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Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods

Data source

Reference
Reference Type:
other company data
Title:
Unnamed
Year:
2019
Report date:
2019

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Thermogravimetric analysis (TGA) was used to determine thermal characteristics of the test material. Differenital scanning calorimetry was applied to determine transition activity. The study was based on the crystalline sample.
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
other: Differential scanning calorimetry and Thermogravimetric analysis

Test material

Constituent 1
Chemical structure
Reference substance name:
Ammonium toluene-4-sulphonate
EC Number:
223-927-4
EC Name:
Ammonium toluene-4-sulphonate
Cas Number:
4124-42-9
Molecular formula:
C7H8O3S.H3N
IUPAC Name:
ammonium 4-methylbenzenesulfonate

Results and discussion

Melting / freezing point
Key result
Melting / freezing pt.:
145 °C
Atm. press.:
101.325 kPa
Decomposition:
yes
Decomp. temp.:
>= 296 °C

Any other information on results incl. tables

Table 1: Results of the TGA

Onset (°C) Excluding Water of Hydration

Thermal Events

%W loss

%W Residue

Derivative Peak (°C)

296

<140

0.3

2.8

309

93.2

354

3.7

 

Table 2: Results of the DSC analysis

Event

Onset (°C)

Peak (°C)

ΔH (J/g)

Endotherm

144.8

145.4

5.18

Endotherm

164.7

165.6

0.74

Applicant's summary and conclusion

Conclusions:
Under the conditions of the test, the major endotherm at an onset of 145°C is indicative of the substance melting as demonstrated by the differential scanning calorimetry analysis. Further thermal events indicated by the Thermogravimetric analysis indicates decomposition of the test material under the conditions of the test.