Hydrogen peroxide-urea

Boiling point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

boiling point

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is a solid which decomposes before boiling

Reference 2

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study without detailed documentation

Reason / purpose for cross-reference:

reference to same study

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

GLP compliance:

no

Type of method:

differential scanning calorimetry

Key result

Decomposition:

yes

Decomp. temp.:

ca. 80.8 °C

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 the decomposition temperature of the test item was determined to be 80.8 °C.

Executive summary:

A study similar to OECD 102 and EU Method A.1 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

Not applicable. The test item decomposes before boiling.

Additional information

In accordance with column 2 of REACH Annex VII, the boiling point study does not need to be conducted as the substance decompose before boiling.

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. As the test item decomposes right after melting, no boiling point could be determined. therefore, no test on boiling point is needed.