Hydrogen peroxide-urea

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 2018-03-20 to 2018-03-26

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study without detailed documentation

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

no

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

> 72.5 °C

Decomposition:

yes

Decomp. temp.:

ca. 80.8 °C

Remarks on result:

other: energy of decomposition: 818.5 J/g

The analysis was carried out in the DSC 1 STAR SYSTEM by Mettler Toledo. A SWISSI M20 crucible was used for the determination. The measuring range was between 25 °C to 300 °C at a heating rate of 2.0 °C/min. The analysis was performed as a duplicate determination. The decomposition of the test item releases an average energy of 818.5 J/g. The onset temperature of melting is an average 72.5 ° C. The decomposition temperature is at an average of 80.8 °C.

Table 1. Individual measurements and results

	Onset (melting point) [°C]	Energy (decomposition) [J/g]	Decomposition temperature [°C]
Measurement 1	73.46	841.82	80.77
Measurement 2	71.56	795.25	80.91
Mean	72.5	818.5	80.8

Table 2. Crucible leak test

	m (initial weight) [mg]	m (weight after the test) [mg]
Measurement 1	2.24	2.23
Measurement 2	2.16	2.14

Conclusions:

Using DSC it was determined that the test item starts to decompose right after melting. The onset temperature of the melting process was determined to be 72.5 °C and the decomposition temperature was determined to be 80.8 °C.

Executive summary:

A study similar to OECD 102 and EU Method A.2 was performed to determine the melting point of the test item using differential scanning calorimetry (DSC). The analysis was carried out in the DSC 1 STAR SYSTEM by Mettler Toledo. A SWISSI M20 crucible was used for the determination. The measuring range was between 25 °C to 300 °C at a heating rate of 2.0 °C/min. The analysis was performed as a duplicate determination. The decomposition of the test item releases an average energy of 818.5 J/g. The onset temperature of melting is an average 72.5 ° C. The decomposition temperature is at an average of 80.8 °C.

Description of key information

Using DSC it was determined that the test item starts to decompose right after melting. The onset temperature of the melting process was determined to be 72.5 °C and the decomposition temperature was determined to be 80.8 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

72.5 °C

Additional information

A study similar to OECD 102 and EU Method A.2 was performed to determine the melting point of the test item using differential scanning calorimetry (DSC). The analysis was carried out in the DSC 1 STAR SYSTEM by Mettler Toledo. A SWISSI M20 crucible was used for the determination. The measuring range was between 25 °C to 300 °C at a heating rate of 2.0 °C/min. The analysis was performed as a duplicate determination. The decomposition of the test item releases an average energy of 818.5 J/g. The onset temperature of melting is an average 72.5 ° C. The decomposition temperature is at an average of 80.8 °C.