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Physical & Chemical properties

Density

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Endpoint:
relative density
Type of information:
not specified
Adequacy of study:
weight of evidence
Study period:
1978
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
no guideline required
Principles of method if other than guideline:
Data collected from literature search to use in weight of evidence approach.
Type:
relative density
Density:
1.715
Temp.:
15 °C
Endpoint:
relative density
Type of information:
not specified
Adequacy of study:
weight of evidence
Study period:
2000
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
no guideline required
Principles of method if other than guideline:
Data collected from literature search to use in weight of evidence approach.
Type:
relative density
Density:
1.702
Temp.:
25 °C
Endpoint:
relative density
Type of information:
not specified
Adequacy of study:
weight of evidence
Study period:
2017
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
no guideline required
Principles of method if other than guideline:
Data collected from literature search to use in weight of evidence approach.
Type:
relative density
Density:
1.71
Temp.:
20 °C
Endpoint:
relative density
Type of information:
not specified
Adequacy of study:
weight of evidence
Study period:
1977
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
no guideline required
Principles of method if other than guideline:
Data collected from literature search to use in weight of evidence approach.
Type:
relative density
Density:
1.717
Temp.:
15 °C
Endpoint:
relative density
Type of information:
not specified
Adequacy of study:
weight of evidence
Study period:
1979
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
no guideline required
Principles of method if other than guideline:
Data collected from literature search to use in weight of evidence approach.
Type:
relative density
Density:
1.71
Temp.:
20 °C
Endpoint:
relative density
Type of information:
not specified
Adequacy of study:
weight of evidence
Study period:
1980
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
no guideline required
Principles of method if other than guideline:
Data collected from literature search to use in weight of evidence approach.
Type:
relative density
Density:
1.702
Temp.:
25 °C

Description of key information

The relative density of hexachlorocyclopentadiene is 1.710 at 20°C.

Key value for chemical safety assessment

Relative density at 20C:
1.71

Additional information

A literature search of available information for the relative density of Hexachlorocyclopentadiene identified a number of experimental values. None of the data available gave any experimental information or came from secondary literature. Therefore a Weight of Evidence approach was taken to estimate the melting point and boiling point. In accordance with the recommended approach given by ECHA (2016) and NIST (2015) the value was calculated as follows:

1. Estimates of the mean and standard deviation are computed.

2. Values greater than three times the standard deviations of the mean are excluded.

3. If values have been excluded, the process is repeated with estimates based on the remaining values.

Relative density does not show a strictly linear relationship with temperature. However the relative density is consistent at individual temperatures and shows the expected decrease with increasing temperature. Therefore the value that will be used in the dossier is 1.710 at 20°C.