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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
Study period:
from 2017-03-09 to 2017-04-03
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
TOXI-COOP Toxicological Reseach Center Zrt., H-8230 Balatonfüred, Arácsi u. 97-99, Hungary (+ 5 further Hungarian addresses)
Type of method:
capillary method
Key result
Atm. press.:
1 013 hPa
Decomposition:
yes
Decomp. temp.:
> 260 °C
Sublimation:
no

Preliminary test

In the preliminary test, no melting point was observed up to 375 °C.

Start temperature
°C
Heating rate
°C/min
End temperature
°C
Melting point  Observations
25 10 375  - The test item was hardened and moved towards
the upper part of the capillary, its color darkened.
25 5 300  - The test item was hardened and moved towards
the upper part of the capillary, its color became grey.
25 5 250  - No change was observed.
215 2 300  - The test item was hardened and moved towards
the upper part of the capillary, its color became dark grey.

Main Test

For the main study, the metal block was heated using 0.5 °C/min heating rate. The capillaries containing the test item were placed into the apparatus where the temperature was raised at 0.5 °C/min heating rate and after heating were examined visually. Melting point of the test item was not detected. Based on the visual observation in the change of color, the test item is regarded to decompose above 260 °C.

Start
temperature
°C
Heating rate
°C/min
End
temperature
°C
Melting point   Observations
245 0.5 260  - The color of the test item became grey.
245 0.5 270  - The color of the test item became grey.
245 0.5 275  - The color of the test item became dark grey.
245 0.5 280  - The test item was hardened and moved towards the upper part of the capillary, its color became greyish-brown.
245 0.5 285  - The test item was hardened and moved towards the upper part of the capillary, its color became dark brown.
245 0.5 290  - The test item was hardened and moved towards the upper part of the capillary, its color became dark brown.
300 0.5 375  - The test item was hardened and moved towards the upper part of the capillary, its color became dark brown.
Conclusions:
Melting point of the test item could not be detected. Based on the visual observation in the change of color, the test item is regarded to decompose above 260 °C.
Executive summary:

A study was performed according to OECD TG 102, Regulation (EC) No 440/2008 method A.1 and OPPTS 830.7200 in order to determine the melting point of the test item by using the capillary method. For the main test, the metal block was heated using 0.5 °C/min heating rate. The capillaries containing the test item were placed into the apparatus where the temperature was raised at 0.5 °C/min heating rate and after heating were examined visually. Melting point of the test item could not be detected. Between 260 and 275 °C the colour of the test item first became grey to dark grey and from 280 °C to 375 °C the test item was hardened and moved towards the upper part of the capillary, its color became dark brown. Based on the visual observation, the test item is regarded to decompose above 260 °C.

Description of key information

Melting point of the test item could not be detected. Based on the visual observation in the change of color, the test item is regarded to decompose above 260 °C.

Key value for chemical safety assessment

Additional information

A study was performed according to OECD TG 102, Regulation (EC) No 440/2008 method A.1 and OPPTS 830.7200 in order to determine the melting point of the test item by using the capillary method (reference 4.2-1). For the main test, the metal block was heated using 0.5 °C/min heating rate. The capillaries containing the test item were placed into the apparatus where the temperature was raised at 0.5 °C/min heating rate and after heating were examined visually. Melting point of the test item could not be detected. Between 260 and 275 °C the colour of the test item first became grey to dark grey and from 280 °C to 375 °C the test item was hardened and moved towards the upper part of the capillary, its color became dark brown. Based on the visual observation, the test item is regarded to decompose above 260 °C.

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