2-Propenoic acid, homopolymer

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:

From 2016-08-24 to 2017-01-27

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:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

2015-07-28

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

- Analytical purity: >=99%
- Purity test date: 24 August 2016
- Lot/batch No.: BA5H22021
- Expiration date of the lot/batch: 24 August 2017
- Appearance: Colourless limpid liquid
- Storage: In darkness at room temperature

Key result

Melting / freezing pt.:

<= -60 °C

Atm. press.:

1 013 hPa

Decomposition:

no

Three assays were performed during the test. For the melting point, two assays complied with the accuracy criterion. Only these assays are presented in the following pages.

 

Assay No. 2

Gas used: Nitrogen

Ventilation: No

Crucible used: Aluminium, 120 μL, with lid

Mass of test item: 38.81 mg

Programmation: Phase 1: Cooling phase from about 25 °C to -100 °C

Isotherm at about -100 °C for 15 min

Phase 2: Heating phase from -100 °C to 25 °C at 5 °C/min

Isotherm at 25 °C for 15 min

Observation: An endothermic peak was observed at -72.7 °C and may correspond to the melting point of the test item.

 

Assay No. 3

Gas used: Nitrogen

Ventilation: Yes

Crucible used: Aluminium, 120 μL, with lid

Mass of test item: 41.09 mg

Programmation: Phase 1: Cooling phase from about 25 °C to -60 °C

Isotherm at about -60 °C for 30 min

Phase 2: Heating phase from -60 °C to 25 °C at 10 °C/min

Isotherm at 25 °C for 5 min

Observation: An endothermic peak was observed at -72.3 °C and may correspond to the melting point of the test item.

Conclusion

An endothermic peak was observed at a mean temperature of -72.5 °C but due to its very low intensity, it is difficult to consider this endothermic phenomenon as the melting point

of the test item. On the basis of this result, the melting point of the test item is considered to be below -60 °C.

Conclusions:

The melting point of the test item is considered to be below -60 °C.

Executive summary:

The melting point of the REACH substance was determined in a GLP-compliant study performed in accordance with EC A.1 method and OECD Guideline No. 102, using Differential Scanning Calorimetry (DSC). An endothermic peak was observed at a mean temperature of -72.5 °C but due to its very low intensity, it is difficult to consider this endothermic phenomenon as the melting point of the test item. As a result, the melting point of the test item is considered to be below -60 °C.

Description of key information

The melting point of the REACH substance was determined in a GLP-compliant study performed in accordance with EC A.1 method and OECD Guideline No. 102, using Differential Scanning Calorimetry (DSC). An endothermic peak was observed at a mean temperature of -72.5 °C but due to its very low intensity, it is difficult to consider this endothermic phenomenon as the melting point of the test item. As a result,the melting pointof the test item is considered to be below -60 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

-60 °C

Additional information

The melting point of the substance was determined in one GLP-compliant study performed in accordance with standard methods, without deviations. The study is considered as reliable (Klimisch 1) and was selected as key study for the endpoint.