Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
thermal stability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
07 December 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report date:
2018

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Determination of thermal stability by Differential Scanning Calorimetry (DSC).
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
2,2'-azobis[2-methylpropionamidine] dihydrochloride
EC Number:
221-070-0
EC Name:
2,2'-azobis[2-methylpropionamidine] dihydrochloride
Cas Number:
2997-92-4
Molecular formula:
C8H18N6.2ClH
IUPAC Name:
2,2'-diazene-1,2-diylbis(2-methylpropanimidamide) dihydrochloride
Test material form:
solid

Results and discussion

For thermal stability study

Test substance thermally stable:
no
Operating temperature
Key result
Operating temp.:
164.5 °C
Remarks on result:
other: exothermal event

Any other information on results incl. tables

RESULTS

- Safety pre-test 1: When heated on a magnesia groove over a Bunsen burner, the test substance fizzled with white smoke, melted to a yellow-brown liquid and burned with a yellow flame. When the test item was beaten with a hammer on the anvil, the test substance was compacted, no reaction was observed.

- Safety pre-test 2: The outside gold seal was grey-black discoloured and slightly bulged after reaching a temperature of 520 °C. After cooling, weight was recorded as 621.42 mg. When the crucible was opened, the test substance was charred, the gold seal was grey-black discoloured and

deformed.

- After calibration with indium and zinc the measurement of indium yielded the values shown in Figure 1 and Table 3.3-a (attached). The measurement of indium after calibration met the validity criteria.

- The DSC curve for the test item is shown in Figure 2 (attached).

- The DSC values for the test item are shown in Table 3.4-a (attached).

- Mass of the test item: 1.04 mg

- Mass of crucible before measurement: 616.86 mg,

- Mass of crucible after measurement: 616.13 mg.

- Observations: After the test the crucible was visually unchanged, the crucible was opened and the gold seal and the test item were discoloured black/grey.

Applicant's summary and conclusion

Conclusions:
During the DSC run an exothermal event caused by decomposition was observed at the temperature of 164.50 °C (onset) and this was integrated to derive the related energy (in J/g). The related energy of the observed exothermal event was 597.41 J/g.
Executive summary:

Thermal stability of the test item was investigated by conducting a DSC (differential scanning calorimetry) screening test from 0 °C to 520 °C.

 

During the DSC run an exothermal event caused by decomposition was observed at the temperature of 164.50 °C (onset) and this was integrated to derive the related energy (in J/g). The related energy of the observed exothermal event was 597.41 J/g.