1-ethylazepan-2-one

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:

26 Mar - 19 Apr 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

adopted in March 04, 2016

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

adopted in July 27, 1995

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

adopted in March 1998

GLP compliance:

yes

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

Test item storage:
At room temperature protected from light

Melting / freezing pt.:

< -19 °C

Atm. press.:

998.3 hPa

Remarks on result:

other: storage experiment in the freezer

Preliminary Test

TGA: Starting at 175 °C, the weight of the sample decreased significantly. However at 549 °C the sample weight only decreased by 15%. The weight of the test item was therefore considered incorrect. It happened due to a technical error.

After the experiment, a colourless residue remained in the sample container (original colour: colourless to pale yellow).

Main Study

DSC:

Experiment 1: During cooling no effects were observed which were due to crystallization of the test item (results are archived in the raw data). During heating, an endothermic peak was observed between 25 °C and 125 °C. Based on the weight loss observed during the preliminary test, the endothermic effect was due to evaporation of volatile components. An endothermic peak was observed between 150 °C and 275 °C. The extrapolated onset temperature of the peak was 233.040 °C. The endothermic effect was most likely obtained due to boiling of the test item. The extrapolated onset temperature was not used for the calculation of the boiling temperature, since the test item was most likely evaporated before the boiling temperature was reached. After the experiment it was observed that the test item had evaporated from the sample container.

An additional investigation of the melting temperature of the test item was performed placing two subsamples of the test item for 21 hours at -19.0 ± 0.2 °C and at -80.3 ± 1.0 °C respectively. It was observed after storage that the test item was a liquid (≤ -15 °C freezer) and a solid (≤ -75 °C freezer). According to this it was concluded that the melting temperature of the test item is < -19.0 °C (< 254.2K).

 

Conclusion

The melting temperature of N-ethylcaprolactam was determined by DSC.

The melting temperature of the test item was < -19.0 °C (< 254.2K) applying a storage experiment in the freezer.

The atmospheric pressure was 998.3 ± 2.7 hPa.

Description of key information

< -19 °C at 998.3 hPa (DSC, OECD 102)

Additional information

The melting temperature of the test item was < -19.0°C (< 254.2K) applying a storage experiment in the freezer.

The atmospheric pressure was 998.3 ± 2.7 hPa.