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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other: GLP-compliant, guideline study, available as an unpublished report, reliable without restrictions.
Justification for type of information:
A discussion and report on the read across strategy is given as an attachment in IUCLID Section 13.
Reason / purpose for cross-reference:
read-across: supporting information
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
method according to Siwoloboff
Remarks:
plus Differential Scanning Calorimetry
Key result
Decomposition:
yes
Decomp. temp.:
ca. 171 °C

Volatile components were lost between 110 and 126 °C.

Conclusions:
Test was terminated at 171°C and no boiling point was observed under the test conditions.

At this temperature discoloration of the test sample was observed. This phenomenon is not the consequence of mass decomposition of the substance but occurs when the resin is not correctly stored and when heating the substance in a non-inert atmosphere (due to the formation of some chromophores).
Any heating to elevated temperatures should occur under inert gas conditions to prevent darkening of the product.
Executive summary:

The determination of the boiling temperature was carried out using differential scanning calorimetry and a procedure based on the liquid bath method, designed to be compatible OECD guideline 103.

During visual observation of the test item during heating the color was shown to darken throughout heating, with the first note of a change of color at 171 °C. There is however no corresponding peak in the DSC traces, only a gradual increase in the baseline. The endotherm temperature registred was approximately 118 °C, and this has been attributed to the loss of water from the sample. The test was terminated at 171°C and no boiling point was observed under the test conditions. At this temperature discoloration of the test sample was observed. This phenomenon is not the consequence of mass decomposition of the substance but occurs when the resin is not correctly stored and when heating the substance in a non-inert atmosphere (due to the formation of some chromophores). Any heating to elevated temperatures should occur under inert gas conditions to prevent darkening of the product.

The test was performed in compliance with GLP standards, and with guidelines studies, therefore the results are reliable.

Description of key information

Substances in the category Rosin, hydrogenated rosin and their salts have a boiling point >360°C.

There is no data available for Resin acids and rosin acids, reaction products with formaldehyde, sodium salts. However, data available from a structural analogue Resin acids and rosin acids, reaction products with formaldehyde, potassium salts is used as read across.


Test was terminated at 171°C and no boiling point was observed under the test conditions.

At this temperature discoloration of the test sample was observed. This phenomenon is not the consequence of mass decomposition of the substance but occurs when the resin is not correctly stored and when heating the substance in a non-inert atmosphere (due to the formation of some chromophores).

Any heating to elevated temperatures should occur under inert gas conditions to prevent darkening of the product.



Key value for chemical safety assessment

Additional information

There is no data available for Resin acids and rosin acids, reaction products with formaldehyde, sodium salts. However, data available from a structural analogue Resin acids and rosin acids, reaction products with formaldehyde, potassium salts is used as read across.

A GLP-compliant study, conducted according to OECD Guideline 103, was provided for Resin acids and Rosin acids, reaction products with formaldehyde, potassium salt (Harlan Laboratories Ltd., 2012a)