Registration Dossier
Registration Dossier
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EC number: 282-803-8 | CAS number: 84434-05-9
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 10 Dec 2018 to 16 Jan 2019
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- March 04, 2016
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- July 27, 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Version / remarks:
- March 1998
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Specific details on test material used for the study:
- Appearance: Yellow powder
Purity / composition: 98.25%, assumed 100% for testing
Test item storage: At room temperature protected from light, desiccated - Key result
- Melting / freezing pt.:
- 217.5 °C
- Atm. press.:
- 101 325 Pa
- Conclusions:
- The melting temperature of CMTX 2-carboxymethyloxy-thioxanthone was determined by DSC.
The melting temperature of the test item was 217.5°C (490.7K). - Executive summary:
In this guideline (OECD 102) study performed with GLP certification, the test material (EC 282-803-8) was determined to have a melting point of 217.5 °C.
Reference
Preliminary Test
The TGA curve of the test item is shown in Figure 1. Starting at 350°C, the weight of the sample decreased significantly. At 394°C, the sample weight had decreased by 25%.
After the experiment, a black molten residue remained in the sample container (original colour: yellow). The change of the colour indicated reaction and/or decomposition of the test item.
Main Study
The DSC curve obtained with Experiment 1 is shown in Figure 2. An endothermic effect was observed between 175°C and 250°C followed by an exothermic effect starting at 350°C. The extrapolated onset temperature of the first effect was 217.605°C. The endothermic effect was most likely obtained due to melting of the test item. The exothermic effect was probably obtained due to reaction and/or decomposition of the test item.
The melting temperature was determined as the mean melting temperature of Experiment 1 (217.605°C) and Experiment 2 (217.404°C).
Description of key information
Study conducted to recognised testing guidelines with GLP certification.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 217.5 °C
Additional information
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