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Acid Red 357 (AR357) is a red organic powder at 1013 hPa and 20 °C.

Between 25-130 °C release of imbibition water/solvent was observed, followed by decomposition of the product between 290 -430 °C (onset at 326.7 °C; enthalpy = 1931.4 J/g); therefore both melting and boiling points were not recorded .

The particle size distribution of the AR357 was analyzed using the Mastersizer 2000 tool and the MMD resulted 24.249 µm.

AR357 is very soluble in water (418.11 g/l a 20 °C and pH 6.84) and Pow value was calculated as 0.0328 (average log Pow: -1.4891), showing a greater affinity with the water phase, than the octanol phase. The relative density of the substance, analyzed by means of pycnometer method, is 1.564 at 20 °C.

Since it is a solid, properties like vapour pressure, surface tension and flash point can be neglected.

AR357 is not expected to be auto-flammable, flammable, explosive and it is deemed to be potentially not oxidising based on the chemical structure, the oxygen balance values and the known experience in the handling and use of substances.