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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:
2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
yes
Remarks:
Open aluminum pans were used under nitrogen purge at 25 mL/min. This is a discrepancy from the OECD Guideline. The OECD Guideline calls for a plate instead of a pan.
GLP compliance:
not specified
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
- Name of test material (as cited in study report): Aerophine 3418A Promoter, stripped
- IUPAC nomenclature - Sodium diisobutyldithiophosphinate
- Lot WEA102051
- Appearance - White powder with lumps
- CAS No. 13360-78-6
- Molecular Formula - C8H18PS2.Na
- Molecular Weight - 232 g/mole
- Purity > 99%
Temp.:
20 °C
Vapour pressure:
0.112 Pa
Temp.:
25 °C
Vapour pressure:
0.121 Pa

The vapor pressure equation in Pascal is: Y = -586.25X + 1.0508

R² = 0.9967 where Y = log Pressure (Pa), and X = 1/K.

Conclusions:
The estimated vapor pressure of the test substance at 20°C is 0.112 Pa. The estimated vapor pressure of the test substance at 25°C is 0.121 Pa.
Executive summary:

The vapor pressure of the test substance was determined by using an effusion method incorporating isothermal thermogravimetric analysis (TGA). The TGA method is based on the determination of accelerated evaporation rates for the test substance at elevated temperatures and ambient pressure. The estimated vapor pressure of the test substance at 20°C is 0.112 Pa. The estimated vapor pressure of the test substance at 25°C is 0.121 Pa. The vapor pressure can be interpolated from room temperature up to 180°C. Afterwards, a phase change occurs when the test substance melts.

Description of key information

The estimated vapor pressure of the test substance at 20°C is 0.112 Pa. The estimated vapor pressure of the test substance at 25°C is 0.121 Pa. 

Key value for chemical safety assessment

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

Additional information

The vapor pressure of the test substance was determined by using an effusion method incorporating isothermal thermogravimetric analysis (TGA). The vapor pressure equation is Y = -586.25X + 1.0508 with R² = 0.9967. Y = log Pressure (Pa), and X = 1/K. The vapor pressure can be interpolated from room temperature up to 180°C. Afterwards, a phase change occurs when the test substance melts.