Registration Dossier

Administrative data

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Experimental starting date: 17 October 2017. Experimental completion date:17 January 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

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

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Details on test material:
Identification: 1-(methylamino)-4-[(3-methylphenyl)amino] anthraquinone
Physical state/Appearance: dark red powder
Batch: 702W01
Purity: 99.4%
Expiry Date: 08 February 2020
Storage Conditions: room temperature in the dark
Intended use/Application: industrial chemical

Results and discussion

Melting / freezing point
Key result
Melting / freezing pt.:
148.2 °C
Atm. press.:
>= 101.1 - <= 101.8 kPa
Decomposition:
yes
Decomp. temp.:
ca. 290 °C

Any other information on results incl. tables

Thermographic Data (Melting Temperature)

Thermal Event

Interpretation

Temperature (°C)

Determination 2

Determination 4

Sharp endotherm

Onset of melting

148.27

148.15

Mean melting temperature:    148.2 ± 0.5 °C (421.4 ± 0.5 K)

Thermographic Data (Boiling Temperature)

Thermal Event

Interpretation

Temperature (°C)

Determination 1
(Air)

Determination 3 (Nitrogen)

Broad exotherm

Onset of decomposition

~290C

~350

Onset of decomposition:        From approximately 290 °C (563 K)

Atmospheric pressure:           Determination 1:  101.1 kPa
                                               Determination 3:  101.8 kPa

Furthermore, as determinations 1 and 3 indicated a distinct rise in the baseline which was consistent with a browning of the test item, the test item was considered to have decomposed above approximately 290 °C (563 K).

Discussion

Determinations 1 and 3 indicated a distinct rise in the baseline, consistent with a browning of the test item; thus the test item was considered to have decomposed above approximately 290 °C (563 K). As a result of the low rate of enthalpy change during decomposition, the onset temperature of decomposition could only be approximated.

Similar thermographic profiles were obtained using air and nitrogen atmospheres; this indicated that the observed decomposition was probably thermal and not oxidative.

Applicant's summary and conclusion

Conclusions:
The test item has been determined to melt at 148.2 ± 0.5 °C (421.4 ± 0.5 K) and then decompose from approximately 290 °C (563 K) at 101.1 to 101.8 kPa. As the test item decomposed no boiling temperature could be determined.