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Physical & Chemical properties

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OB 5 -A is an organic light green fluorescent powder at 20 °C and 1013 hPa; it is a member of the Stilbene Fluorescent Whitening Agents category.

It has no melting point under atmospheric pressure (1013 hPa) up to 400 °C; it decomposes at a temperature of approximately 370 °C.

Particle size distribution showed that the substance is characterized by a MMAD of 233 µm.

The partition coefficient value (experimentally measured on some category members) resulted outside the validity domain of the shake flask method (log Kow < 2.3, at 25 °C and pH 7); nevertheless this result can be considered an evidence of the greater affinity of the substance with the water phase, respect to the octanol one and the calculated partition coefficient confirms this conclusion (log Kow: - 4.11).

The substance is very soluble in water (57.4 g/l at 20 °C and pH 8.97 - 9.02).

Under environmental conditions it dissociates completely in water.

Since the substance 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.