2-ethylhexanoic acid, copper salt

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2018-04-03 to 2018-05-07

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline 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: Room temperature, tightly closed container, dry

Atm. press.:

1 005.1 hPa

Decomposition:

yes

Decomp. temp.:

ca. 230 °C

Melting and Boiling Point (DSC and Measurement in Test Glass)

In both DSC runs an endothermic effect was observed in the temperature range from 220 °C through 310 °C. No further endothermic or exothermic effect was detected up to 600 °C.

Results of the DSC-measurements

The observed endothermic effect cannot be definitely assigned to melting or boiling of the test item.

No.	Sample weight [mg]	Onset of Effect [°C]	Range of effect [°C]	Weight loss	Atmospheric pressure [hPa]
PN15383	17.27	254.11	230 – 310 (endo)	15.91 mg 92 %	1005.1
PN15384	22.75	251.97	220 – 310 (endo)	19.31 mg 85 %	1005.1

For verification of the DSC results the test item was additionally tested in a test glass. At approx. 230 °C the colour of the test item changed to brown-black and the test item clumped together. The test item was further heated up to approx. 235 °C. No melting or boiling was observed up to this temperature.

In view of this observation, the endothermic effects found in the DSC measurements cannot be assigned to boiling or melting of the test item. The test substance decomposes starting at approx. 230 °C with a mass loss of ≥ 85 % before melting and boiling.

Thermal stability (DSC)

An endothermic effect starting at 220 °C was observed. At 320 °C the base line of the DSC dropped off and the DSC signal became noisy so that the thermograms cannot be interpreted without doubt at temperatures above 320 °C.

Results of the DSC-measurements

No.	Sample weight [mg]	Start of effect [°C]	Energy* [J/g]
PN15341	7.97	220	> 130 (endothermic)
PN15366	5.57	220	> 90 (endothermic)

* Negative energy for exothermic processes

Conclusions:

Melting and Boiling Point:
Neither a melting nor a boiling of the test item could be observed by differential scanning calorimetry according to Regulation EC No. 440/2008 Methods A.1./A.2. and OECD Test Guidelines 102/103 (1995) at atmospheric pressure (1005 hPa) as well as by visual observation of the test item being heated in a test glass.
The test substance decomposes starting at approx. 230 °C with a mass loss of ≥ 85 % before melting and boiling.

Thermal Stability:
The test item showed an endothermic effect starting at 220 °C, but no exothermal effect up to 330 °C in the differential scanning calorimetry measurements according to OECD Test Guideline 113 (1981). At temperatures above 330 °C the results of the DSC measurements cannot be interpreted due to a noisy signal.

Description of key information

The test substance decomposes starting at approx. 230 °C with a mass loss of ≥ 85 % before melting and boiling.

Additional information

Melting and Boiling Point:

Neither a melting nor a boiling of the test item could be observed by differential scanning calorimetry according to Regulation EC No. 440/2008 Methods A.1./A.2. and OECD Test Guidelines 102/103 (1995) at atmospheric pressure (1005 hPa) as well as by visual observation of the test item being heated in a test glass.

The test substance decomposes starting at approx. 230 °C with a mass loss of ≥ 85 % before melting and boiling.

 

Thermal Stability:

The test item showed an endothermic effect starting at 220 °C, but no exothermal effect up to 330 °C in the differential scanning calorimetry measurements according to OECD Test Guideline 113 (1981). At temperatures above 330 °C the results of the DSC measurements cannot be interpreted due to a noisy signal.