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Physical & Chemical properties

Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
28 June 2001 to 3 October 2001
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.3 (Relative Density)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
pycnometer method
Key result
Type:
relative density
Density:
1.55 other: dimensionless
Temp.:
20 °C

Table 1: Results

   Sample 1  Sample 2  Sample 3
   P1 (psi)  P2 (psi)  VSAMP (cm3)  P1 (psi)  P2 (psi)  VSAMP (cm3)  P1 (psi)  P2 (psi)  VSAMP (cm3)
 1  19.805  10.983  0.728  19.750  10.911  0.794  19.859  11.055  0.661
 2  19.755  10.958  0.755  19.738  10.903  0.796  19.915  11.081  0.669
 3  19.800  10.982  0.725  19.735  10.902  0.795  19.991  11.122  0.671
 Average VSAMP (cm3)      0.725      0.795      0.667
 SD      0.003      0.001      0.005
 %RSD      0.411      0.137      0.819
 WTSAMP (g)      1.125      1.235      1.037
 Absolute density (g/cm3)      1.552      1.554      1.555
 Average absolute density (g/cm3)      1.55            
 SD      0.001            
 %RSD      0.09            
 Relative density D204      1.55            

VSAMP = VCELL - (VEXP/((P1/P2)-1))

Absolute density = WTSAMP/VSAMP

Relative density = Absolute density / 1.000 g/cm3

where:

P1 and P2 are pressure measurements taken by the pycnometer

VCELL and VEXP are cell constants equal to 8.520 cm3 and 6.259 cm3

VSAMP is the skeletal volume of the sample in cm3

WTSAMP is the sample weight

Calculations

VSAMP = 8.52 - (6.259/((19.800/10.982)-1)) = 0.725 cm3

Density = 1.125 / 0.725 = 1.552 g/cm3

Relative density = 1.553 / 1.000 = 1.55

Conclusions:
Under the conditions of the test, the relative density of the test material was determined to be 1.55 using the pycnometer method.
Executive summary:

In a GLP compliant density study conducted in accordance with standardised guideline EU Method A.3, the density of the test material was determined using the pycnometer method. Under the conditions of the test, the relative density of the test material was determined to be 1.55.

Description of key information

The relative density of the test material was determined to be 1.55 according to a study performed in line with EU Method A.3.

Key value for chemical safety assessment

Relative density at 20C:
1.55

Additional information

The key study (Chee-Chue, 2001) was performed in line with GLP and standardised guidelines with a sufficient level of detail to assess the quality of the study. The study was performed to a good standard and was assigned a reliability score of 1 using the principle for assessing data quality as set out in Klimisch (1997).

The supporting study (Berkel et al., 1987) was not performed in line with GLP and contained insufficient detail to assess the quality of the study. The study was assigned a reliability score of 4 using the principle for assessing data quality as set out in Klimisch (1997).