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EC number: 243-169-8 | CAS number: 19583-54-1
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2018-05-04 to 2018-09-19
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: Thermal Stability (OECD 113)
- Version / remarks:
- 1981
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- signed 2017-02-28
- Type of method:
- differential scanning calorimetry
- Specific details on test material used for the study:
- Storage Conditions: -15 °C to 40 °C
- Atm. press.:
- >= 1 004 - <= 1 017 hPa
- Decomposition:
- yes
- Decomp. temp.:
- > 120 °C
- Conclusions:
- Melting and Boiling Point
No definitive signs of melting/boiling of the test item 2-ethylhexanoic acid, iron salt were observed by differential scanning calorimetry (DSC) measurements (open glass crucible under nitrogen, up to 600 °C, heating rate of 10 K/min) and by the capillary method (up to 350 °C, heating rate of 10 K/min). The measurements were performed according to Regulation EC No. 440/2008 Method A.1./A.2. and OECD Test Guidelines 102/103 (1995) at atmospheric pressure (994 – 1006 hPa). It is assumed that the test item decomposes with a mass loss of ~80 % at temperatures >120 °C.
Thermal Stability
In the temperature range of 100 °C to 340 °C different endothermic effects were observed. No exothermic effects were detected until the maximum test temperature of 600 °C, only a pressure rise at approx. 350 °C was observed.
Reference
Melting and Boiling Point (DSC)
Six endothermic effects were detected in the temperature ranges of -10 °C to 10 °C (melting of water (impurity)), 60 °C – 180 °C (decomposition under boiling) and 190 °C – 280 °C, 380 °C – 450 °C, 450 °C – 500 °C and 500 °C – 590 °C (possible phase transition, decomposition).
Results of the DSC-measurements
No. |
Sample weight / mg |
Onset of Effect / °C |
Range of effect / °C |
Weight loss / mg |
Atmospheric pressure / hPa |
PN15771 |
10.02 |
-1.73 |
-10 to 10 (endo) |
8.07 |
1000.0 |
PN15794 |
8.01 |
-4.37 |
-10 to 10 (endo) |
6.29 |
999.2 |
It is not possible to assign any of the observed endothermic effects definitely to a melting of the test item.
There is no boiling of the test item observed. However, a mass loss of approx. 80 % was observed during measurement. This may due to the decomposition and boiling of decomposition products of 2-ethylhexanoate. The iron decomposition products are still remain as residue in the test crucible.
Measurements by the Test Tube
For verification of the DSC resultsthe test item was additionally tested in a test tube.In the temperature range of -80 to approx. -60 °C the test item was solid. The appearance of the test item during warming up was between -50 °C and -15 °C very stringy mass and at 25 °C black viscous liquid. The test item shows a softening in the temperature range of approx. -55 °C to -50 °C.
Measurements by the Capillary Method
For verificationof the DSC results the test item was additionally tested with the capillary method. At 120 °C the colour of the test item changed to brown. At approx. 128 °C bubbles, formation of gas and rise of the test item were observed. Above 150 °C strong bubbles were detected. In the temperature range of 250 °C to ~330 °C the colour of the test item was changed to grey/brown and turbid. The measurement was stopped at 350 °C with a dark grey residue remaining in the capillary. Neither a melting nor a boiling of the test item could be observed. It is assumed, that the test item decomposes at temperatures >120 °C. Results correlate with the DSC measurement in an open crucible.
Thermal Stability (DSC)
In the DSC run PN15599 three endothermic effects were observed in the temperature ranges of 120 °C to 160 °C, 160 °C to 190 °C and 300 °C to 330 °C. In the DSC run PN15600 one endothermic effect was observed in the temperature range of 180 °C to 200 °C. In the DSC run PN15665 two endothermic effects were observed in the temperature range of 100 °C to 150 °C and 170 °C to 200 °C. No exothermic effects were detected until the maximum test temperature of 600 °C, only a pressure rise at approx. 350 °C was observed.
Results of the DSC-measurements
No. |
Sample weight / mg |
Start of effect / °C |
Energy*/ (J/g) |
PN15599 |
9.87 |
120 |
+10 (endothermic) |
PN15600 |
17.54 |
180 |
+10 (endothermic) |
PN15665 |
11.19 |
100 |
+25 (endothermic) |
*Negative energy for exothermic processes, positive energy for endothermic processes
Description of key information
It is assumed that the test item 2-ethylhexanoic acid, iron salt decomposes with a mass loss of ~80 % at temperatures >120 °C, at atmospheric pressure (994 – 1006 hPa) and under nitrogen .
Key value for chemical safety assessment
Additional information
Melting and Boiling Point
No definitive signs of melting/boiling of the test item 2-ethylhexanoic acid, iron salt were observed by differential scanning calorimetry (DSC) measurements (open glass crucible under nitrogen, up to 600 °C, heating rate of 10 K/min) and by the capillary method (up to 350 °C, heating rate of 10 K/min). The measurements were performed according to Regulation EC No. 440/2008 Method A.1./A.2. and OECD Test Guidelines 102/103 (1995) at atmospheric pressure (994 – 1006 hPa). It is assumed that the test item decomposes with a mass loss of ~80 % at temperatures >120 °C.
Thermal Stability
In the temperature range of 100 °C to 340 °C different endothermic effects were observed. No exothermic effects were detected until the maximum test temperature of 600 °C, only a pressure rise at approx. 350 °C was observed.
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