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Description of key information

According to section 1 REACH Annex XI a study does not need to be conducted, as the substance is marketed as an aqueous solution only and  the density is expected to be very similar to the one of water. The data from manufactures proved this expectation and the density of SMBT aqueous solutions is only slightly higher than 1 kg/l at ambient temperature. 

Key value for chemical safety assessment

Additional information

A density of approx. 1.3 kg/l (25°C) was reported by Flexsys for a 45 - 50 % solution; and 1.26 kg/l (20°C) was reported by Lanxess for 50% solution and 1.14 kg/l for 30% solution.