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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:
28 March to 09 April 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
The study was conducted according to an internationally recognised method, and under GLP. The test substance is adequately characterised. Therefore full validation applies.
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point/Boiling Range)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
method according to Siwoloboff
Specific details on test material used for the study:
EssentÍal oil of Summer Savory/batch No. SSVI.ES.sample
Date of manufacture: 08.01.2019
Expration date of the batch: 08.01.2021
UVCB substance;
Purity test date: 18.01.2019
Key result
Boiling pt.:
115 °C
Atm. press.:
1 013.3 hPa
Decomposition:
yes
Decomp. temp.:
115 °C

The Observations and the measured values are presented in the following tables.

Table: Boiling point (DSC measurements)

Test item/mg

Starting temperature/°C

Final test temperature/°C

Temperature range (endothermal)/°C

Onset (boiling)/°C

Crucible

Observations after the measurement

14.28

25

-80

-80

500

115-250

multistage

Aluminium with a hole

Mass loss 100 %

12.38

25

300

150-265

multistage

Aluminium with a hole

Mass loss 100 %

Table: Boiling point (results of the capillary method)

No

Set point/°C

Heating rate/K/min

Endpoint/°C

Remarks

1

100

10

300

Approx. 115 °C: starting formation of bubbles

Approx. 195 °C: increasing formation of bubbles

Approx. 209 °C: test item boiled

Approx. 260 °C: decreasing formation of bubbles

Approx. 278 °C: formation of white steam/smoke and increasing formation of bubbles

Afterwards: test item discoloured to a darker shade

Conclusions:
The initial boiling temperature of the test item has been determined to be 115 °C, at atmospheric pressure (1013.3 hPa).
Executive summary:

The initial boiling point of the test item was measured under GLP according to OECD 103 / EU A2 guideline, by two DSC measurements in aluminium crucibles with a hole showed a multistage endothermal effect in the temperature range of 115-265 °C. A measurement with the capillary method was performed to clarify the results of the DSC measurements. Since this measurement was performed only as a verifying screening a high heating rate of 10 K/min was chosen. Under consideration of the results from the DSC measurements and the capillary method it was concluded that the test item boiled under decomposition starting at approximately 115 °C.

Description of key information

The test item had boiled at atmospheric pressure (1013.3 hPa) under decomposition starting at 115°C.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
115 °C

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. It is considered as a key study.

Two DSC measurements in aluminium crucibles with a hole showed a multistage endothermal effect in the temperature range of 115-265 °C. No further endothermic or exothermic effects were observed up to the final temperature (500 °C). The mass loss after the DSC measurements amounted to 100 %. A measurement with the capillary method was performed to clarify the results of the DSC measurements. 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 approximately 5 mm. Under consideration of the results from the DSC measurements and the capillary method it was concluded that the test item boiled under decomposition starting at approximately 115 °C.