Biphenyl-4,4'-diol

Melting point / freezing point

Link to relevant study record(s)

Reference

Reference 1

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).

Reference 2

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

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Qualifier:

according to guideline

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.

Reference 3

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