Silicic acid (H4SiO4), tetraethyl ester, reaction products with bis(acetyloxy)dioctylstannane

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Data waiving:

study technically not feasible

Justification for data waiving:

other:

Data source

Reference

Reference Type:

other: statement

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

yes

Remarks:

study technical not feasible

Principles of method if other than guideline:

1.Dynamic method according EG A.4. 1.6.1:
The vapor pressure curve for a mixture of substances does not lead to very sensible mathematically calculable relationship to Clausius-Clapeyron. This is because the mixture of substances changed during the experiment in its composition. The equilibrium of the boiling temperature / pressure pairs therefore agree with increasing and decreasing pressure do not coincide. This is a policy-compliant evaluation is not possible

2. Effusion methode according to EG A.4. 1.6.5
The measuring range is up to. 1 Pa. For higher steam pressures, the method is not suitable, since the mass loss too high and thus are no longer constant in unit time. Because of the TES, but 28 are already vapor pressures in the range expected by 10 hPa. A test carried out at 25 ° C and 40 ° C was too low vapor pressures in the range between 0.1 and 0.3 hPa

3. Static methode according to EG A.4. 1.6.2:
There is no equilibrium after previous cooling and degassing. I.e. the vapor pressure in the closed apparatus at the set measurement temperature of 25 ° C min of about 20 hPa in the first measurement after 30th Based on more and more. h. After about 4, a steam pressure of 100 hPa is reached without a balance would have set a plateau in Druck-/Zeitdiagramm. A repetition of the experiment showed similar behavior.
Possible reasons: a change in composition due to decomposition or reactions such as with metallic material of the apparatus.
.

Type of method:

other: diverent, see free text

Test material

Test material information

Constituent 1

Reference substance name:

Silicic acid (H4SiO4), tetraethyl ester, reaction products with bis(acetyloxy)dibutylstannane

EC Number:

300-344-4

EC Name:

Silicic acid (H4SiO4), tetraethyl ester, reaction products with bis(acetyloxy)dibutylstannane

Cas Number:

93925-42-9

IUPAC Name:

93925-42-9