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Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
March 3, 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study, according to EU and OECD guidelines, with Internal management system and certificate of analysis included in the report.
Qualifier:
according to
Guideline:
EU Method A.3 (Relative Density)
Version / remarks:
May 31, 2008
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Version / remarks:
Adopted July 27, 1995
Deviations:
no
GLP compliance:
no
Remarks:
Internal management system
Type of method:
oscillating densitimeter
Type:
relative density
Density:
0.931
Temp.:
20 °C

Calibration and validity verification

The calibration was carried out at August 16, 2010.

The measured density of the calibration liquids at 20°C is mentioned in table 1. Also the deviation from the literature values is mentioned. The mean value for the calibration liquids agrees within ± 0.002 g/cm3(accuracy range) with the literature values.

 

Table 1: measured density of calibration liquids at 20°C

Calibration liquid

Measurement

Density

[g/cm3]

Mean density value [g/cm3]

Deviation from literature value [g/cm3]

Demineralized water

1

0.9982

 

0.9982

 

0.0000

2

0.9982

3

0.9982

Ethanol

1

0.7897

 

0.7896

 

0.0003

2

0.7896

3

0.7896

4

0.7896

 

The validity of the method was verified prior to the measurement with the test substance using demineralized water.

Measured density of water at 20°C:

measurement 1: 0.9981 g/cm3

measurement 2: 0.9981 g/cm3

measurement 3: 0.9981 g/cm3

These values agree within ± 0.0005 g/cm3with the literature value for demineralized water.

 

Test substance

Measured density of the test substance at 20°C:

measurement 1: 0.9306 g/cm3

measurement 2: 0.9307 g/cm3

measurement 3: 0.9308 g/cm3

measurement 4: 0.9307 g/cm3

 

Mean value at 20°C is 0.9307 g/cm3. The standard deviation is ± 0.0001 g/cm3.

 

The relative density of the test substance is 0.9307.

Conclusions:
The relative density of O-(2-ethylhexyl) O,O-tert-pentyl peroxycarbonate at 20°C is 0.9307 (± 0.0001).
Executive summary:

The relative density of O-(2-ethylhexyl) O,O-tert-pentyl peroxycarbonate was determined according to EC Regulation No 440/2008, Guideline A.3 and according to OECD Guideline 109, and in accordance with European Chemicals Agency (ECHA), Guidance on information requirements and chemical safety assessment, Chapter R.7a, Endpoint specific guidance, May 2008.

The density was measured in triplicate. The apparatus was calibrated with three different calibration liquids.

The relative density of O-(2-ethylhexyl) O,O-tert-pentyl peroxycarbonate at 20°C is 0.9307 (± 0.0001).

Description of key information

The relative density of O-(2-ethylhexyl) O,O-tert-pentyl peroxycarbonate at 20°C is 0.9307 (± 0.0001).

Key value for chemical safety assessment

Relative density at 20C:
0.931

Additional information

The outcome is supported by the findings in the Pergan report:

The density of O-(2-ethylhexyl) O,O-tert-pentyl peroxycarbonate at 20°C is 0.927+/-0.002 g/ml.

Although the measurement of the density is done on another product from a different company than the measurement of Nagehout, the outcome is practically the same.

The outcome is further supported by the broad data in the ACD calculation:

The calculated density of O-(2-ethylhexyl) O,O-tert-pentyl peroxycarbonate at 20°C is 0.882- 1.002 g/cm³.