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Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
05 November 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
method to determine freezing temperature
Key result
Melting / freezing pt.:
< -20 °C
Remarks on result:
other: Test performed at atmospheric pressure although not specific value reported. For both samples the temperature was decreased to the level below -20°C and the freezing point was not reached.

Table 1. Measurements of Et-NENA (Ethyl-2-nitratoethylnitramine) freezing point

Sample No. 1

Sample No. 2

Time[min]

Sample

temperature

[oC]

Time[min]

Sample temperature

[oC]

0

-5,0

0

-5,0

1

-5,5

1

-5,4

2

-6,0

2

-5,7

3

-6,4

3

-6,2

4

-6,8

4

-6,8

5

-7,3

5

-7,4

6

-7,9

6

-7,9

7

-8,4

7

-8,3

8

-8,8

8

-8,6

9

-9,2

9

-8,9

10

-9,5

10

-9,4

11

-9,8

11

-10,1

12

-10,1

12

-10,7

13

-10,5

13

-11,1

14

-10,8

14

-11,6

15

-11,2

15

-12,0

16

-11,7

16

-12,4

17

-12,0

17

-12,8

18

-12,5

18

-13,1

19

-12,9

19

-13,4

20

-13,2

20

-13,7

21

-13,6

21

-14,0

22

-13,9

22

-14,3

23

-14,2

23

-14,7

24

-14,4

24

-15,2

25

-14,7

25

-15,5

26

-15,1

26

-16,0

27

-15,2

27

-16,3

28

-15,5

28

-16,5

29

-15,9

29

-16,8

30

-16,3

30

-16,9

31

-16,5

31

-17,3

32

-17,0

32

-17,8

33

-17,3

33

-18,3

34

-17,8

34

-18,8

35

-18,3

35

-19,2

36

-18,6

36

-19,5

37

-19,1

37

-20,0

38

-19,7

38

-20,5

39

-20,5

39

-20,8

40

-20,6

40

-21,2

41

-21,0

41

-21,8

Conclusions:
The freezing point of Et-NENA has not been reached up to -20ºC.


Executive summary:

A study to determine the freezing point of Et-NENA was conducted in accordance to OECD (102)/EU. A.1 guidelines by the method of crystallization tube in freezing mixture solid CO2/acetone, in GLP conditions. The liquid sample of Et-NENA was poured into a test tube. This tube was placed in an outer tube and set in a Dewar vessel containing freezing mixture. The test item was stirred and the temperature was recorded during cooling. Two measurements were carried out at atmospheric pressure. The freezing point of Et-NENA has not been reached up to the limit of -20°C, which defines a threshold of the freezing point study performance necessity.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
according to guideline
Guideline:
other: National Military Standard of China, Explosive Test Method GJB 772A-97, 1997
GLP compliance:
not specified
Key result
Melting / freezing pt.:
>= 2 - <= 4 °C
Decomposition:
no
Sublimation:
no
Conclusions:
The freezing point of the test item was determined to be between 2 and 4ºC.
Executive summary:

The study to determine the freezing point of the test item was performed according to the GJB772A-1997 standard. The freezing point was determined to be between 2 and 4ºC.

Endpoint:
melting point/freezing point
Type of information:
other: review article
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Principles of method if other than guideline:
Not specified.
GLP compliance:
not specified
Key result
Melting / freezing pt.:
>= 1 - <= 5 °C
Decomposition:
no
Sublimation:
no
Conclusions:
The freezing point of the test item is between 1 and 5ºC.
Executive summary:

The freezing point of the test item is between 1 and 5ºC.

Description of key information

Key study. Method according to OECD 102 / EU Method A.1, GLP study. The freezing point of Et-NENA has not been reached up to -20ºC.

Supporting study. Method according to the GJB772A-1997 standard. The freezing point of the test item was determined to be between 2 and 4ºC.

Supporting study. Secondary literature. The freezing point of the test item is between 1 and 5ºC.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-20 °C

Additional information

Key study: A study to determine the freezing point of Et-NENA was conducted in accordance to OECD (102)/EU. A.1 guidelines, in GLP conditions. The freezing point of Et-NENA was not reached up to -20°C. According to column 2 of REACH Annex VII, the study does not need to be conducted below a lower limit of – 20°C.