Neodecanoic acid, zirconium 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.:

1 004.1 hPa

Decomposition:

ambiguous

Decomp. temp.:

ca. 365 °C

Remarks on result:

other: no distinct melting/boiling point could be observed

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

In both DSC runs exothermic effects were observed in the temperature ranges from 100 °C through 180 °C (energy release: -10 J/g) and from 220 °C through 350 °C (energy release: -30 J/g). Apart from that, an endothermic effect was detected in the temperature range from 370 °C through 520 °C

Results of the DSC-measurements

No.	Sample weight [mg]	Onset of Effect [°C]	Range of effect [°C]	Weight loss	Atmospheric pressure [hPa]
PN15380	12.55	100 220 406.61	100 – 180 (exo) 220 – 350 (exo) 380 – 520 (endo)	6.78 mg 54 %	1004.1
PN15381	13.74	100 220 417.36	100 – 180 (exo) 220 – 310 (exo) 370 – 520 (endo)	7.57 mg 55 %	1004.1

During the heating phase one endothermic effect was observed in the temperature range of 380 – 520 °C, which cannot be assigned to the melting of the test item, because exothermic effects are observed previously at 100 °C and 220 °C. Thus, no melting or boiling of the test item could be detected up to approx. 100 °C under atmospheric pressure.

For verification of the DSC results the test item was additionally tested in a test glass. At ~170 °C, white mist started to develop at the surface of the test item. At ~365 °C the colour of the test item changed to light brown-black and the test item clumped strongly together. No melting or boiling was observed in the temperature range from -45 °C up to 365 °C.

Thermal stability (DSC)

Starting at a temperature of 470 °C an exothermic effect with an energy release of -240 J/g was observed. Apart from that, a second exothermic effect starting at 560 °C with an energy release of >-60 J/g was observed in DSC run PN15336. This effect was not found in PN15335 where the crucible burst at approx. 550 °C.

Results of the DSC-measurements

No.	Sample weight [mg]	Start of effect [°C]	Energy* [J/g]
PN15335	6.68	470	-240 (exothermic)
PN15336	7.50	470 560	-120 (exothermic) > -60 (exothermic)

*Negative energy for exothermic processes

Conclusions:

Melting and Boiling Point:
Neither a melting nor a boiling of the test item could be definitely observed by differential scanning calorimetry according to Regulation EC No. 440/2008 Method A.1./A.2 and OECD Test Guidelines 102/103 (1995) at atmospheric pressure (1004 hPa) as well as by visual observation of the test item being heated in a test glass. The test substance decomposes with a mass loss of ~55 % starting at 365 °C before melting and boiling.

Thermal Stability:
The test item showed an exothermic effect starting at 470 °C with an energy release of -240 J/g and another exothermic effect starting at 560 °C with an energy release of > -60 J/g according to the differential scanning calorimetry measurements according to OECD Test Guideline 113 (1981).

Description of key information

The test substance decomposes with a mass loss of ~55 % starting at approx. 365 °C before melting and boiling.

Additional information

Melting and Boiling Point:

Neither a melting nor a boiling of the test item could be definitely observed by differential scanning calorimetry according to Regulation EC No. 440/2008 Method A.1./A.2 and OECD Test Guidelines 102/103 (1995) at atmospheric pressure (1004 hPa) as well as by visual observation of the test item being heated in a test glass.

The test substance decomposes with a mass loss of ~55 % starting at approx. 365 °C before melting and boiling.

Thermal Stability:

The test item showed an exothermic effect starting at 470 °C with an energy release of > -240 J/g and another exothermic effect starting at 560 °C with an energy release of > -60 J/g according to the differential scanning calorimetry measurements according to OECD Test Guideline 113 (1981).