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

Stability: thermal, sunlight, metals

Link to relevant study record(s)

Reference

Endpoint:

thermal stability

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

2011-07-08

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

Test substance thermally stable:

yes

Operating temp.:

>= 92 - <= 700 °C

Remarks on result:

other: Overall weight loss onset occurs at 324°C

Sublimation:

no

Transformation products:

not measured

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 @ 700 °C
		Derivative Peak or Range (°C)	%W Loss
Test Material	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

Thermal decomposition and overall weight loss onset occurs at 324 ˚C, excluding minimal solvent content (Thermogravimetric analysis).

 

The substance is a viscous liquid. However, testing for corrosion to metals is not a standard REACH endpoint, and experience in handling and use demonstrates that the substance does not materially damage or destroy metals. Further investigation is therefore considered unnecessary.

Additional information

Thermal stability of the test substance was determined using Thermogravimetric Analysis (TGA). 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. The first weight loss event appears at a derivative peak of 92 ˚C and accounts for approximately 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 approximately 83.3 % weight loss. The third weight loss event occurs at a derivative peak of 422 ˚C and accounts for approximately 10.8 % weight loss, up through exposure to 700 ˚C. 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.

Justification for classification or non-classification

The test material is stable to thermal decomposition at temperatures up to 324 °C and is not expected to damage or destroy metals.