Registration Dossier
Registration Dossier
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EC number: 423-340-5 | CAS number: 162881-26-7 CGI 819
Endpoint summary
Administrative data
Description of key information
Additional information
The fate of phenyl bis(2,4,6-trimethylbenzoyl)-phosphine oxide is tied to the fate of the products to which it is applied. The substance generates free radicals within the coating films or sections of the reinforced plastic by means of exposure to UV light. The free radicals are consumed (destroyed) in the curing process, with limited residual substance in fully cured films. Organo-phophorus residues are encased in the polymer matrix and do not migrate.
Should limited uncured product be disposed of to landfill, e.g. as residues in contaminated packaging, it should be adsorbed to soil, based on its very low water solubility and high adsorption coefficient. As this substance is a photoinitiator, it would be expected to rapidly degrade in the environment upon exposure to natural light.
Phenyl bis(2,4,6-trimethylbenzoyl)-phosphine oxide showed 0% degradation after 28 days and was determined to be not readily biodegradable. It was found to be non-inhibitory to the activity of the inoculum.
Bioaccumulation testing was not undertaken. Since the substance is not ready biodegradable, has a log Pow value of 5.77 and molecular weight of 418.47 g/mol, bioaccumulation could be a perceived risk]. However, the very low water solubility (< 0.1 mg/L), low environmental exposure and expected degradation upon exposure to natural light should limit bioaccumulation.
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