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Physical & Chemical properties

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The substance is a light brown, light yellow, organic powder at 20 °C and 1013 hPa; it is a member of the Stilbene Fluorescent Whitening Agents (SFWA) category, group 1, diethylamino derivative, tetrasulphonated sodium salt.

The substance has no melting point in the temperature range of 25 – 400 °C at atmospheric pressure (1013 hPa) and does not decomposes

Particle size distribution showed that the substance is characterized by a MMAD of 368 µm.

The partition-coefficient (n-octanol/water) was determined by an appropriate in silico estimation method because Stilbene Fluorescent Whitening Agents are ionisable substances and therefore difficult to test. The partition coefficient value (experimentally measured) is expected to be outside the applicability range of the shake flask method, the HPLC method, and the slow-stirring method. Nevertheless, the estimated value can be considered an evidence of the much greater affinity of the substance towards the water phase, compared to the affinity towards the octanol phase.

It is very soluble in water (201.1 g/l at 20 °C and pH 9), and fat solubility is lower than 0.1 mg/100 g fat.

Under environmental conditions the substance dissociates completely in water.

Since it is a solid, properties like vapour pressure, surface tension, flash point can be disregarded, while viscosity determination is technically not feasible.

It does not ignite and propagate combustion; it does not meet the criteria to be considered as flammable/explosive/oxidising.