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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:
January - February 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Qualifier:
according to guideline
Guideline:
EU Method A.3 (Relative Density)
GLP compliance:
no
Type of method:
air comparison pycnometer (for solids)
Specific details on test material used for the study:
Lot 926907
Type:
density
Density:
1.76 g/cm³
Temp.:
20 °C
Key result
Type:
relative density
Density:
1.76
Temp.:
20 °C
Remarks on result:
other: relative density is calculated as: measured density of test substance (kg/m³) at 20°C / density of water at 4°C = 999.972 kg/m³ (value taken from Handbook of Chemistry and Physics, 64 Ed., 1984)

The loss on drying of the test substance was 21.9%.

Test

# 1

# 2

mass [g]

3.9836

3.8739

temperature (ambient)

run

22°C

22°C

volume [cm³]

#1

2.2649

2.2044

 

#2

2.2635

2.2063

 

#3

2.2666

2.2023

 

#4

2.2683

2.2074

 

#5

2.2731

2.2042

 

#6

2.2674

 

 

#7

2.2685

 

average volume [cm³]

(of last 5 runs)

2.2688

2.2049

density [g/cm³]

1.7558

1.7570

The temperature inside the pycnometer chamber has previously been found to be 5 ±2 °C above ambient. Therefore the temperature of the test substance during measurement was 27 °C (± 2 K) and a correction was applied to calculate the density at 20 °C.

For solid organic compounds the cubic thermal expansion coefficient γ is in the range of

γ= 0.0002 K-1 - 0.0004 K-1 (D'Ans Lax, Taschenbuch für Chemiker und Physiker, Band I, 3.Aufl., 1967).

Using an average value of γ = 0.0003 K-1 the volume (V T ) measured at the temperature of the chamber TChis extrapolated to the volume (V 20° ) at 20 °C according to the formulae:

 

V 20° = V T -ΔVT-20  and ΔVT-20°= VT x γ x (TCh-20°)

Test

# 1

# 2

temperature difference [K]

TCh – 20 °C

7

7

volume difference [cm³]

for _T

0.0048

0.0046

corrected volume [cm³]

(20 °C)

2.2640

2.2003

density [g/cm³]

(20 °C)

1.7595

1.7606
Conclusions:
The density of nitroguanidine extrapolated at 20 °C is ρ 20 = 1.760 g/cm³ or 1760 kg/m³ .
Executive summary:

The density and relative density of the test item was determined according to OECD guideline no. 109 [adopted on 27 July 1995] and EU test method A.3 [Directive 92/69/EEC, Official Journal L 383 A 1992] with the gas displacement pycnometer.

The density of the test substance extrapolated at 20 °C is ρ 20 = 1.760 g/cm³ or 1760 kg/m³ .

The relative density of the test substance was calculated as: D420= 1.760

Description of key information

The density of nitroguanidine extrapolated at 20 °C is ρ 20  = 1.760 g/cm³ or 1 760 kg/m³.

Key value for chemical safety assessment

Relative density at 20C:
1 760

Additional information