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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Proprietary guideline study
Qualifier:
according to guideline
Guideline:
other: ASTM D 2879-97 (2007)
GLP compliance:
not specified
Type of method:
isoteniscope
Temp.:
20 °C
Vapour pressure:
17.26 mm Hg
Remarks on result:
other: Run 1 (2.3kPa)
Temp.:
20 °C
Vapour pressure:
17.3 mm Hg
Remarks on result:
other: Run 2 (2.31KPa)
Temp.:
20 °C
Vapour pressure:
17.27 mm Hg
Remarks on result:
other: Run 3 (2.3KPa)

The vapour pressure of a 10% solution of hexafluorosilicic acid at 20°C and 2.3 KPa was 17.26 to 17.30 mm Hg.

Conclusions:
The vapour pressure of a 10% solution of hexafluorosilicic acid at 20°C and 2.3 KPa was 17.26 to 17.30 mm Hg.
Executive summary:

The vapour pressure of a 10% solution of hexafluorosilicic acid at 20°C and 2.3 KPa was 17.26 to 17.30 mm Hg.

Description of key information

The vapour pressure of a 10% aqueous solution of hexafluorosiclic acid is reported to be 2.30 kPa at 20 degrees Celcius. The vapour pressure of a 35% aqueous solution of hexafluorosilicic acid is reporetd to be 30 hPa at 20 degrees Celsius.

At 20°C, the vapor pressure of water is about 2.34 kPa at 20°C and about 3.17 kPa at 25°C.

Hence, the vapour pressure of the registered substance (aqueous solution) is similar to the vapor pressure of water plus the release of hydrogen fluoride vapour (IPCS, 2004).

The partial pressure of the Fluorine compounds vary between 0.015kPa for an acid of 32% H2SiF6 concentration and 0.003kPa for an acid of 23% H2SiF6 concentration at 293 K.

Key value for chemical safety assessment

Vapour pressure:
2 300 Pa
at the temperature of:
293 K

Additional information

The vapour pressure of a 10% aqueous solution of hexafluorosiclic acid is reported to be 2.30 kPa at 20 degrees Celcius (REACH Centre, 2010). The vapour pressure of a 35% aqueous solution of hexafluorosilicic acid is reporetd to be 30 hPa at 20 degrees Celsius.

At 20°C, the vapor pressure of water is about 2.34 kPa at 20°C and about 3.17 kPa at 25°C.

Hence the vapour pressure of the registered substance (aqueous solution) is similar to the vapor pressure of water plus the release of hydrogen fluoride vapour (IPCS, 2004).