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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:
12 December 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
The study was conducted according to an internationally recognised method, and under GLP. The test substance is adequately characterised. Therefore full validation applies.
Qualifier:
according to
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Version / remarks:
2012
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.3 (Relative Density)
Version / remarks:
2008
Deviations:
no
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. certificate)
Remarks:
Inspected on 4,5 and 6 July 2016/ Signed on 10 January 2017
Type of method:
pycnometer method
Key result
Type:
relative density
Density:
ca. 1.157 other: no dimension
Temp.:
20 °C
Remarks on result:
other: density= 1156.7 kg/m3

Calculation:

Density at 20°C was calculated using the following formula: Density= (M1 +A)/(M2 +A) x r

With    M1: apparent mass of test item necessary to fill the flask at 20°C

M2: apparent mass of water necessary to fill the flask at 20°C

r: water density at 20°C = 998.2 kg/m3as published by the CRC Handbook of Chemistry and Physics, 90rd Edition 2009

A: correction due to air buoyancy

A =dax M2

da: air relative density (0.0012), value influenced by atmospheric pressure (but usual variations do not affect results of density)

M1 = m1 – m0

M2 = m2 – m0

m0: measured mass of empty pycnometer

m1: measured mass of pycnometer + test item

m2: measured mass of pycnometer + water

 

The relative density D204is the ratio between the density of the test item determined at 20°C, and the density of water at 4°C which is 1000 kg/m3. The relative density has no dimension.

Results:

Results of the two determinations are reported in the following table:

Measurement

Determination

1

2

Temperature (°C)

20.0

20.0

Mass of the empty pycnometer (g)(m0)

35.22167

35.22167

Mass of the pycnometer filled with ultrapure water (g)(m2)

60.15084

60.15084

Mass of the pycnometer filled with the test item (g)(m1)

64.10979

64.11858

Density of the test item (kg/m3)

1156.5

1156.9

Mean Density (kg/m3)

1156.7 +/-0.3

Conclusions:
The density of the test item was determined to be 1156.7 kg/m3 at 20.0 +/- 0.1°C (mean of two determinations).
The relative density of the test item was determined to be D204 = 1.157.
Executive summary:

The study was performed in order to determine the density of test item according OECD 109, resp. EU A.3 guideline, using a pycnometer.

The density of the test item was determined to be 1156.7 kg/m3 at 20.0 +/- 0.1°C (mean of two determinations).

The relative density of the test item was determined to be D204 = 1.157.

Description of key information

The density of test item was determined to be 1156.7 kg/m3 (relative density D=1.157) at 20°C.

(mean value of two independent determinations)

Key value for chemical safety assessment

Relative density at 20C:
1.157

Additional information

A fully reliable experimental study, conducted according to OECD 109/ EU A3 guideline is available.

It is considered as a key study, and the result is retained as key data.