Phosphoric acid, 2-ethylhexyl ester, sodium 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:

2018-02-27 to 2018-03-23

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

>= -50 - <= 0 °C

Atm. press.:

>= 997 - <= 998 hPa

Decomposition:

yes

Decomp. temp.:

>= 229 °C

In the temperature ranges of -50 to -0 °C, 40 to 160 °C, 170 to 220 °C and 220 to 300 °C, four endothermic effects were observed.

Results of the DSC-measurements

No.	Sample weight / mg	Onset of Effect / °C	Range of effect / °C	Weight loss / mg	Atmospheric pressure / hPa	Remark
PN15141	15.57	-13.97 96.52 173.27 287.99	-50 – 0 (endo) 40 – 160 (endo) 170 – 220 (endo) 230 – 300 (endo)	11.46	996.5
PN15197	11.27	-12.60 95.35 173.11 377.86	-40 – 0 (endo) 60 – 160 (endo) 170 – 220 (endo) 220 – 300 (endo)	8.50	997.8

During the cooling phase, no thermic effect could be observed in the DSC-measurements. During the subsequent heating phase a first endothermic effect was observed in the temperature range of -50 to 0 °C, which can be assigned to the softening of the test item. Three further endothermic effects were observed, which can’t be clearly assigned to a boiling of the test item. Thus, the test item was additionally investigated by means of the capillary method.

Therefore, three capillaries were filled with the test item up to a height of 5 mm. The capillaries were heated up from 25 °C to 300 °C with a constant heating rate of 10 K/min in the Stuart melting point apparatus. The test item was visually inspected while increasing the temperature.

At a temperature of 164.2 °C the test item started to boil. At 173.3 °C the appearance of the test item changed to cloudy and greyish. At 229.0 °C the colour of the test item changed to white. This was considered as indication for start of decomposition.

 

Conclusions:

The melting range of the substance was determined to be -50 °C to 0 °C at 1013.25 hPa.

Executive summary:

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OCSPP test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry. The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen). Two tests with about 11 – 16 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. In the temperature ranges of -50 to -0 °C, 40 to 160 °C, 170 to 220 °C and 220 to 300 °C, four endothermic effects were observed.During the cooling phase, no thermic effect could be observed in the DSC-measurements. During the subsequent heating phase a first endothermic effect was observed in the temperature range of -50 to 0 °C, which can be assigned to the softening of the test item. Thus, it was concluded that the test item has a melting range of -50 °C to 0°C at 1013.25 hPa.

 

Description of key information

The melting range of the substance was determined to be -50 °C to 0 °C at 997 - 998 hPa.

Additional information

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OCSPP test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry. The test item was weighed out into an aluminium crucible under an inert atmosphere (nitrogen). Two tests with about 11 – 16 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. In the temperature ranges of -50 to -0 °C, 40 to 160 °C, 170 to 220 °C and 220 to 300 °C, four endothermic effects were observed.During the cooling phase, no thermic effect could be observed in the DSC-measurements. During the subsequent heating phase a first endothermic effect was observed in the temperature range of -50 to 0 °C, which can be assigned to the softening of the test item. Thus, it was concluded that the test item has a melting range of -50 °C to 0°C at 997 - 998 hPa.