Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Endpoint:
hydrolysis
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2003
Report date:
2003

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
EU Method C.7 (Degradation: Abiotic Degradation: Hydrolysis as a Function of pH)
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: crystalline

Results and discussion

Dissipation DT50 of parent compoundopen allclose all
pH:
4
Temp.:
50 °C
DT50:
< 2 h
pH:
7
Temp.:
50 °C
DT50:
< 2 h
pH:
9
Temp.:
50 °C
DT50:
< 2 h

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Executive summary:

The substance is insoluble in water, but rapidly undergoes surface hydrolysis to well known products: aluminium hydroxide, a keto ester, and a C-5 diol. The keto ester can hydrolyse further to give a keto acid and an alcohol.

At pH 9, it was evident that any keto ester formed in the hydrolysis was in turn rapidly and nearly completly hydrolysed. At 2 h, ca. 30% of the keto ester was detected, and a further 35% was already hydrolysed, as determined by the amount of alcohol recovered.

At pH 7, 50% of the C5-diol was recovered in <2 h. The keto ester was more stabel than at pH 9, and 50% was recovered in <2 h.

At pH 4, 50% of the keto ester was recovered in <2 h. However, the recovery of the diol was slower, reaching 50% in ca. 7 h.

Given the hydrolysis characteristics of the substance, it was decided, in agreement with the UK Environment Agency, to test for aquatic toxicity of the hydrolysis products.