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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-03-23 to 2018-08-23
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point/Boiling Range)
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
GLP compliance:
no
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
- Test item: Pationic ISL
- CAS No.: 66988-04-03
- Molecular weight: 450.59 g/mol
- Sum formula: C24H43O6Na
- Identity: 67.8% acid value, 213 saponification value
- Physical state: Yellow viscous liquid
- Storage: 10 °C - 30 °C
Key result
Boiling pt.:
240 °C
Atm. press.:
1 013.3 hPa
Decomposition:
yes
Decomp. temp.:
>= 240 °C

DSC measurement in aluminium crucibles with a hole showed an ambiguous endothermal effect in the temperature range of 250-330 °C (Table 1). Directly after the endothermal effect an exothermal effect started. The mass loss after the DSC measurement amounted to 78%.

Table 1: Boiling point (DSC measurement)

DSC run

Weigh-in / mg

Starting temperature / °C

Final test temperature / °C

Temperature range (endothermal) / °C

Onset (boiling) / °C

Crucible

Observations after the measurement

1

13.65

25

500

250 -330

ambiguous

Aluminium with hole

Mass loss 78%

Due to the ambiguous course an additional measurement with the capillary method was performed. Since this measurement was performed only as a verifying screening a high heating rate of 10 K/min was chosen and therefore the absolute temperature values derived with the capillary method are not as accurate as the DSC results. The filling height of the test item was approx. 5 mm. The results are summarised in Table 2.

Table 2: Results of the capillary method

No.

Set point / °C

Heating rate / K/min

End point / °C

Remarks

1

200

10

350

Approx. 240 °C: Starting formation of bubbles

Approx. 255 °C: Increasing formation of bubbles

Approx. 285 °C: Discolouration to yellow-orange

Approx. 299 °C: Increasing formation of bubbles and discolouration to orange

Approx. 320 °C: Discoloured to brown

Approx. 330 °C: Boiling

Approx. 350 °C: Discolouration to dark brown and decreasing formation of bubbles

Under consideration of the results from the DSC measurements and the capillary method it was concluded that the test item boiled partially under decomposition starting at 240 °C.

Conclusions:
The test item started to boil under decomposition at 240 °C under atmospheric pressure (1013.3 hPa).
Executive summary:

The boiling point of the test item was investigated by DSC measurement according to OECD 103 and confirmed by capillary method. The test item started to boil under decomposition at 240 °C under atmospheric pressure (1013.3 hPa).

Description of key information

The boiling point of the test item was investigated by DSC measurement according to OECD 103 and confirmed by capillary method. The test item started to boil under decomposition at 240 °C under atmospheric pressure (1013.3 hPa).

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
240 °C

Additional information