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Physical & Chemical properties

Storage stability and reactivity towards container material

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Endpoint:
storage stability and reactivity towards container material
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
no data
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
This study was performed by a governmental agency (the German "Bundesanstalt für Materialforschung und -prüfung, BAM; Federal Institute for Material Research and Testing) with respect to classification according to transport regulations. However, documentation of the testing procedure is relatively brief. Therefore, in view of the general reliability of governmental institutes, the report was considered to be reliable with restrictions.
Qualifier:
no guideline available
Principles of method if other than guideline:
According to IMDG-Code S.8003, if the corrosion rate at 55 °C test temperature is lower than 6.25 mm/year, the test material is non-corrosive to metal surfaces.
GLP compliance:
no
Type of method:
testing for reactivity towards container material
Remarks:
Testing of the corrosivity of milk of lime (turbid aqueous solution of calcium dihydroxide) towards steel and aluminium (potential container materials).
Specific details on test material used for the study:
PACKAGING
- Type of container / packaging: Aluminium sheets were used as surrogate for a container
- Pack size: Not applicable
- Approximate empty weigth or volume: Not applicable

TEST CONDITIONS
- Study duration: 60 days
- Temperature: 55 °C
- Humidity: No data, sheets were immersed half or completely
- Sampling times: End of study

ANALYTICAL METHODS
- Analytical method used: None
- Handling of test samples prior to sampling: Not applicable

OTHER
- The corrosion rate was determined in mm/year according IMDG-Code S.8003.
- The oxide layer of the aluminium sheet was removed prior to exposure.
Results:
40 % milk of lime: Corrosion rate: < 6.25 mm/year (at 55 °C)
10 % milk of lime: Corrosion rate: < 6.25 mm/year (at 55 °C)
Transformation products:
not specified
Storage stability / reactivity towards container material:
corrosive to container material
Conclusions:
According to the criteria of IMDG-Code S.8003, milk of lime (40 % or 10 % aqueous solution of calcium dihydroxide) is not corrosive to aluminium (and steel).
Endpoint:
storage stability and reactivity towards container material
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
no data
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
This study was performed by a governmental agency (the German "Bundesanstalt für Materialforschung und -prüfung, BAM; Federal Institute for Material Research and Testing) with respect to classification according to transport regulations. However, documentation of the testing procedure is relatively brief. Therefore, in view of the general reliability of governmental institutes, the report was considered to be reliable with restrictions.
Qualifier:
no guideline available
Principles of method if other than guideline:
According to IMDG-Code S.8003, if the corrosion rate at 55 °C test temperature is lower than 6.25 mm/year, the test material is non-corrosive to metal surfaces.
GLP compliance:
no
Type of method:
testing for reactivity towards container material
Remarks:
Testing of the corrosivity of milk of lime (turbid aqueous solution of calcium dihydroxide) towards steel and aluminium (potential container materials).
Specific details on test material used for the study:
PACKAGING
- Type of container / packaging: Steel sheet was used as surrogate for a container
- Pack size: Not applicable
- Approximate empty weigth or volume: Not applicable

TEST CONDITIONS
- Study duration: 60 days
- Temperature: 55 °C
- Humidity: No data, sheets were immersed half or completely
- Sampling times: End of study

ANALYTICAL METHODS
- Analytical method used: None
- Handling of test samples prior to sampling: Not applicable

OTHER
- The corrosion rate was determined in mm/year according IMDG-Code S.8003.
- The oxide layer of the aluminium sheet was removed prior to exposure.
Results:
40 % milk of lime: Corrosion rate: < 6.25 mm/year (at 55 °C)
10 % milk of lime: Corrosion rate: < 6.25 mm/year (at 55 °C)
Transformation products:
not specified
Storage stability / reactivity towards container material:
corrosive to container material
Conclusions:
According to the criteria of IMDG-Code S.8003, milk of lime (40 % or 10 % aqueous solution of calcium dihydroxide) is not corrosive to steel (and aluminium).

Description of key information

The corrosion rate of aluminium and steel at 55 °C test temperature by aqueous solutions of calcium hydroxide is lower than 6.25 mm/year, thus the test material is non-corrosive to metal surfaces.

Additional information

Non-corrosive to metal surfaces.

Since alkalinity is the driving factor for reactivity of the substance towards container materials and alkalinity of lime (chemical) hydraulic and calcium hydroxide is comparable (the pH of a saturated aqueous solution of lime (chemical) hydraulic has been determined at 12.3 (see water solubility, O'Connor and Woolley, 2010), and Ca(OH)2 creates a pH value of 12.4 (Fox, 2010b), the results of this study can be considered relevant also for lime (chemical) hydraulic.