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Physical & Chemical properties

Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
This study was conducted between 01 June 2017 and 21 October 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study is considered to be a reliability 1 as it has been conducted according to OECD TG 103 and in compliance with GLP.
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Version / remarks:
27 July 1995
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Version / remarks:
EC No. 440/2008 of 30 May 2008
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Information as provided by the Sponsor.
Identification: 1,3-Benzenedimethanamine, reaction products with glycidyl tolyl ether
Appearance/Physical state: clear, colorless, viscous liquid
Batch: WA 1508
Purity: 100% UVCB
Expiry date: 01 January 2021
Storage conditions: room temperature, in the dark
Key result
Atm. press.:
102.4 kPa
Decomposition:
yes
Decomp. temp.:
ca. 180 °C
Key result
Atm. press.:
102.4 kPa
Decomposition:
yes
Decomp. temp.:
ca. 453 K

Thermographic Data

Thermal Event

Interpretation

Temperature

Determination 1

Determination 2

ºC

K

ºC

K

Approximate onset of exotherm.

Approximate onset of decomposition.

126.93

400

129.71

403

Extrapolated onset of exotherm.

Extrapolated onset of decomposition.

140.34

413

143.39

417

Discussion

From comparison of the thermogram profiles obtained from samples analysed using pre‑perforated crucible lids (which allow self-pressurisation up to the boiling temperature) and those using manually pierced crucible lids (i.e. an open system), it is possible to evaluate if an observed endotherm originates from a true boiling temperature for the test item. 

 

For determinations 1 and 2, performed using the pre-perforated crucible lids, no significant endotherms were observed prior to obvious ongoing decomposition of the test item. For the determinations performed in a manually pierced crucible, determinations 3 to 5 inclusive, a minor, broad endotherm was observed from approximately 60 °C. However, as this thermal event was suppressed by the pre-perforated crucible lids, this endotherm can be confidently attributed to evaporation only, as opposed to a true boiling temperature for any individual component present in the test item. The influence of this endotherm on the overall thermogram profile was the reason that determinations 1 and 2 only were considered for quantification of the test item decomposition. Decomposition was further supported by the test item residues remaining on completion of all determinations.

 

Due to the low initial rate of enthalpy change during decomposition, the onset temperature could only be approximated. Due to the variance observed, a limit value has been reported based on the lowest observed onset temperature.

 

The use of manually pierced crucibles (an open system) also provided an opportunity to assess the stability of the test item in air and in an inert atmosphere (nitrogen). Decomposition was observedboth in air and under a nitrogen atmosphere, indicating the process was most likely thermal and not oxidative.

Conclusions:
The test item was determined to decompose from approximately 127 °C (400 K) at 100.7 to 101.6 kPa. Decomposition was observed both in air and under a nitrogen atmosphere. Therefore, due to thermal decomposition, the boiling point cannot be determined for this substance.
Executive summary:

The general physico-chemical properties of 1,3-Benzenedimethanamine, reaction products with glycidyl tolyl ether have been determined. 

Boiling Point. The test item was determined to decompose from approximately 127 °C (400 K) at 100.7 to 101.6 kPa. Decomposition was observed both in air and under a nitrogen atmosphere. Therefore, due to thermal decomposition, the boiling point cannot be determined for this substance.Testing was performed by differential scanning calorimetry, using a procedure designed to be compatible with Method A.2 Boiling Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 103 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. 

Description of key information

The test item was determined to decompose from approximately 127 °C (400 K) at 100.7 to 101.6 kPa.

Key value for chemical safety assessment

Additional information