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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:
20. Jun. 2018 to 25. Jun. 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Version / remarks:
OECD Guidelines for the Testing of Chemicals, Method No. 109, adopted 02. Oct. 2012: “Density of Liquids and Solids“
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.3 (Relative Density)
Version / remarks:
Commission Regulation (EC) No 440/2008 of 30. May 2008, published on 31. May 2008, Method A.3: “Relative Density”
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
pycnometer method
Specific details on test material used for the study:
No further details specified in the study report.
Key result
Type:
density
Density:
0.908 g/cm³
Temp.:
20 °C

Findings

Pre-test for viscosity

The test item was flowable but it was not possible to inject the test item with a one way syringe.

 

Measurement

All measured values are given in the following table:

Measured Values

First Determination

 

 

 

Weighing #

m1

m2

m3

Item

Pycn. empty

Pycn. + H2O

Pycn. + test item

Mass in g

36.7420

61.6072

59.4274

Temperature in°C

20.0

20.4

20.2

Second Determination

 

 

 

Weighing #

m1

m2

m3

Item

Pycn. empty

Pycn. +H2O

Pycn. + test item

Mass in g

36.7419

61.6527

59.3410

Temperature in°C

20.0

20.0

20.0

Pycn. = Pycnometer

 

Calculation of Results

Equations

Density of Test Item

The density of the test item was calculated using the following equation:

ρ = [(m3– m1) / (m2– m1)] * ρH2O

 

with

ρ = density in g/cm3

m1= mass of empty pycnometer in g

m2= mass of pycnometer with water in g

m3= mass of pycnometer with test item in g

ρH2O = density of water at test temperature (0.9982 g*cm-3at 20.0 °C)

 

The relative density of the test item has the same number value, but no unit.

 

Calculation of Error

The error of the determination method can be calculated from:

 

∆ρ = [(2*∆m*100%) / m3–m1)] + [(2*∆m*100%) / m2– m1)]

 

with

∆ρ = relative error of the measured density

∆m = absolute error of single weighing (0.0003 g)

 

Calculation of Relative Standard Deviation

The RSD was calculated as followed:

 

RSD = (sd*100) / density mean

 

RSD = Relative Standard Deviation in %

sd = Standard Deviation in g*cm-3

  

The following values were calculated.

Calculated Values

First Determination

 

 

Error rel.

Error abs.

Temperature

20,4

°C

 

0.1

Density of water

0.998098

g/cm3

2.00%

0.0002

Volume of Pycnometer

24.9126

cm3

 

 

Density of Test Item

0.9106

g/cm3

0.0051%

0.0000

Second Determination

 

 

Error rel.

Error abs.

Temperature

20.0

°C

 

0.1

Density of water

0.998203

g/cm3

2.00%

0.0002

Volume of Pycnometer

24.9556

cm3

 

 

Density of Test Item

0.9056

g/cm3

0.0051%

0.0000

rel. = relative; abs. = absolute

 

Presentation of Results

Results of the single determinations with the respective error as well as the mean value and its standard deviation are presented in the following tables:

Results of Single Determinations

Determination

Density in g/cm3

Error of Determ. in g/cm3

1

0.9106

0.0000

2

0.9056

0.0000

 

Results – Mean Values

Parameter

Value

Unit

Standard Deviation

Relative Standard Deviation

Volume of Pycnometer

24.93

cm3

0.0304

0.12%

Density of Test Item

0.9081

g/cm3

0.0036

0.39%

Density of Test Item

908.1

kg/m3

3.6

0.39%

Relative Density of Test Item

0.9081

 

0.0036

0.39%

 

Conclusions:
The density of the test item Petroleum Resins (Kendex 0897) was calculated as 0.9081 ± 0.0036 g/cm3 at 20 ± 0.4 °C. This value is the mean of two independent determinations ± the standard deviation. Standard deviation shows good correlation of the two determinations.
Executive summary:

Determination of the density of Petroleum Resins (Kendex 0897) according to OECD 109 resp. EU A.3

 

Findings and Results:

Using the pycnometer method, a density of 0.9081 ± 0.0036 g/cm3 at 20 ± 0.4 °C was measured. This value is the mean of two independent determinations ± the standard deviation. Standard deviation shows good correlation of the two determinations.

Description of key information

Using the pycnometer method, a density of 0.9081 ± 0.0036 g/cm3 at 20 ± 0.4 °C was measured.

Key value for chemical safety assessment

Relative density at 20C:
0.908

Additional information

Using the pycnometer method, a density of 0.9081 ± 0.0036 g/cm3 at 20 ± 0.4 °C was measured. This value is the mean of two independent determinations ± the standard deviation. Standard deviation shows good correlation of the two determinations.