Tributyl-2-methoxypropylphosphonium salt with 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl)ethylidene]bis[phenol]

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

12 July 2011 - 05 August 2011

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

This study uses a guideline method conducted under GLP. MTDID 3285 is a mixture which undergoes decomposition just above the melting point. Vapor pressure methods can only be applied for compounds that do not decompose under the conditions of the test. However the result attempts to sets an upper limit on the possible vapor pressure range rather than establishing the vapor pressure.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2011

Report date:

2011

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

yes

Remarks:

The test substance decomposes under the test conditions.

GLP compliance:

yes

Type of method:

effusion method: by loss of weight or by trapping vaporisate

Test material

Test material information

Constituent 1

Reference substance name:

MTDID 3285

IUPAC Name:

MTDID 3285

Details on test material:

- Name of test material (as cited in study report): MTDID 3285
- Physical state: solid
- Analytical purity: 86.67%
- Stability under test conditions: stable
- Storage condition of test material: at room temperature in the dark

Results and discussion

Vapour pressure

Temp.:

20 °C

Vapour pressure:

0.002 Pa

Transition / decomposition

Transition / decomposition:

yes

Remarks:

The MP/BP study reports decomposition of MTDID 3285 just above the melting temperature. The vapor pressure was measured as a function of increasing temperatures which spans MTDID 3285's melting point. Therefore, decomposition has taken place.

Transition temp.:

ca. 93 °C

Any other information on results incl. tables

The weight loss curve of MTDID 3285 shows that it contains volatile compounds. These volatile compounds are potentially decomposition products or original components of the mixture.

Figure 5. (Weight loss curve of MTDID 3285) --> SEE ATTACHMENT 1

Because the weight loss of MTDID 3285 at 110°C, 120 °C, 130°C, and 140°C was lower than the weight loss of hexachlorobenzene at the same temperatures, it was concluded that vapor pressure of MTDID 3285 is below that of hexachlorobenzene.

Figure 6. (Weight loss curve of hexachlorobenzene) --> SEE ATTACHMENT 2

An exact vapor pressure for MTDID 3285 was not calculated. According to OECD TG 104, vapor pressure methods can only be applied for compounds that do not decompose under the condition of the test.

Applicant's summary and conclusion

Conclusions:

The vapor pressure of MTDID 3285 is < 0.0015 Pa at 20°C.

Executive summary:

The vapor pressure of MTDID 3285 was measured using an isothermal thermogravimetric effusion method. The weight loss of MTDID 3285 was measured continuously as a function of time and temperature covering a temperature range of 30 °C to 240 °C. Based on the weight loss of the most volatile components of MTDID 3285 being lower than that of hexachlorobenzene at 110°C - 140°C, the vapor pressure of MTDID 3285 was concluded to be less than hexachlorobenze's vapor pressure at 20°C (0.0015 Pa).

According to OECD TG 104, vapor pressure measurements can only be applied for compounds that do not decompose under the condition of the test. MTDID 3285 undergoes decomposition at temperatures just above the melting point. No method is suitable for determing vapor pressure of ionic compounds of this nature. The conditions of the test should be such that weight loss measurements are made prior to decomposition. The weight loss comparison to a reference substance should also be made in the same range. The study result only sets an upper limit on the possible vapor pressure rather than establishing the vapor pressure. Therefore, the study is classified as reliable with restrictions.