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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Water solubility

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water solubility
Data waiving:
study scientifically not necessary / other information available
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Description of key information

The test substance,molybdenum trioxide, reaction products with bis[O,O-bis(2-ethylhexyl)] hydrogen dithiophosphate (Oil Free),is essentially insoluble in water. QSAR calculations estimate that water solubility is below 10-6mg/L; the U.S. EPA EPISuite models WSKOW and WATERNT predict water solubility values of 2.381 × 10-17mg/L and 9.9508 × 10-7mg/L, respectively. The UVCB substance includes a fraction that does not contain molybdenum that has a measured solubility of 0.05 μg/mL at 20 °C. 


Additional testing is waived based on the low solubility predicted by the QSAR models, the low solubility observed for the fraction not containing molybdenum, and the inherent difficulty in testing poorly soluble inorganic complexes.

Key value for chemical safety assessment

Additional information