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Diss Factsheets

Physical & Chemical properties

Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2014-02-05 to 2015-05-14
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
EC Method A.3; OECD Method 109
Qualifier:
according to guideline
Guideline:
EU Method A.3 (Relative Density)
Version / remarks:
OECD Method 109
GLP compliance:
yes (incl. QA statement)
Type of method:
pycnometer method
Remarks:
The relative density was determined relative to purified water using a pyknometer at 20 °C. Heavy distillate of petroleum was employed as the displacement liquid.
Key result
Type:
relative density
Density:
1.02
Temp.:
20 °C

Table 1 presents a summary of the duplicate determinations and shows a mean relative density (D420) value of 1.02 (mean of 1.02 and 1.02).

 

Patrameter

Determination 1

Determination 2

w1

19.08318

19.28664
w2

44.81269

44.15462
w3

40.07639

39.55767
w4

22.04627

22.34774
w5

40.66783

40.17546
     
W1

25.72951

24.86798
W2

20.99321

20.27103
W3

2.96309

3.06110
W4

18.62156

17.82772
W5

2.37165

2.44331
 

 

 

ρ1T

0.81429

0.81352
mean ρ1T

0.81390

 
Vs

2.91393

3.00197
D420

1.02

1.02
mean D420

1.02

 

 

Calculations:

mass of pyknometer empty (g) = w1

mass of pyknometer + water (g) = w2

mass of pyknometer + displacement liquid (g) = w3

mass of pyknometer + test substance (g) = w4

mass of pyknometer + test substance + displacement liquid (g) = w5

mass of water to fill pyknometer (g) = w2 - w1 = W1

mass of displacement liquid to fill pyknometer (g) = w3 - w1 = W2

mass of test substance (g) = w4 - w1 = W3

 

 

mass of displacement liquid to fill pyknometer containing W3 g test substance (g) = w5 -w4 =W4

mass of displacement liquid equivalent to W3 g test substance (g) = W2 - W4 = W5

density of displacement liquid = (W2/W1) x ρwT  = ρ1T 

volume of W3 g test substance (mL) = W5 / mean ρ1T value = Vs

relative density of test substance = W3/(Vs x ρw4 ) = D4T

 

where

ρwT is the density of water at the temperature of determination (= 0.998 g/mL)

ρw4 is the density of water at 4°C (= 1.000 g/mL)

ρ1T is the density of the suspending displacement liquid at the temperature of determination (g/mL)

D4T is the relative density of the test substance at the test temperature compared to water at 4°C

Conclusions:
The relative density of the substance was found to be 1.02 at 20°C.
Executive summary:

A study was performed to determine the relative density of the substance. The study was designed in accordance with accepted principles in order to meet the requirements of REACH Regulation (EU) No 1907/2006 of the European Parliament and of the Council.

The method followed is amongst those described in Commission Regulation (EC) No. 440/2008 (Method A.3) and the OECD Guidelines for the Testing of Chemicals (Method 109).

The relative density (D420) of the substance was found to be 1.02.

Description of key information

The relative density (D420) of the substance was found to be 1.02.

Key value for chemical safety assessment

Relative density at 20C:
1.02

Additional information