Sodium 2-(1-carboxylatoethoxy)-1-methyl-2-oxoethyl isooctadecanoate

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:

2018-03-23 to 2018-08-23

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

no

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

- Test item: Pationic ISL
- CAS No.: 66988-04-03
- Molecular weight: 450.59 g/mol
- Sum formula: C24H43O6Na
- Identity: 67.8% acid value, 213 saponification value
- Physical state: Yellow viscous liquid
- Storage: 10 °C - 30 °C

Key result

Atm. press.:

1 013.3 hPa

Decomposition:

yes

Decomp. temp.:

>= 240 °C

Remarks on result:

other: No melting point exists above -20 °C.

The DSC measurement with a heating rate of 10 K/min showed no endothermal effect (melting) during heating up in the temperature range -80 - 30 °C.

The result of the DSC measurement is summarised in Table 1.

Table 1: Melting point (DSC measurement)

DSC run	Weigh-in / mg	Starting temperature / °C	Final test temperature / °C	Temperature range (endothermal) / °C	Onset / °C	Crucible	Observations after the measurement
1	17.87	-80	30	-	-	Aluminium with hole	Test item was unchanged

For further clarification a sample of the test item in a glass vial was placed into a fridge and a freezer. After 48 h these samples were evaluated visually (Table 2).

Table 2: Visual results after storage in fridge and freezer

Temperature	+4 °C for 48 h	-21 °C for 48 h
State of sample	Colour unchanged, test item was no longer flowable, but it was also not a hard solid	Colour unchanged, test item was no longer flowable, but it was also not a hard solid (however it was harder than the test item at +4 °C)

The test item was no longer flowable after 48 h in a fridge or freezer. However, the state of the test item was neither solid nor liquid. Due to the results of the DSC meaurement and the visual inspection at lower temperatures, it was concluded that the test item started to solidify below ambient temperature but had no melting point above -20 °C (no solidification was observed above -20 °C).

Conclusions:

No melting point was measured above -80 °C. However, since melting may be hindered at low temperatures due to supercooling it is assumed that no melting point exists above -20 °C.

Executive summary:

The melting point of the test item was determined by DSC measurement according to OECD 102. No melting point was measured above -80 °C. However, since melting may be hindered at low temperatures due to supercooling it is assumed that no melting point exists above -20 °C.

Description of key information

The melting point of the test item was determined by DSC measurement according to OECD 102. No melting point was measured above -80 °C. However, since melting may be hindered at low temperatures due to supercooling it is assumed that no melting point exists above -20 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

-20 °C