Reaction mass of [3-(trimethoxysilyl) propyl]urea, [3-(dimethoxyethoxysilyl) propyl]urea, [3-(methoxydiethoxysilyl) propyl]urea and [3-(triethoxysilyl) propyl]urea.

Density

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

23 Jan 2012

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)

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

GLP compliance:

yes

Type of method:

oscillating densitimeter

Type:

relative density

Density:

1.114 other: relative density is dimensionless

Temp.:

20 °C

Remarks on result:

other: relative density is dimensionless

Details:

 

	Density (g/cm^3)
First run	1.11389
Second run	1.11388
Mean value	1.11389

 

Result:

Relative density D²⁰₄¹⁾= 1.1139

 

¹⁾Relative density D²⁰₄ = measured density at 20°C (g/cm³): density of water at 4°C (0.99997 g/cm³)

 

Conclusions:

A relative density of 1.11 at 20°C was determined in a reliable study conducted according to an appropriate test protocol, and in compliance with GLP.

Reference 2

Endpoint:

relative density

Remarks:

density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

04 Jun 1999

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)

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

GLP compliance:

yes

Type of method:

pycnometer method

Type:

density

Density:

1.13 g/cm³

Temp.:

20 °C

Type:

relative density

Density:

1.13 other: Relative density is dimensionless.

Remarks on result:

other: Relative density is dimensionless.

Details:

 

The test was performed in duplicate. Individual results are shown in the Table 1.

 

Table 1: Determination of the density of the test substance

Measurement	Temperature of measurement (°C)	Density (g/cm^3)
1	20.0	1.127
2	20.0	1.126
mean:	1.13

 

Table 2: Individual measurements:

	Experiment 1	Experiment 2
Pycnometer empty (A)	27.8897 g	27.8897 g
Temp. Milli-Q water	20.0°C	20.0°C
Pycnometer + Milli-Q water (B)	37.6034 g	37.5981 g
Temp. test substance	20.0°C	20.0°C
Pycnometer + test substance (C)	38.8522 g	38.8416 g

Calculations:

A = weight of empty pycnometer (g)

B = weight of the pycnometer with Milli-Q water (g)

C = weight of the pycnometer with the test substance (g)

D = volume of the pycnometer (g/cm³)

SMW = density of water at the test temperature (g/cm³) (CRC Handbook of Chemistry and Physics, 1981)

 

1.     SMW (resulting from the test temperature) = 0.9982 g/cm³

2.     Volume of pycnometer = D = (B - A) / SMW

Exp. 1: D = 9.7312 cm³

Exp. 2: D = 9.7259 cm³

Mean D = 9.729 cm³

3.     Density of test substance = (C - A_mean) / D_mean

Exp. 1: density = 1.127 g/cm³       

Exp. 2: density = 1.126 g/cm³

Mean density = 1.13 g/cm³

 

Conclusions:

A density of 1.13 g/cm³ at 20°C was determined in a reliable study conducted according to an appropriate test protocol, and in compliance with GLP.

Description of key information

Density 1.13 g/cm³ at 20°C

Additional information

A density value of 1.13 g/cm³ at 20°C was determined by pycnometer method according to OECD Guideline 109. This is supported by a value of 1.11 g/cm³ at 20°C determined by another density study according to OECD Guideline 109. The supporting result is in good agreement with the key study.