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Physical & Chemical properties

Melting point / freezing point

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Reference
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 generally accepted scientific standards and described in sufficient detail
Justification for type of information:
Data is from experimental study report
Qualifier:
according to
Guideline:
other: Refer below principle
Principles of method if other than guideline:
The freezing point of a pure sample was determined by making measurements of the temperature as a function of time while the sample was submerged in a constant temperature bath at a temperature below that of the expected freezing point of the sample. The data (Temperature vs. time) was plotted; this plot is known as a cooling curve. The freezing point of test chemical was 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.:
-8.15 °C
Atm. press.:
965.7 hPa
Remarks on result:
other: No other details available

Method:

 Method Details      Observations
 Method Method according to Cooling Curve  - 
Principle of Freezing point test   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.  -
 Quantity of test item used  g  1 ml
 Type of cooling bath used
  • Cold Water
  • Crushed Ice
  • Crushed Ice-Salt
  • Dry Ice
  • Other (specify) 
Crushed Ice Salt 
Type and model no. of temperature sensor used
  • Glass thermometer
  • Thermocouple
  • Thermistor Other (specify)
Glass Thermistor  
 Atmospheric pressure  hPa  965.7 hPa
 Freezing point °C  °C  -8.15 °C
Conclusions:
The mean Freezing point of test chemical was determined with cooling curve method and it was observed to be -8.15 °C at 965.7 hPa.
Executive summary:

The Freezing point determination of test chemical was performed using crushed ice and salt . The determination was done on the basis of cooling curve (time vs temperature) obtained when the test chemical was placed in the cooling bath. The freezing point was observed to be -8.15°C at 965.7 hPa.

Description of key information

The Freezing point determination of test chemical was performed using crushed ice and salt . The determination was done on the basis of cooling curve (time vs temperature) obtained when the test chemical was placed in the cooling bath. The freezing point was observed to be -8.15°C at 965.7 hPa.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-8.15 °C

Additional information

The Freezing point determination of test chemical was performed using crushed ice and salt . The determination was done on the basis of cooling curve (time vs temperature) obtained when the test chemical was placed in the cooling bath. The freezing point was observed to be -8.15°C at 965.7 hPa.