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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2012-06-13 to 2012-07-31
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7220 (Boiling Point / Boiling Range)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Atm. press.:
100.6 kPa
Decomposition:
yes
Decomp. temp.:
>= 295 °C

Differential Scanning Calorimetry:

The results from the thermographic data are showin in Tables 1 and 2.

Table 1: Thermographic data- Determination 1

thermal event

Interpretation

temperature

°C

K

Endotherm

Decomposition

From 294.17

from 567

 

Atmospheric pressure: 100.6 kPa

Table 2: Thermographic data- Determination 2

thermal event

Interpretation

temperature

°C

K

Endotherm

Decomposition

From 296.00

from 569

 

Atmospheric pressure: 100.6 kPa

Mean onset of decomposition: 295°C (568 K)

Visual Assessment

The visual observations of the test item and the associated temperatures are shown in the following table.

Reading Number  Temperature (°C)  Observations
 1  20.0  Pale orange non viscous liquid
 2  116.0  Pale orange non viscous liquid
 3  200.0  Pale orange non viscous liquid
 4  249.0  Pale orange non viscous liquid
 5  298.0  Pale orange liquid rising up sides of test tube
 6  314.0  Small bubbles appear in pale orange liquid
 7  326.0  Increasing amount of amber colored liquid on test tube sides
 8  333.0  Amber colored liquid with amber colored residue on test tube walls
 9  339.0  Bubbles appear in amber colored liquid
 10  350.0  Bubbles appear in amber colored liquid
 11  355.0  Dark amber colored liquid with amber colored residue on test tube walls. Reduction in volume of liquid
 12  357.0  Bubbles appear in dark amber colored liquid
 13  360.0  Bubbles appear in amber colored liquid with amber colored residue on test tube walls

During the visual assessment the test item was observed to darken in color from 326°C which supports the conclusion that the test item decomposed from approximately 295°C. As a result of the low rate of enthalpy change during decomposition, the onset temperature can only be approximated.

Conclusions:
The test item has been determined to decompose from approximately 295°C (568 K) at approximately 100.6 kPa. As the test item decomposed, no value for boiling temperature could be determined.
Executive summary:

Boiling Temperature. The test item decomposed from approximately 295°C (568 K) at approximately 100.6 kPa by differential scanning calorimetry using a method designed to be compatible with Method A2 Boiling Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008, Method 103 of the DECD Guidelines for Testing of Chemicals, 27 July 1995 and Method 830.7220 of the DPPTS Guidelines. As the test item decomposed, no value for boiling temperature could be determined.

Description of key information

Boiling point: decomposition from about 295°C (OECD 103)

Key value for chemical safety assessment

Additional information

The boiling temperature of the substance was determined with the use of a differential scanning calorimetry (DSC) method in accordance with OECD Test Guideline 103 and in compliance with GLP. The substance was observed to undergo thermal decomposition from about 295°C at 100.6 kPa. The result is considered to be reliable.