Orthoboric acid, compound with 2,2',2''-nitrilotriethanol

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 Sep 2017 - 15 Nov 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

2008

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

1998

Deviations:

no

GLP compliance:

yes

Type of method:

differential scanning calorimetry

Test material

Test material information

Constituent 1

Reference substance name:

Reference substance 001

Cas Number:

10049-36-2

Test material form:

liquid

Details on test material:

Physical appearance: amber / yellow liquid
Storage conditions: at room temperature

Results and discussion

Melting / freezing point

Key result

Decomposition:

yes

Remarks on result:

other: Glass transition point: -72.6°C. No melting/freezing point between 25°C and -90°C. Reaction and/or decomposition of the test item occurred during the DSC experiments. Decomp. temp was not determined.

Any other information on results incl. tables

TGA EXPERIMENT (PRELIMINARY TEST)

Significant decrease of weight from 125°C. 25% weight loss at 188°C and 70% at 399°C.

After the experiment, a dark brown molten residue remained in the sample container (original colour: amber). The change of the colour indicated reaction and/or decomposition of the test item.

 

DSC EXPERIMENT 1

During cooling a glass transition was observed between-50°C and -80°C.  During heating a glass transition was observed between -50°C and -90°C (inflection point :-72.838°C). 

A broad endothermic effect was observed between 50°C and 150°C. This effect might have been due to evaporation of a component of the test item or to reaction and/or decomposition of the test item. 

From 150°C on, an exothermic effect was observed. After the experiment, an off-white molten residue remained in the sample container.  The change of the colour supported reaction and/or decomposition of the test item. 

DSC EXPERIMENT 2

Similar results as in Experiment 1 were obtained. The inflection point of the glass transition was -72.381°C. After the experiment, an off-white molten residue remained in the sample container.

DATA HANDLING

The glass transition temperature was determined as the mean inflection point of Experiment 1 and Experiment 2.

 

Applicant's summary and conclusion

Conclusions:

A glass transition temperature of -72.6°C was determined. The substance has no melting/freezing temperature between 25°C and -90°C.

Executive summary:

Differential Scanning Calorimetry (DSC) experiments were performed in a GLP study according to EC A.1, OECD 102 and OPPTS 830.7200.

The liquid substance has no melting/freezing temperature between 25°C and -90°C. From duplicate measurements the mean glass transition temperature was determined to be -72.6°C.

During heating from -90°C to 188°C reaction and/or decomposition of the substance was assumed to be occuring in the range between 50°C and 150°C

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