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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From mid of june to 06 july 2007
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study well described and according to the guideline, but not GLP.
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
no
Type of method:
static method
Temp.:
20 °C
Vapour pressure:
0.056 hPa
Remarks on result:
other: VP = 0.161 hPa at 30°C, 0.443 hPa at 40°C, 1.126 at 50°C.
Transition / decomposition:
no

Result consistency is checked by adjusting Antoine’s equation. In accordance with OCDE recommendations, relation between ln(P) and (T)-1 is plotted. Alignment of measurements is a guarantee of their consistency.

 

Ln P = A + B / T

Where P is the pressure (Pa) and T the temperature (K). Experimental data are fitted to give A and

B:

A = 33.9974 and B = -9459.47 K.

T (K)

Pexp (Pa)

Pcal (Pa)

DP (Pa)

 

293.14

5.5

5.6

0.1

 

303.10

16.1

16.3

0.2

 

313.12

44.3

44.1

-0.2

 

323.14

112.6

112.6

0.0

 

 

Table 1: Experimental results (Pexp) and calculated values by Antoine equation (Pcal).

Conclusions:
The vapour pressure determined at 293.15 K was 5.6 Pa.
Executive summary:

Vapour pressures of paradimethoxybenzene (CAS : 150-78-7) were measured. Product purity was 99.5%.

A static method, specially developed for very low pressures was used as suggested by OCDE’s guidelines (chemicals measurement n°104).

Vapour pressures were measured at 4 temperatures in the temperature range [323 – 293] K. Data were checked with the ANTOINE law.

The vapour pressure determined at 293.15 K was 0.042 mmHg ( 5.6 Pa ).

Description of key information

The vapor pressure from experimental study was 5.6 Pa at 20°C.

Key value for chemical safety assessment

Vapour pressure:
5.6 Pa
at the temperature of:
20 °C

Additional information

The experimental study (Processium 2007, OECD 104, GLP) was selected as key study.