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EC number: 231-744-6 | CAS number: 7718-98-1
VCl3 is very hygroscopic and gives, in contact of humidity :
VCl3 + H2O => VOCl + 2 HCL
VOCl + 1/2Cl2 => VOCl2
The dissolution reaction in water is instantaneous (half-life of VCl3 < 1 hour – VCl3 can be considered as a hydrolytically unstable substance), gives white fumes of HCl and the pH of the solution is < 2.
Due this physico-chemical property (HCl generation) and the weight of evidence (industrial practice), VCl3 is considered as corrosive.
With the physico-chemical property (HCl generation) and the weight of evidence (industrial practise), VCl3 is considered as corrosive on the criteria basis of the CLP regulation.
It is not possible to assign a sub-category (1A, 1B, 1C) on basis on physico-chemical effects (guidance on the application of the CLP criteria, version 5.0, July 2017).
Thereover, these corrosive sub-categories apply to some authorities and in transport, assigning or changing the packing group is particularly significant as it determines the requirements for the containment system and downstream consequences relating to the transport operation. The relationship between ADR (Agreement on Dangerous goods by Road) classification and GHS corrosive classification has been evaluated by the Committee of Experts on the Transport of Dangerous Goods and on the Globally Harmonized System of classification and Labelling of Chemicals, on 2012 and 2013 (ref. UN/SCETDG/41/ INF.53, UN/SCEGHS/23/INF.18, ST/SG/AC.10/C.3/2013/68 and ST/SG/AC.10/C.4/2013/8)
The committee concluded on the alignment for packing group III (and hazard class 8, the ADR classification for VCl3) with Skin corrosion Cat 1C.
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