Registration Dossier
Registration Dossier
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EC number: 296-664-6 | CAS number: 92908-35-5
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.6 mg/L
- Assessment factor:
- 50
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 2 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.06 mg/L
- Assessment factor:
- 500
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 100 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 2.76 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.276 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.199 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Additional information
Justification for the use of different CAS numbers for the same chemical in the REACH dossier:
The substance Urea, reaction products with formaldehyde and glyoxal, CAS No. 92908-35-5, was formerly described by 2-Imidazolidinone, 4,5-dihydroxy-1,3-bis(hydroxymethyl)-, CAS No. 1854-26-8, which is a well-defined structure known under the common name ‘DMDHEU’ (Dimethyloldihydroxyethyleneurea). During collection of analytical data it was found to be a complex mixture of different molecules. Consequently it was decided to register the substance under CAS 92908-35-5 which better describes this chemical. However, many of the studies used in the chemical safety assessment in this dossier refer to CAS 1854-26-8. The identity of the test substance in these studies is the same as for the substance defined in chapter 1 of this dossier.
Conclusion on classification
Taking the available information into account (no toxicity up to nominal concentrations of at least 100 mg/l, not readily biodegradable, log Kow <0.3), no environmental classification is warranted according to (67/548) and (1272/2008).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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