Chlorodimethyloctadecylsilane

Density

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

relative density

Type of information:

(Q)SAR

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification

Justification for type of information:

QSAR prediction

Principles of method if other than guideline:

The result was obtained using an appropriate QSAR method (see attached QMRF and QPRF for details).

GLP compliance:

no

Type of method:

other: QSAR

Type:

density

Density:

0.86 g/cm³

Temp.:

20 °C

Type:

relative density

Density:

0.86 other: Relative density is dimensonless

Remarks on result:

other: Relative density is dimensonless

Conclusions:

A density value of 0.86 g/cm³ at 20 °C has been obtained for the test substance using an accepted calculation method. The result is considered reliable.

Reference 2

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

24 Feb to 25 Feb 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Qualifier:

according to guideline

Guideline:

other: DIN EN ISO 787-10

GLP compliance:

no

Type of method:

pycnometer method

Type:

relative density

Density:

0.922 other: Relative density is dimensionless

Remarks on result:

other: Relative density is dimensionless

Type:

density

Density:

0.922 g/cm³

Temp.:

20 °C

Calculation

ρ_m= ρ₁ x (m₂-m₁) / (m₄-m₁) – (m₃-m₂)

 

ρ_m= Density of test substance at 20 °C [g/ml]

ρ₁= Density of displacement liquid at 20 °C [g/ml] = 0.7819

m₁= Mass of pycnometer [g]

m₂= Mass of pycnometer + test substance [g]

m₃= Mass of pycnometer + test substance + displacement liquid [g]

m₄= Mass of pycnometer + displacement liquid [g]

 

Results

Test	Density 20 °C [g/cm^3]	Relative density D20/4*
1	0.930	0.930
2	0.920	0.920
3	0.916	0.916
Mean value	0.922	0.922

 

* The relative density D_20/4 is the ratio between the measured density of the test substance at 20 °C and the density of water at 4 °C (= 0.99997 g/cm³). The relative density has no dimension.

Conclusions:

A density value of 0.992 at 20°C was determined in a reliable study conducted according to an appropriate test protocol. It was not compliant with GLP.

Description of key information

Chlorodimethyloctadecylsilane:
Density: 0.922 g/cm³ at 20°C (EU Method A.3)
Relative density: 0.922 (EU Method A.3)

Key value for chemical safety assessment

Relative density at 20C:

0.922

Additional information

A density value of 0.922 g/cm³ at 20°C was determined using the pycnometer method according to EU Method A.3. In a supporting study a density value of 0.86 g/cm³ at 20 °C was obtained using an accepted calculation method (QSAR). The result is considered to be reliable.