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Magnesium hydrogenorthophosphate (EC 231-823-5, CAS 7757-86-0) is inorganic solid white powder. The substance has a melting point > 450°C and therefore a study for boiling point does not need to be conducted. The relative density of magnesium hydrogenorthophosphate was determined to be 2.17 at 21 °C. The water solubility of the test material has been determined to be 0.578 g/l at 20 °C in un-buffered glass double-distilled water.

Overall, it can be concluded that magnesium hydrogenorthophosphate is not considered to possess any of the following hazardous physical-chemical properties: autoflammability and/or self-ignition, flammability, explosiveness and oxidising properties.

Thus, the substance does not meet the classification criteria for physical-chemical hazard in accordance with Regulation (EC) No 1272/2008 (CLP) and the Globally Harmonized System of Classification and Labelling of Chemicals (GHS).