤ 1000 µm: 25.4 % (w/w)
- ≤ 500 µm: 23.75 % (w/w)
The measured equilibrium vapour pressure of niobium pentachloride is 22.8 hPa at 153.8 °C.
Niobium pentachloride decomposes after contact with water. The concentration of dissolved niobium – the decomposition product – at the solubility limit upon mixing NbCl5with water, determined in triplicate at nominal loading rates of 9.1- 14.0 g/L varied between 1.3-2.3 g Nb/L (3.74- 6.79 g NbCl5/L). The results considered most relevant for exposure assessment are those measured from NbCl5dissolution in water with subsequent pH adjustment as also potential release of the substance to the environment will take place via process waste water which is neutralized prior to entering any sewage treatment plant. The results from triplicate measurements in water after adjustment to pH 7 range between <1.1 mg Nb/L (LOQ; < 3.2 mg NbCl5/L) and 92.2 mg Nb/L (248.9 mg NbCl5/L).
The substance is considered non-flammable, no self-ignition of the substance can be observed up to temperatures of 400 °C. Furthermore, NbCl5does not exhibit oxidizing properties.
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