2,5-bis(1,1,3,3-tetramethylbutyl)hydroquinone

Melting point / freezing point

Link to relevant study record(s)

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:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Decomposition:

yes

Remarks:

Melting began during decomposition (indicated by a darkening in colour), starting at 132 °C and ending at 133 °C.

Decomp. temp.:

ca. 132 °C

Remarks on result:

other: The test item changed from brown, to dark brown, to black over the temperature range 132 °C to 320 °C.

Results of pre test:

Observations	Temperature
Test item in aluminium block	23.8 °C
Melting began under decomposition, colour was darker	132 °C
Melting end under decomposition, colour was darker	133 °C
After melting, colour brown	137 °C
Colour a bit darker	240 °C
Colour strong darker	319 °C
Colour dark brown nearly to black	320 °C
Heating up to 390 °C as the test item was black. The test item decomposed.

 

In the pre-test, the test item showed signs of decomposition during melting process indicated by colour change.

The determination of melting and boiling point of the test item AF-317 could not be determined because of decomposition during melting process.

Description of key information

Melting began during decomposition (indicated by a darkening in colour), starting at 132 °C and ending at 133 °C (OECD 102, pre-test, capillary tube).