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Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

9th May 2005

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Date of inspection: December 2002; Date of certificate: February 2003

Type of method:

pycnometer method

Type:

relative density

Density:

0.97

Temp.:

20 °C

Results of duplicate determinations of relative density are shown in the following table:

Measurement	Determination
	1	2
Mass of pycnometer (g)	7.6122	7.6125
Mass of pycnometer and distilled water at 20.0ºC (g)	17.8775	17.8772
Mass of pycnometer and test material at 20.0ºC (g)	16.0007	16.0006
Density of water at 20.0ºC (kg/m^3)	998.20	998.20
Density (kg/m^3)	815.70	815.71
Relative density	0.816	0.816

Mean relative density:              0.816
Temperature:                           20.0 ± 0.5ºC

Conclusions:

The relative density of the test material has been determined to be 0.816 at 20.0 ± 0.5°C.

Executive summary:

The relative density for Paraffin waxes (Fischer-Tropsch), full range, C15-50- branched and linear was determined using the pycnometer method, Method A.3 of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC).

A glass pycnometer of 25 ml nominal capacity was cleaned and dried to a constant weight. Distilled water and test material were equilibrated at 20.0 +/-0.5 deg C. A calibration was carried out by determining the mass of distilled water required to fill the pycnometer. The pycnometer was then emptied and dried to constant weight. The mass of test material required to fill the pycnometer was then determined. The relative density was then calculated.

The relative density of the test material has been determined to be 0.816 at 20.0 ± 0.5°C.

Description of key information

relative density of the test material at 20.0 ± 0.5°C (determined using the pycnometer method, EU Method A.3): 0.816 (arithmetic mean of two determinations)

Key value for chemical safety assessment

Relative density at 20C:

0.816