Registration Dossier
Registration Dossier
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EC number: 203-212-3 | CAS number: 104-54-1
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
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Justification for type of information:
- Experimental test result performed using standard test guidelines
- Qualifier:
- according to guideline
- Guideline:
- other: as mention below
- Principles of method if other than guideline:
- The freezing point of a pure sample is determined by making measurements of the temperature as a function of time while the sample is submerged in a constant temperature bath at a temperature below that of the expected freezing point of the sample. The data (Temperature vs. time) is plotted; this plot is known as a cooling curve. The freezing point is the value of temperature in the flat portion of the curve.
- GLP compliance:
- no
- Type of method:
- other: Method according to Cooling Curve
- Key result
- Melting / freezing pt.:
- -9.79 °C
- Atm. press.:
- 947.9 hPa
- Decomposition:
- no
- Sublimation:
- no
- Cold Water
- Crushed Ice
- Crushed Ice-Salt
- Dry Ice
- Other (specify)
- Glass thermometer
- Thermocouple
- Thermistor
- Other (specify)
- Conclusions:
- The Mean Freezing point of test chemical by cooling curve method was determined to be -9.79 °C at 974.9 hPa.
- Executive summary:
The Freezing point determination of test chemical was done using crushed ice and salt. The determination was done on the basis of cooling curve (time vs temperature) obtained when the test item was placed in the cooling bath. The freezing point was observed to be -9.79 °C at 974.9 hPa.
Reference
Observation Table & Result :
| Method Details | Observations | |
| Method | Freezing Temperature Method | |
| Principle of method | The freezing point of a pure sample is the temperature at which transition from liquid to solid state takes place at atmospheric pressure. |
|
Quantity of test item used |
g |
1 ml |
Type of cooling bath used |
Crushed Ice- Salt |
|
Type and model no. of temperature sensor used |
Glass thermometer |
|
Atmospheric pressure |
hPa |
974.9 hPa |
Freezing point °C |
°C |
-9.79 °C |
Description of key information
The Mean Freezing point of test chemical by cooling curve method was determined to be -9.79 °C at 974.9 hPa.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -9.79 °C
Additional information
The Freezing point determination of test chemical was done using crushed ice and salt. The determination was done on the basis of cooling curve (time vs temperature) obtained when the test item was placed in the cooling bath. The freezing point was observed to be -9.79 °C at 974.9 hPa.
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