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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 February 15, 2002 to february 20, 2002

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

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)

Type of method:

differential scanning calorimetry

Remarks:

glass crucible (closed and open)

Specific details on test material used for the study:

Purity: 98.2%
White, coarse grained substance

Key result

Decomposition:

yes

Decomp. temp.:

ca. 188 °C

Remarks on result:

other: no melting or boiling point

Observations:

In the temperature range between approximately 55°C to 70°C, a partial change in the optical properties of the test substance was seen. From this temperature up to approx. 188°C, no melting was observed. Beginning at this temperature, the sample became soft and partially liquid. At the top margin of the sample, the test substance turned brown. These effects intensified until 230°C when a volume contraction of the sample was observed. Starting at this temperature, evolving of gas bubbles occured. Finally, at 235°C, the sample was divided in two fractions, one liquid and one solid. After cooling down the sample to room temperature, the melted phase remained liquid.

(No transitional period).

Conclusions:

Under the study conditions, the test substance had no melting or boiling point. It started to decompose at a mean-onset temperature of 189°C.

Executive summary:

A study was conducted to determine the melting point / freezing point of the test substance, C12-14 TMAC, according to OECD Guideline 102 and EU Method A.1. Two independent tests: 1. Visual observation and 2. DSC - glass crucible (closed and open) were conducted. In the temperature range from approximately 55°C to 70°C, a partial change in the optical properties of the test substance was seen. From this temperature up to approximately 188°C, no melting was observed. Beginning at this temperature, the sample became soft and partially liquid. At the top margin of the sample, the test substance became brown. These effects intensified until 230°C when a volume contraction of the sample was observed. Starting at this temperature, evolving of gas bubbles occured. Finally, at 235°C, the sample was divided in two fractions, one liquid and one solid. After cooling down the sample to room temperature, the melted phase remained liquid. Under the study conditions, the test substance had no melting or boiling point. It started to decompose at a mean-onset temperature of 189°C (Schneider, 2002).

Description of key information

Melting point was determined using differential scanning calorimetry, according to OECD Guideline 102 and EU Method A.1 (Schneider, 2002).

Additional information

No melting point was determined; as the test substance undergoes decomposition at 189°C.