Registration Dossier

Physical & Chemical properties

Melting point / freezing point

Currently viewing:

Administrative data

Link to relevant study record(s)

Referenceopen allclose all

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Peer reviewed handbook.
Qualifier:
no guideline followed
GLP compliance:
no
Type of method:
other: The method is not stated in the handbook.
Specific details on test material used for the study:
Biphenyl-4,4’-diol / CAS 92-88-6
Key result
Melting / freezing pt.:
280 - 282 °C
Remarks on result:
other: Decomposition and sublimation not specified

The melting point of the test item, biphenyl-4,4'-diol is quoted to be 280-282 °C.

Conclusions:
The melting point of the test item, biphenyl-4,4'-diol is quoted to be 280-282°C.
Executive summary:

The melting point of the test item, biphenyl-4,4'-diol is quoted to be 280 -282°C in the Speciality Chemicals Source Book (3rd Edition).

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
15th June 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Modern study conducted under GLP to appropriate test guidelines.
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
yes
Type of method:
capillary method
Specific details on test material used for the study:
Biphenyl-4,4’-diol / CAS 92-88-6
Key result
Melting / freezing pt.:
283.2 °C
Decomposition:
yes
Remarks:
During the testing, a degradation process could be observed with discoloration of test item from white to orange/brown.
Remarks on result:
other: Decomposition temperature not specified in the report

Table 1:    Measured Melting Temperatures of the Reference Item Acetanilide

              Start temperature: 105 °C; Heating rate of 1 K/min

Begin of melting
[°C]

End of melting
[°C]

Literature* melting point [°C]

Deviation from literature melting point [°C]

114.9

115.6

115

0.6

         *)   IUPAC ‘Physicochemical Measurements: Catalogue of Reference Materials from National Laboratories’

 

Table 2:    Measured Melting Temperatures of4,4-Biphenol

              Start temperature: 274 °C; Heating rate of 1 K/min

Replicate No.

Begin of melting
[°C]

Begin of melting
[K]

End of melting
[°C]

End of melting
[K]

1

281.2

554.35

283.1

556.25

2

281.2

554.35

283.2

556.35

3

281.2

554.35

283.2

556.35

Mean

281.2

554.4

283.2

556.3

Conclusions:
The melting range of the test item 4,4-Biphenol was determined to be 554.4 K (281.2 °C) to 556.3 K (283.2 °C). The mean melting point was determined to be 283.2 °C. During the testing, a degradation process could be observed with discolouration of the test item from white to orange / brown.
Executive summary:

The melting point range of the test substance was determined using Council Regulation (EC) No. 440/2008 Method A.1 (2008). The melting range of the test item 4,4-Biphenol was determined to be 554.4 K (281.2 °C) to 556.3 K (283.2 °C). The mean melting point was determined to be 283.2 °C. During the testing, a degradation process could be observed with discolouration of the test item from white to orange / brown.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Peer reviewed handbook.
Qualifier:
no guideline followed
GLP compliance:
no
Type of method:
other: Method is not stated in handbook.
Specific details on test material used for the study:
Biphenyl-4,4’-diol / CAS 92-88-6
Key result
Melting / freezing pt.:
280.7 °C
Remarks on result:
other: Decomposition and sublimation not specified

There is no further information on the results to report.

Conclusions:
The freezing point of the test item, 4,4 -Biphenol is stated to be 280.7°C in the Yaws' Handbook.
Executive summary:

The freezing point of the test item, 4,4 -Biphenol is stated to be 280.7°C in the Yaws' Handbook.

Description of key information

The melting point range of the test substance was determined using EU Method A.1. The melting range of the test item 4,4-Biphenol was determined to be 554.4 K (281.2 °C) to 556.3 K (283.2 °C). The mean melting point was determined to be 283.2 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
283.2 °C

Additional information