Triethyl phosphonoacetate

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:

From 16 December 2011 to 3 September 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Study conducted in compliance with international and OECD standard guidelines under GLP conditions. The study report was well documented with all mandatory information included.

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

2011-08-31

Type of method:

method to determine freezing temperature

Melting / freezing pt.:

< -20 °C

Remarks on result:

other: the test item became slightly viscous during cooling

Results of determination 1 :

time of cooling (s)	temperature of cooling (°K)	time of cooling (s)	temperature of cooling (°K)	time of cooling (s)	temperature of cooling (°K)
0	295	510	276	1020	266
30	293	540	275	1050	266
60	292	570	275	1080	265
90	290	600	274	1110	265
120	289	630	274	1140	264
150	287	660	273	1170	264
180	286	690	272	1200	263
210	285	720	272	1230	263
240	2853	750	271	1260	262
270	282	780	271	1290	262
300	281	810	270	1320	261
330	281	840	269	1350	261
360	280	870	269	1380	260
390	279	900	268	1410	260
420	278	930	268	1440	259
450	277	960	267	1470	259
480	277	990	267	1500	259

 

time of cooling (s)	temperature of cooling (°K)	time of cooling (s)	temperature of cooling (°K)
1530	258	2040	254
1560	258	2070	253
1590	258	2100	253
1620	257	2130	253
1650	257	2160	253
1680	257	2190	253
1710	256	2220	253
1740	256	2250	253
1770	256	2280	252
1800	256
1830	255
1860	255
1890	255
1920	255
1950	254
1980	254
2010	254

 The test item became slightly viscous during cooling. Freezing temperature is less than 20°C (<253°K)

 

Results of determination 2:

time of cooling (s)	temperature of cooling (°K)	time of cooling (s)	temperature of cooling (°K)	time of cooling (s)	temperature of cooling (°K)
0	294	510	270	1020	258
30	293	540	269	1050	257
60	291	570	268	1080	257
90	289	600	267	1110	256
120	287	630	266	1140	255
150	285	660	266	1170	255
180	284	690	265	1200	254
210	282	720	264	1230	254
240	281	750	263	1260	254
270	279	780	263	1290	254
300	278	810	262	1320	253
330	277	840	261	1350	253
360	276	870	261	1380	253
390	275	900	260	1410	253
420	273	930	260	1440	252
450	272	960	259
480	271	990	258

The test item became slightly viscous during cooling. Freezing temperature is less than - 20°C (<253°K).

Graphs of temperature (K) versus time (seconds) for determination 1 and 2 are shown in the attached illustration

Conclusions:

The freezing temperature of the test item has been determined to be less than -20°C (<253K).

Executive summary:

The determination of the freezing point was carried out according to the Method A1 Melting/Freezing Temperature of Commission Regulation (EC) N°440/2008 of 30 May 2008, Method 102 of the OECD Guidelines for Testing of Chemicals, 27 July 1995 and according to GLP. No deviation from the guideline was observed during the test.

An aliquot (approximately 15 mL) of test item was placed into a test tube containing a thermometer. A wire loop with which the sample could be agitated was placed inside the tube to ensure sample homogeneity during cooling. The test tube was surrounded by a glass jacket and then placed into a large beaker containing a dry ice/acetone mixture. The temperature and observations of the test item were recorded every 30 seconds. The dry ice/acetone bath was maintained until the sample temperature had reached at least -20°C or until the test item solidified.

The test item became slightly viscous during cooling but did not solidify during both determinations down to -20°C. In accordance with Column 2 of the Annex VII of REACH, Information requirement section 7.2, this study does not need to be conducted below a lower limit of -20°C. So the freezing temperature of the test item has been determined to be less than -20°C (<253K).

Description of key information

Experimental value of freezing point : < -20°C (<253K).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

-20 °C

Additional information

The determination of the freezing point was carried out according to the Method A1 Melting/Freezing Temperature of Commission Regulation (EC) N°440/2008 of 30 May 2008, Method 102 of the OECD Guidelines for Testing of Chemicals, 27 July 1995 and according to GLP.

The test item became slightly viscous during cooling but didn't solidify during determinations down to -20°C. In accordance with Column 2 of the Annex VII of REACH, Information requirement section 7.2, this study does not need to be conducted below a lower limit of -20°C.