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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP compliant, guideline study, available as an unpublished report, reliable without restrictions
Qualifier:
according to guideline
Guideline:
other: OECD Guideline 102 (Melting point / Melting Range)
Qualifier:
according to guideline
Guideline:
other: EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
yes (incl. QA statement)
Type of method:
other: capillary method
Atm. press.:
101.3 kPa
Decomposition:
yes
Decomp. temp.:
250 °C
Remarks on result:
other: Atmospheric pressure not stated, so assumed standard

The mean of at least two measurements, which are in the range of the estimated accuracy, is reported as the melting temperature.

If the difference between the temperature at the beginning and at the final stage of melting is within the limits of the accuracy of the method, the temperature at the final stage of melting is taken as the melting temperature, otherwise the two temperatures are reported.

If the substance decomposes or sublimes before the melting temperature is reached, the temperature at which the effect is observed shall be reported.

 

Apparatus : Melting temperature devices with liquid bath and a calibrated, digital thermocouple system.

 

 Run Number  1  2
 Mass of Sample Used (g)  0.0361  0.0346
 Initial Melting Temperature (°C)  N/A  N/A
 Final Melting Temperature (°C)  N/A  N/A

Result : Not determined due to decomposition.

Comments

The sample discoloured to brown at 190°C then darkened to black at 240°C. The testing

was terminated at 250°C due to suspected decomposition.

Conclusions:
The sample discoloured to brown at 190°C then darkened to black at 240°C. The testing was terminated at 250°C due to suspected decomposition.
Executive summary:

Melting point was measured in a GLP-compliant, guideline study that is considered reliable without restrictions.

Description of key information

The melting points of substances in the category Rosin, hydrogenated rosin and their salts range from 31 to >300°C.

The boiling point of Resin acids and Rosin acids, potassium salts was not determined since the sample decomposes before melting at ca 250°C. The test was terminated at this point


Key value for chemical safety assessment

Additional information