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EC number: 304-802-4 | CAS number: 94279-56-8
This substance is the product of a reaction between Zircon (EC no 239-019-6) and sodium hydroxide. The substance in water has a pH of > 13 due to the presence of significant amounts of residual sodium hydroxide. The UVCB substance as produced would be highly corrosive to skin due to the residual alkali; testing would not be required to demonstrate this is the properties of sodium hydroxide are well-known. In vivo testing of the substance would be inappropriate on animal welfare grounds, and such testing for substances where the pH is >11 is prohibited. The substance is classified based on this as skin corrosion/irritation, category 1A (H314), i.e. corrosive. Disodium metasilicate (229-912-9) has been tested for skin sensitisation as have a number of zirconium salts. None of these would contribute at all to the corrosiveness due to the sodium hydroxide present in this substance. In view of the corrosive nature of this substance, its potential for sensitisation is irrelevant.
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