Fatty acids, tall-oil, reaction products with boric acid (H3BO3) and diethanolamine

Boiling point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

boiling point

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Reference 2

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Reason / purpose for cross-reference:

reference to same study

Principles of method if other than guideline:

Thermogravimetric Analysis (TGA) is used to measure weight loss, i.e. decomposition, as a function of time and/or temperature. These analyses were performed using a TA Instruments Q5000IR. High resolution TGA allows a change in heating rate at temperatures where weight loss is occurring. A maximum heating rate is prescribed via computer control based on a resolution designed to give resolution of peaks, however, the heating rate slows to near isothermal conditions during weight loss.

GLP compliance:

not specified

Overall weight loss onset occurs at 324 ˚C, excluding minimal solvent content.  The first weight loss event appears at a derivative peak of 92 ˚C and accounts for ~2.2% weight loss of the material. This is followed by a second (most significant) weight loss event at a derivative peak of 345 ˚C, accounting for ~83.3% weight loss. The third weight loss event occurs at a derivative peak of 422 ˚C and accounts for ~10.8% weight loss, up through exposure to 700 ˚C.

Table 1 – TGA Data (maximum heating rate 10 ˚C / min, resolution 3)

Sample	Overall Onset of Weight Loss (˚C) Excluding Solvent	Thermal Events		%W Residue at 700 °C
		Derivative Peak or Range (°C)	%W Loss
Test Substance	324	92	2.2	3.7
		345	83.3
		422	10.8

Conclusions:

Using TGA, with a maximum temperature ramp of 10 °C per minute and a resolution setting of 3 in an atmosphere of nitrogen, overall weight loss onset occurs at 324 ˚C, excluding minimal solvent content.

Executive summary:

Test Guidance

Thermogravimetric Analysis (TGA)

Method and material

TGA is used to measure weight loss, i.e. decomposition, as a function of time and/or temperature. These analyses were performed using a TA Instruments Q5000IR. High resolution TGA allows a change in heating rate at temperatures where weight loss is occurring. A maximum heating rate is prescribed via computer control based on a resolution designed to give resolution of peaks, however, the heating rate slows to near isothermal conditions during weight loss.

Result

The first weight loss event appears at a derivative peak of 92 ˚C and accounts for ~2.2% weight loss of the material. This is followed by a second (most significant) weight loss event at a derivative peak of 345 ˚C, accounting for ~83.3% weight loss. The third weight loss event occurs at a derivative peak of 422 ˚C and accounts for ~10.8 % weight loss, up through exposure to 700 ˚C.

Conclusion

With a maximum temperature ramp of 10 °C per minute and a resolution setting of 3 in an atmosphere of nitrogen, overall weight loss onset occurs at 324 ˚C, excluding minimal solvent content.

Description of key information

The substance is a liquid which undergoes decomposition before boiling.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

324 °C

Additional information

Using thermogravimetric analysis (TGA), with a maximum temperature ramp of 10 °C per minute and a resolution setting of 3 in an atmosphere of nitrogen, overall weight loss onset occurs at 324 ˚C, excluding minimal solvent content. A boiling point study is therefore scientifically unjustified.