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Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
1. Hypothesis for the analogue approach:
The hypothesis for the analogue approach is that the test substance GTL Gasoil is the starting material from which the registration substance, Hydrocarbons, C18-C24, iso-alkanes, <2% aromatics (GS310), is produced by fractional distillation. The source substance contains constituents of the target substance, Hydrocarbons, C18-C24, iso-alkanes, <2% aromatics, although it covers a wider carbon number distribution. The substances therefore have qualitatively similar properties (RAAF Scenario 2 applies).
2. Source and target chemical(s)
The source substance GTL Gasoil (C8-C26) (C8-C26 branched and linear hydrocarbons – Distillates) is the substance from which the registration substance is produced. GTL Gasoil is composed of linear, branched and cyclic hydrocarbons of chain length C8-C26.
The target substance, Hydrocarbons, C18-C24, iso-alkanes, <2% aromatics, is composed linear, branched and cyclic hydrocarbons of chain length C18-24
3. Analogue approach justification
The constituents of the source and target substances are all hydrocarbons. Identical constituents have identical physicochemical properties.
Reason / purpose for cross-reference:
read-across source
Melting / freezing pt.:
< 253 K
Atm. press.:
1 013 hPa
Endpoint:
melting point/freezing point
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
March 2005
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Study conducted to GLP and in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not effect the quality of the relevant results. Read-across is considered to be reliability 2.
Justification for type of information:
See Melting point / freezing point Target record
Reason / purpose for cross-reference:
other: Target record
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
method to determine freezing temperature
Remarks:
Crystallisation point measure
Melting / freezing pt.:
< -20 °C
Atm. press.:
1 013 hPa

Determination 1

Time (s) Temperature (K) Time (s) Temperature (K)
0 294 1260 267
30 293 1290 266
60 292 1320 266
90 291 1350 266
120 290 1380 265
150 289 1410 265
180 287 1440 265
210 287 1470 265
240 286 1500 265
270 284 1530 264
300 283 1560 264
330 282 1590 264
360 282 1620 264
390 281 1650 263
420 280 1680 263
450 279 1710 263
480 279 1740 263
510 278 1770 262
540 277 1800 262
570 276 1830 262
600 276 1860 262
630 275 1890 262
660 275 1920 261
690 274 1950 261
720 274 1980 261
750 274 2010 261
780 273 2040 260
810 273 2070 260
840 272 2100 260
870 272 2130 260
900 271 2160 259
930 271 2190 259
960 270 2220 259
990 270 2250 259
1020 270 2280 258
1050 269 2310 258
1080 269 2340 258
1110 269 2370 257
1140 268 2400 257
1170 268 2430 257
1200 267 2460 257
1230 267 2490 257
2520 257 2880 254
2550 256 2910 254
2580 256 2940 254
2610 256 2970 254
2640 256 3000 254
2670 255 3030 253
2700 255 3060 253
2730 255 3090 253
2760 255 3120 253
2790 255 3150 253
2820 255 3180 253
2850 254 3210 252

Determination 2

Time (s) Temperature (K) Time (s) Temperature (K)
0 294 1080 262
30 292 1110 262
60 290 1140 262
90 288 1170 261
120 286 1200 261
150 284 1230 261
180 283 1260 260
210 281 1290 260
240 280 1320 259
270 279 1350 259
300 277 1380 258
330 276 1410 258
360 275 1440 258
390 275 1470 257
420 274 1500 257
450 274 1530 257
480 273 1560 257
510 272 1590 256
540 272 1620 256
570 271 1650 256
600 270 1680 256
630 270 1710 256
660 269 1740 255
690 268 1770 255
720 268 1800 255
750 267 1830 255
780 267 1860 254
810 266 1890 254
840 266 1920 254
870 265 1950 254
900 265 1980 253
930 264 2010 253
960 264 2040 253
990 263 2070 253
1020 263 2100 253
1050 263 2130 252

Calculation

Measured temperatures were converted from °C to K using the following equation:

T = t + 273.15

where:

T = temperature (K)

t = temperature (°C)

Observations

The test material became increasingly opaque and viscous from approximately 275 K, resulting in a white, opaque, viscous ‘slush-like’ state on completion of the test.

Conclusions:
The true freezing temperature of the test material, that at which it completely solidifies, has been determined to be less than 253 ± 0.5 K. However on cooling, the test material became increasingly opaque and viscous from approximately 275 K, resulting in a white, opaque, „slush-like“ state on
completion of each test.
Executive summary:

The freezing temperature of the test material was determined using EU Method A.1, whereby the following method was used: Crystallisation point measure.

The true freezing temperature, that at which it completely solidifies, has been determined to be less than 253 ± 0.5 K (arithmetic mean of two determinations). However on cooling, the test material became increasingly opaque and viscous from approximately 275 K, resulting in a white, opaque, „slush-like“ state on completion of each test.

Description of key information

pour point of the test material: <253 ± 0.5 K.

Key value for chemical safety assessment

Additional information

The pour point of the read-across substance (Distillates (Fischer-Tropsch), C8-26, branched and linear) was determined using Method A1 of Commission Directive 92/69/EEC, and was determined to be<253 ± 0.5 K.