Titanium oxide sulphate

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2010-04-16 to 2010-09-22

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study reliable without restrictions.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed, 2009-10-29

Type of method:

thermal analysis

Remarks:

differential scanning calorimetry (DSC)

Test material

Test material information

Constituent 1

Reference substance name:

Titanium oxide sulphate

EC Number:

237-523-0

EC Name:

Titanium oxide sulphate

Cas Number:

13825-74-6

Molecular formula:

O5STi

IUPAC Name:

Titanium(IV) Oxysulfate

Constituent 2

Reference substance name:

123334-00-9

Cas Number:

123334-00-9

IUPAC Name:

123334-00-9

Details on test material:

- Name of test material (as cited in study report): Titanium(IV)oxysulfate – sulphuric acid hydrate
- Molecular formula (if other than submission substance): TiOSO4 * xH2SO4 * xH2O
- Substance type: White solid
- Storage condition of test material: Ambient temperature, dry, tightly closed

No further information was stated.

Results and discussion

Melting / freezing point

Melting / freezing pt.:

> 500 °C

Atm. press.:

ca. 1 024 hPa

Any other information on results incl. tables

Individual Results

Thermal Stability (DSC):

A DSC-measurement in a closed glass crucible showed a multistep endothermic effect in the temperature range of 190 – 330 °C. No further effects were observed up to the maximum temperature (350 °C).

 

Melting Point / Melting Range (DSC)

Due to a possible reaction of the test item (test item contains sulphuric acid) with aluminium crucibles the measurements were performed in open glass crucibles. The measurements in open glass crucibles showed an endothermic effect in the temperature range 60 to 380 °C:

Ident-No.	Onset / °C	Temperature range / °C	Crucible
30486	115.88	60 to 320 °C	Open glass
30487	118.56	60 to 380 °C	Open glass

 

An optical inspection of the test item after the measurement showed that the test item was caked but not molten. An additional measurement with the capillary method was performed in order to clarify the results of the DSC measurements:

 

No.	Set point	Heating rate	End point	Melting point	Remarks
1	50 °C	10 K/min	400 °C		200 °C: discolouration at the surface of the test item to greyish   400 °C: discolouration of the test item to yellowish   After cooling the colour of the test item returns to white and the test item is caked

 

Thus it was concluded, that the test item does not melt within the tested temperature range of 25 – 500 °C.

Boiling Point / Boiling Range (DSC):

As no melting was observed, no boiling point could be quoted.

Applicant's summary and conclusion

Conclusions:

The test item shows no melting or boiling in the temperature range of 25 – 500 °C.

Executive summary:

The melting point of test item itanium(IV)oxysulfate – sulphuric acid hydrate (molecular formula TiOSO4 x H2SO4 x H2O; CAS No. 123334-00-9) was determined following the protocol as given by OECD Guideline 102. As result of the measurement the melting point is > 500 °C. Substance was caked and showed discoloration, but was not molten.