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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Additional physico-chemical information

Administrative data

Endpoint:
other: buffer capacity
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2013
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report date:
2013

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
other: Young et al.
Qualifier:
according to guideline
Guideline:
other: German TRGS 200, Annex I
Principles of method if other than guideline:
Determination of the alkaline or acidic reserve (buffer capacity) of a substance
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Hexahydro-2H-azepin-2-one, sodium salt
EC Number:
218-336-3
EC Name:
Hexahydro-2H-azepin-2-one, sodium salt
Cas Number:
2123-24-2
Molecular formula:
C6H11NO.Na
IUPAC Name:
sodium 2-oxoazepan-1-ide

Results and discussion

Results:
For sodium caprolactamat, the alkaline reserve was determined to be 5.13g (NaOH).

With this value, an estimation of the corrosive potential of the substance can be performed:
A substance has to be considered as corrosive, if the sum of the pH value and 1/12 of the alkaline reserve is higher than 14.5.

For sodium caprolactamat, this calculation results in 13.1 + 1/12*5.13 = 13.5

As this value is lower than 14.5, the substance would not have to be conisdered as "corrosive".

Applicant's summary and conclusion

Conclusions:
Although the determination of the alkaline reserve according to Young. would not result in a classification as "corrosive", the classification is applied as the pH value of the substance itself is 13.1 which is already higher than 11.5.