Registration Dossier

Diss Factsheets

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Note that much of the data was proved by ECHA under the 12 year data access rule. No robust summary was available at the time of preparation of this document and some key data was not included in the information from ECHA.

The substance is supplied in powder form with a melting point of 113 C and will decompose before boiling. The vapour pressure is not significant for purposes of environmental or workplace exposure, but dust content is monitored and precautions are needed to prevent generation of dust and reduction of exposure. Dust explosion risk is thought to be slight, but risk management measures should take this into account.

Particle size analysis performed on a 2009 batch of the substance from the non-EU source suggests a mean particle size that is a possible risk of inhalation and risk management measures will include precautions to prevent generation or dust and recommendations to wear dust masks and work in good areas of ventilation.

The substance will rapidly degrade in light (the function is UV curing agent) and from the water solubility data provided by ECHA, it is unclear if the water solubility of 5.9 mg/l was recorded from measurements in the dark, or if this low figure is only recording residues after photolytic breakdown. A hydrolysis study was performed (environmental fate and pathways), but only 10% loss was reported (assumed performed in the dark). Analysis from fish and Daphnia testing using semi-static conditions reported up to 95% loss of test substance under light conditions over 24 hours.

The partition coefficient Log Pow 2.9 would suggest a low risk of bioaccumulation. This was performed by HPLC and interaction of light should not have been significant. EPISuite modelling predicted a partition coefficient of Log Kow 4.5.

The substance demonstrated slight surface active properties, but the concentration tested was slightly greater than the reported solubility in water. It is also assumed that as this test would normally be performed in the light that some photolytic degradation could have affected the results.

There are no reported physical hazards relating to the substance; it does not meet the criteria for flammable, explosive or oxidising.