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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

Study period:

1999-01-07 to 1999-03-02

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

BS 4633: Method for the determination of crystallizing point

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

BS 4633: Method for the determination of crystallizing point

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

method to determine freezing temperature

Key result

Melting / freezing pt.:

< -20 °C

Atm. press.:

1 013 hPa

Key result

Melting / freezing pt.:

< 253 K

Atm. press.:

1 013 hPa

The results of the cooling data are shown in Table 1 and Table 2 below.

Table 1: Determination 1

Time (s)	Temperature (K)	Time (s)	Temperature (K)
0	293	1050	267
30	292	1080	266
60	291	1110	266
90	290	1140	265
120	289	1170	265
150	288	1200	264
180	287	1230	264
210	286	1260	263
240	285	1290	263
270	284	1320	262
300	283	1350	262
330	282	1380	261
360	281	1410	261
390	280	1440	260
420	280	1470	260
450	279	1500	259
480	278	1530	259
510	277	1560	258
540	277	1590	258
570	276	1620	258
600	276	1650	257
630	275	1680	257
660	274	1710	257
690	274	1740	256
720	273	1770	256
750	273	1800	256
780	272	1830	255
810	272	1860	255
840	271	1890	255
870	271	1920	255
900	270	1950	254
930	270	1980	254
960	269	2010	254
990	269	2040	254
1020	268

 

Observations: the test substance became slightly cloudy on cooling

Result: freezing temperature <253 K

Table 2: Determination 2

Time (s)	Temperature (K)	Time (s)	Temperature (K)
0	293	1080	264
30	292	1110	264
60	291	1140	263
90	290	1170	263
120	289	1200	262
150	288	1230	262
180	287	1260	261
210	286	1290	261
240	285	1320	261
270	284	1350	260
300	283	1380	260
330	282	1410	260
360	281	1440	259
390	280	1470	259
420	279	1500	259
450	278	1530	259
480	278	1560	258
510	277	1590	258
540	276	1620	258
570	275	1650	257
600	274	1680	257
630	274	1710	257
660	273	1740	256
690	272	1770	256
720	271	1800	256
750	270	1830	256
780	269	1860	255
810	269	2890	255
840	268	1920	255
870	268	1950	255
900	267	1980	255
930	267	2010	254
960	266	2040	254
990	266	2070	254
1020	265	2100	254
1050	265	2130	253

 

Observations: the test substance became slightly cloudy on cooling

Result: freezing temperature <253 K

 

Conclusions:

A freezing temperature value of <-20°C (<253 K) at 1013 hPa was determined for the substance using a relevant test method and in compliance with GLP. The result is considered to be reliable.

Description of key information

Freezing temperature: <-20°C (<253 K) at 1013 hPa (BS 4633)

Additional information

A freezing temperature value of <-20°C (<253 K) at 1013 hPa was determined for the substance using the Method for the Determination of Crystallizing Point in accordance with BS 4633 and in compliance with GLP. The result is considered to be reliable.