Registration Dossier
Registration Dossier
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EC number: 237-574-9 | CAS number: 13845-36-8
Endpoint summary
Administrative data
Description of key information
Additional information
Typically the purity of pentapotassium triphosphate is> 90% (dry weight, after excluding water). All impurities present at >1% are other inorganic phosphates (typically potassium phosphates) or other related inorganic substances. There are no hazardous impurities present within the substance at levels > 0.1%).
Pentapotassium triphosphate has a melting point of > 450°C and is considered to be moderately soluble in water (45.7% w/w at 20 ± 0.5°C, solution pH of 9.1). The key study for water solubility (O'Connor BJ, 2010) made the following observations:
Investigation into the influence of the pH range 4 to 9 on the solubility of the test material was performed but in each case the test material demonstrated moderately basic characteristics and a significant buffering effect on dissolution, overwhelming the capacity of the buffer solutions to give solution pH’s and solubility results approximately equal to those observed in un-buffered water. Therefore, as the buffering capacity of the solutions used were considered to exceed that of the environment, the solubility of the test material was considered to be independent of the initial pH range 4 to 9, resulting in a consistent basic pH solution capable of overwhelming any weak to moderate buffering capacities present.
The temperature range of 10°C to 30°C was also shown not to have a significant influence on the water solubility of the test material (range 41.7 to 46.0% w/w).
In addition, pentapotassium triphosphate is not considered to possess any of the following hazardous physico-chemical properties; autoflammability and/or self-ignition, flammability, explosiveness and oxidising properties.
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