Registration Dossier
Registration Dossier
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EC number: 268-071-2 | CAS number: 68002-58-4 This substance is identified by SDA Substance Name: C14-C18 dialkyl dimethyl ammonium methyl sulfate and SDA Reporting Number: 17-049-00.
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:
- 2016-09-13 to 2016-09-22
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- adopted 27 July, 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 30 May, 2008
- Deviations:
- no
- GLP compliance:
- no
- Other quality assurance:
- ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- 50 °C
- Decomposition:
- no
- Sublimation:
- no
- Remarks on result:
- other: first detectable melting
- Remarks:
- definite temperature not unambiguously determinable by DSC method
- Key result
- Melting / freezing pt.:
- 136 °C
- Decomposition:
- no
- Sublimation:
- no
- Remarks on result:
- other: second detectable melting
- Remarks:
- definite temperature not unambiguously determinable by DSC method
- Conclusions:
- No definite melting temperature of Di-C14-18 alkyldimethyl ammonium methosulfate was detected by DSC method. Two endothermal peaks were determined, a major peak with maximum at 60 °C (extrapolated onset temperature: 50°C) and a minor peak with maximum at 144°C (extrapolated onset temperature: 136°C). After 240°C the sample was completely melted.
- Executive summary:
In the present test according to OECD test guideline 102 (adopted 27 July, 1995) and EU test method A.1, Council Regulation (EC) No 440/2008 (30 May, 2008), the melting point of Di-C14 -18 alkyldimethyl ammonium methosulfate was measured with differential scanning calorimetry.
The difference in the temperatures of the test item and a reference substance was recorded and applied a calibration function converted to a heat flow signal. When the sample underwent a transition involving a change in enthalpy (endothermic on melting or boiling), that change was indicated by a departure from the base line of the heat flow record.
A definite melting temperature of Di-C14-18 alkyldimethyl ammonium methosulfate cannot be unambiguously detected by DSC method. Instead, two endothermal peaks were determined, a major peak with maximum at 60°C (extrapolated onset temperature: 50°C) and a minor peak with maximum at 144°C (extrapolated onset temperature: 136°C). After 240°C the sample was completely melted.
Reference
The first DSC measurement was performed until 240 °C. Two endothermal peaks were determined, a major peak with maximum at 60 °C (extrapolated onset temperature: 50 °C) and a minor peak with maximum at 144 °C (extrapolated onset temperature: 136 °C). After 240 °C the sample was completely melted. A second test was performed with the same parameters but only until 70 °C. The sample shows no difference in appearance (no visible melting). Eventually 2 melting temperatures can be detected due to mixture.
The first endothermal peak exhibits an untypical shape with several secondary, small peak maxima at ca. 25, 40 and 46 °C (maybe indicating thermal conversions).
Description of key information
50°C to 136°C (OECD TG 102/ EU method A.1; non-GLP, RL1)
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 50 °C
Additional information
In the present test according to OECD test guideline 102 (adopted 27 July, 1995) and EU test method A.1, Council Regulation (EC) No 440/2008 (30 May, 2008), the melting point of Di-C14 -18 alkyldimethyl ammonium methosulfate was measured with differential scanning calorimetry.
The difference in the temperatures of the test item and a reference substance was recorded and applied a calibration function converted to a heat flow signal. When the sample underwent a transition involving a change in enthalpy (endothermic on melting or boiling), that change was indicated by a departure from the base line of the heat flow record.
A definite melting temperature of Di-C14-18 alkyldimethyl ammonium methosulfate cannot be unambiguously detected by DSC method. Instead, two endothermal peaks were determined, a major peak with maximum at 60°C (extrapolated onset temperature: 50°C) and a minor peak with maximum at 144°C (extrapolated onset temperature: 136°C). After 240°C the sample was completely melted.
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