Iron orthophosphate

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:

30 September 2009 to 31 October 2009.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

> 723 K

Atm. press.:

other: not reported

Decomposition:

no

Sublimation:

no

Thermographic data for Determinations 1 and 2 are shown in the following tables respectively:

Table:  Thermographic Data – Determination 1

Thermal Event	Interpretation	Temperature
		ºC	K
Endotherm	Loss of volatiles	225.84	499

 

Table 4.     Thermographic Data – Determination 2

Thermal Event	Interpretation	Temperature
		ºC	K
Endotherm	Loss of volatiles	225.45	499

Please see Attachment 1 for Thermogram data.

Conclusions:

The test material was determined to have a melting temperature greater than 723 K. Although the test material was identified as undergoing loss of volatiles (water) at approximately 499 K, this thermal event was not associated with a phase transition (i.e. melting) of the test material.

Description of key information

Melting point: >450 °C (EU Method A.1,GLP)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

450 °C

Additional information

The melting/freezing temperature of iron orthophosphate was determined to be greater than 723 K (450°C) according to EU Method A.1 and GLP using the differential scanning calorimetry (Walker, 2009). Although the test material was identified as undergoing loss of volatiles (water) at approximately 499 K, this thermal event was not associated with a phase transition (i.e. melting) of the test material.