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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:
October 2011 – July 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study, under Internal management system, according to OECD and EC guidelines, certificates of analysis included in the report.
Qualifier:
according to guideline
Guideline:
EU Method A.3 (Relative Density)
Version / remarks:
, May 31, 2008
Deviations:
no
Qualifier:
according to guideline
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:
0.975
Temp.:
20 °C

Calibration and validity verification

The calibration was carried out on August 16, 2010.

The measured density of the calibration liquids at 20°C is mentioned in table below. 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 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

 

0.0000

2

0.9982

3

0.9982

Ethanol

1

0.7897

 

0.7896± 0.0001

 

0.0003

2

0.7896

3

0.7896

4

0.7896

Dichloro-methane

1

1.3244

 

1.3248± 0.0004

 

0.0018

2

1.3251

3

1.3252

4

1.3246

The validity of the method was verified prior to the measurements with the test substances using demineralized water.

Measured density of water at 20°C (determined just before the measurement with Trigonox 187-C40):

  • measurement 1: 0.9981 g/cm3
  • measurement 2: 0.9981 g/cm3
  • measurement 3: 0.9980 g/cm3

Measured density of water at 20°C (determined just before the measurement with Trigonox 187-C70 and with isododecane):

  • measurement 1: 0.9981 g/cm3
  • measurement 2: 0.9981 g/cm3
  • measurement 3: 0.9980 g/cm3

Test substances

The measured density of the test substances at 20°C

Test substance

Measurement

Density

[g/cm3]

Mean density value [g/cm3]

Date of test

Trigonox 187-C40

(content: 37.7%)

1

0.8300

 

0.8301 ± 0.0001

 

10/31/2011

 

2

0.8302

3

0.8300

Trigonox 187-C70

(content: 71.3%)

1

0.9115

 

0.9111 ± 0.0004

 

07/24/2012

2

0.9112

3

0.9107

Isododecane

1

0.7478

 

0.7479 ± 0.0002

 

07/24/2012

 

2

0.7481

3

0.7478

4

0.7478

Relative density of Bisisobutyryl peroxide

The density of Bisisobutyryl peroxide is calculated from the measured values of the three test substances. This is done by fitting the measured data of table above and calculate the value for Bisisobutyryl peroxide in its pure form by linear extrapolation.

 

The linear fit result in the next density equation with a regression coefficient of 0.9992.

 

D = 0.7466 + 0.002286C

 

With:

D = density [g/cm3]

C = concentration of Bisisobutyryl peroxide [%]

 

The density of 100% Bisisobutyryl peroxide calculated from this equation is 0.9752 g/cm3. The linear fit gives a high regression coefficient. So, the calculated density is a reliable value.

 

The relative density of Bisisobutyryl peroxide at 20°C is 0.9752.

 

Conclusions:
The relative density of Bisisobutyryl peroxide at 20°C is 0.9752.
Executive summary:

The relative density of Bisisobutyryl peroxide was calculated from density studies of two diluted formulations of this substance and of the solvent used in these formulations. The study had to be carried out in this way, because Bisisobutyryl peroxide cannot be handled safely in its pure form.

The relative density of the three test substances was determined according toEC 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 relative density of Bisisobutyryl peroxide at 20°C is 0.9752.

Description of key information

The relative density of pure Bisisobutyryl peroxide at 20°C is 0.9752.

Key value for chemical safety assessment

Relative density at 20C:
0.975

Additional information