potassium titanium oxide (K2Ti6O13)

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

15 January 1999 to 19 January 1999

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of relevant results.

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Version / remarks:

92/69/EEC (Annex V of Council Directive 67/548/EEC)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Date of inspection: 23rd March 1998 Date of signature: 21st July 1998

Type of method:

effusion method: vapour pressure balance

Temp.:

25 °C

Vapour pressure:

< 0 Pa

No statistical analyses were performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate of the maximum value for the vapour pressure at 25° C.

Run 4 was chosen because the sample had been under vacuum for the longest period prior to this run and so degassing would have been the most complete. The reading at 249° C (522.15 K) was chosen because this is the data point which gives the highest estimated vapour pressure at any given temperature when a slope of -1500 K is imposed upon it. The value of -1500 K is an in-house value and is the shallowest slope observed whilst determining the vapour pressure on a wide range of samples using the vapour pressure balance method. Extrapolation to 25° C gave a vapour pressure 2.247 x 10-5 Pa a which has been taken as a maximum value for this material. The test material did not change in appearance under the conditions used in the determination.

Conclusions:

The vapour pressure of the substance has been determined to be less than 2.3 x 10-5 Pa at 25 °C.

Executive summary:

The vapour pressure of substance has been determined to be less than 2.3 x 10^-5 Pa at 25 °C.

Description of key information

The vapour pressure of the substance has been determined to be less than 2.3 x 10-5 Pa at 25 °C.

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

25 °C

Additional information

The vapour pressure of the substance has been determined to be less than 2.3 x 10^-5 Pa at 25 °C.

The test described above meet the requirements of OECD Test Guidelines and are assigned to be reliability 1 data according to the scoring system of Klimisch et al (Klimischet al., 1997). This ranking was deemed appropriate because the studies were conducted at the GLP certified laboratory and were in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of relevant results.