Diethylammonium chloride

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:

23 Jul - 11 Aug 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other:

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

no

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

Storage conditions: ambient temperature (10 – 30 °C)

Melting / freezing pt.:

ca. 231.8 °C

Atm. press.:

ca. 1 013 hPa

Remarks on result:

other: The capillary method measurement showed that the test item melted in a temperature range of 218°C to 238°C.

Results
DSC
Two DSC measurements showed two endothermal effects in the ranges 95 – 115 °C and 215 – 235 °C. The second endothermal effect was directly followed by an exothermal effect. Because of this, an additional measurement with the capillary method was done.

Due to the result from the capillary measurement, additional DSC measurements were done to exclude the influence of the crucible material on the results. Only these measurements in glass crucibles with a heating rate of 10 K/min were used for the final evaluation.

Two endothermal effects were seen in the ranges of 100 – 125 °C and 225 – 255 °C, before boiling. Based on results from the capillary melting, it was concluded that the test item melted during the second endothermal effect, it had a melting point of 231.8 °C.

Table 1- Melting point (DSC)

Test item [mg]	Starting temperature [°C]	Final test temperature [°C]	Temperature range (melting) [°C]	Onset [°C]	Crucible	Observations
12.60	25	500	95 – 115 215 – 235	Ambiguous	Aluminium with a hole	Crucible was empty after measurement
9.43			95 – 110 220 – 235
13.46			100 – 125 225 – 250	n.r. 231.5	Glass, open	Measurement continued after melting
20.25			100 – 125 225 - 255	n.r. 232.0

n.r. not relevant

Melting Point: Capillary tube in a metal block
Table 2 - Results

Set point [°C]	Heating rate [K/min]	End point [°C]	Remarks
80	10	400	Approx. 94 °C: test item appeared glassy Approx. 218 °C: test item started to melt Approx. 238 °C: test item fully melted
			Approx. 101 °C: test item appeared glassy Approx. 221 °C: test item started to melt Approx. 237 °C: test item fully melted

 

The capillary method showed that the test item melted in the temperature range of 218 – 238 °C.

Conclusion: The test item has a mean melting point of 231.8 °C.

Description of key information

231.8 °C at 1013 hPa (OECD 102, DSC)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

231.8 °C