Reaction mass of 2-ethylhexyl (3-isocyanato-4-methylphenyl)carbamate and 2-ethylhexyl (5-isocyanato-2-methylphenyl)carbamate and 2-ethylhexyl (3-isocyanato-2-methylphenyl)carbamate

Density

Link to relevant study record(s)

Reference

Endpoint:

density, other

Type of information:

experimental study

Adequacy of study:

key study

Study period:

15. May 2018 to 16. May 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:

Council 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.

Dynamic viscosity of test material:

Pre-test for viscosity
At first the test item was inspected for the viscosity. It was checked if the test item was flowable and if it was possible to inject the test item with a one way syringe.
The test item was flowable and it was possible to inject the test item with a one way syringe.

Key result

Type:

density

Density:

1.072 g/cm³

Temp.:

20 °C

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	32.5643	57.5903	59.4490
Temperature in °C	20.2	20.2	19.6
Second Determination
Weighing #	m1	m2	m3
Item	Pycn. Empty	Pycn. + H2O	Pycn. + test item
Mass in g	32.5645	57.5907	59.4451
Temperature in °C	20.2	20.2	20.0

Pycn. = Pycnometer

 

Calculation of Results

Equations

Density of Test Item

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

m3 – m1

ρ = ---------------------- * ρH2O

m2 – m1

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:

2*∆m*100%          2*∆m*100%

∆ρ = ---------------------- + ----------------------

m3 – m1                 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:

sd*100

RSD = --------------------

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	20.2	°C		0.1
Density of water	0.998203	g/cm^3	2.00%	0.0002
Volume of Pycnometer	25.0711	cm^3
Density of Test item	1.0723	g/cm^3	0.0046%	0.0000
Second Determination			Error rel.	Error abs.
Temperature	20.2	°C		0.1
Density of water	0.998203	g/cm^3	2.00%	0.0002
Volume of Pycnometer	25.0713	cm^3
Density of Test item	1.0722	g/cm^3	0.0046%	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/cm^3	Error of Determ. in g/cm^3
1	1.0723	0.0000
2	1.0722	0.0000

 

Results – Mean Values

Parameter	Value	Unit	Standard Deviation	Relative Standard Deviation
Volume of Pycnometer	25.07	cm^3	0.0001	0.00%
Density of Test item	1.0723	g/cm^3	0.0001	0.01%
Density of Test Item	1072.3	kg/m^3	0.1	0.01%
Relative Density of Test Item	1.0723		0.0001	0.01%

 

Conclusions:

The density of the test item Trixene AS was calculated as 1.0723 ± 0.0001 g/cm3 at 20.0 ±0.4 °C.
This value is the mean of two independent determinations ± the standard deviation.
Standard deviation shows very good correlation of the two determinations

Executive summary:

Determination of the Density of Trixene AS according to OECD 109 resp. EU A.3

 

Findings and Results:

Using the pycnometer method, a density of 1.0723 ± 0.0001 g/cm3 at 20.0 ± 0.4 °C was measured. This value is the mean of two independent determinations ± the standard deviation. Standard deviation shows very good correlation of the two determinations.

Description of key information

A density of 1.0723 ± 0.0001 g/cm3 at 20.0 ± 0.4 °C was measured.

Key value for chemical safety assessment

Relative density at 20C:

1.072

Additional information

Using the pycnometer method, a density of 1.0723 ± 0.0001 g/cm3 at 20.0 ± 0.4 °C was measured. This value is the mean of two independent determinations ± the standard deviation. Standard deviation shows very good correlation of the two determinations.