2-methylbenzene-1,4-diyl bis{4-[3-(acryloyloxy)propoxy]benzoate}

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03 APR 2000 - 21 JUN 2000

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Version / remarks:

Guuideline 92/69/EEC of 31 July 1992

Deviations:

no

GLP compliance:

yes

Type of method:

effusion method: vapour pressure balance

Temp.:

25 °C

Vapour pressure:

< 0 Pa

Remarks on result:

other: The vapour pressure at 20 and 50°C is also below the reported value.

As a precaution a Differential Scanning Calorimetry (DSC) was performed. The measurement in a closed glass pan shows an endothermal effect (melting) in the range 50-90 °C and an exothermal decomposition in the range 185-310 °C, with a decomposition energy of 268 J/g and a second one in the range 355-450 °C, with a decomposition energy of 328 J/g.

The vapour pressure was measured in the temperature range of 19.5 °C to 148.5 °C.

In the temperature range 19.5 °C up to 105 °C no increase in weight and therefore novapour pressure of the test substance was registered.

The signals in the range 105.3 °C up to 148.5 °C were near the lower measuring limit and showed a course which is untypical for a vapour pressure / temperature dependence.

The following table shows the measured pressure data at the corresponding temperatures.

Temperature [°C]	Vapour pressure [hPa]
103.3	8.6 x 10^-6
111.2	2.6 x 10^-5
114.5	2.2 x 10^-5
119.0	2.6 x 10^-5
124.9	2.7 x 10^-5
128.5	2.7 x 10^-5
134.5	2.7 x 10^-5
140.3	2.3 x 10^-5
145.9	2.7 x 10^-5
148.5	1.8 x 10^-5

The figure (attached as background material) gives the logarithm of vapour pressure as a function of the inverse temperature (1/T, T in Kelvin). Only for better readability the temperature is reported in centigrade scale.

Conclusions:

The vapour pressure at 20, 25 or 50 °C can be assumed to be below 3 x 10E-5 hPa.

Executive summary:

The vapour pressure was determined according to Guideline 92/69/EEC A.4 under GLP conditions. The vapour pressure at 20, 25 or 50 °C can be assumed to be below 3 x 10^-5 hPa.

Description of key information

The vapour pressure was determined according to Guideline 92/69/EEC A.4 under GLP conditions. The vapour pressure at 20, 25 or 50 °C can be assumed to be below 3 x 10^-5hPa.

Key value for chemical safety assessment

Vapour pressure:

0 hPa

at the temperature of:

25 °C

Additional information

The real vapour pressure is below the above mentioned value, because no change in sample weight was measured at temperatures between 19.5 and 105 °C. Therefore real vapour pressure at a temperature of 25 °C must be lower than the vapour pressure determined from a temperature of 105 °C and higher.