Diphosphoric acid, copper 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:

Testing was conducted between 12 October 2009 and 10 December 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)

Remarks:

Date of inspection: 15 September 2009, Date of signature: 26 November 2009

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

Sponsor's identification: Copper (II) Pyrophosphate
Description :pale blue powder
CAS number: 10102-90-6
Batch number: A
Date received: 28 August 2009
Storage conditions: room temperature in the dark

Key result

Melting / freezing pt.:

> 723 K

Decomposition:

no

Sublimation:

no

Remarks on result:

other: Although the test material was identified as undergoing loss of volatiles from approximately 425 K and approximately 575 K (during heating), these thermal events were not associated with a phase transition (i.e. melting) of the test material.

Results

Definitive test

Thermal analysis data for Determinations 1 and 2 are shown in the following tables, respectively.

 Thermographic Data – Determination 1

Thermal Event	Interpretation	Temperature
		ºC	K
Endotherms (at least 6)	Start of loss of volatiles End of loss of volatiles	~152.65 ~300.52	~426 ~574

 

Thermographic Data – Determination 2

Thermal Event	Interpretation	Temperature
		ºC	K
Endotherms (at least 6)	Start of loss of volatiles End of loss of volatiles	~151.75 ~301.44	~425 ~575

 

Please see attachment 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 from approximately 425 K and approximately 575 K (during heating), these thermal events were not associated with a phase transition (i.e. melting) of the test material.

Executive summary:

Method

The determination was carried out by differential scanning calorimetry (DSC) using the procedure specified in ASTM E537-86, Method A1 Melting/Freezing Temperature ofCommissionRegulation (EC) No 440/2008 of 30 May 2008.

Conclusion

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 from approximately 425 K and approximately 575 K (during heating), these thermal events were not associated with a phase transition (i.e. melting) of the test material.

Description of key information

The test material was determined to have a melting temperature greater than 723 K / 450°C. 

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

450 °C

Additional information

One key study exists. The melting point of copper (II) pyrophosphate was determined according to EU Method A.1 (Melting / Freezing Temperature) and under the conditions of GLP. The test material was determined to have a melting temperature greater than 723 K / 450°C. Although the test material was identified as undergoing loss of volatiles from approximately 425 K and approximately 575 K (during heating), these thermal events were not associated with a phase transition (i.e. melting) of the test material.