Hydrocarbons, C4-7, C5-rich, isoprene-purifn. by-product

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

17. June 2011

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study performed according to OECD guideline but not under GLP conditions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2011

Report date:

2011

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Principles of method if other than guideline:

Procedure

Thermal Stability: Differential Scanning Calorimetry
The thermal stability was determined by differential scanning calorimetry (DSC). The test item and the standard material (aluminium oxide) were heated up from ambient temperature to the final temperature (200 °C) at a constant heating rate (3 K/min) in a defined atmosphere (nitrogen). Closed glass crucibles were used as containers for the test item and the standard material. The quantity of heat absorbed or released was measured and recorded. Approx. 11 mg of the test item were used.
Melting Point / Melting Rang, Boiling Point / Boiling Range: Differential Scanning Calorimetry
The determination of the melting point / boiling point was carried out by differential scanning calorimetry (DSC). The test item was heated up from ambient to the final temperature (500 °C) at a constant heating rate (10 K/min) in a defined atmosphere (nitrogen). The quantity of heat absorbed or released was measured and recorded. Aluminium crucibles with a small hole were used as containers for the test item and as empty reference crucible. About 9 mg to 12 mg of the test item were used.

GLP compliance:

no

Type of method:

other: differential scanning calorimetry (DSC)

Test material

Test material information

Constituent 1

Reference substance name:

Absorbent A4

IUPAC Name:

Absorbent A4

Details on test material:

- Name of test material (as cited in study report): Absorbent A4
- Substance type: UVCB
- Physical state: Transparent liquid without mechanical impurities, colour from light to dark
- Stability under test conditions: months
- Storage condition of test material: room temperature, in the dark

Results and discussion

Melting / freezing point

Melting / freezing pt.:

> -100 °C

Atm. press.:

ca. 101 kPa

Decomposition:

no

Sublimation:

no

Any other information on results incl. tables

Individual Results

Thermal Stability (DSC)

The DSC-measurement in a closed glass crucible with the test item showed no exothermic effect up to the end of the measurement at 200 °C.

Melting Point / Melting Range (DSC)

Two measurements in aluminium crucibles with a hole showed no defined endothermic effects in the temperature range -100 °C to ambient temperature.

Ident-No.	Onset / °C	Test temperature range / °C	Crucible
31874	-	-100 - 500	Aluminium crucible with a hole
31876	-	-100 - 300	Aluminium crucible with a hole

The test item has no melting point above -100 °C under atmospheric conditions. However both measurements showed a shoulderlike endothermic effect in the temperature range -100 °C to -10 °C. This effect could very well be caused by the melting of some of the many compounds of which the test item is assembled. Possibly a distinctive melting point could not be determined due to the large number of substances included in the test item.

Applicant's summary and conclusion

Conclusions:

The test item has no melting point above -100 °C under atmospheric conditions.

Executive summary:

The test item has no melting point above -100 °C under atmospheric conditions.