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Diss Factsheets

Physical & Chemical properties

Vapour pressure

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Endpoint:
vapour pressure
Type of information:
(Q)SAR
Adequacy of study:
key study
Study period:
not applicable
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
QSAR prediction: QSAR method cited as reliable in the REACH guidance
Qualifier:
no guideline followed
Principles of method if other than guideline:
not applicable. QSAR method
GLP compliance:
no
Remarks:
not applicable. QSAR method
Type of method:
other: not applicable. QSAR method
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: 1.11E-022 mm Hg is equivalent to a vapour pressure of 1.48E-020 Pa
Transition / decomposition:
no
Remarks:
no data provided in method

Selected VP: 1.11E-022 mm Hg (Modified Grain Method)

: 1.48E-020 Pa (Modified Grain Method)

 

Overview of QSARs estimations on Vapour pressure of Talc (Mg3H2(SiO3)4)

 

 

 

Method

 

Results

Remarks

Reference

QSAR estimate

Vapor Pressure Estimations (25 deg C):

 (Using BP: 751.32 deg C (estimated))

 (Using MP: 330.00 deg C (estimated))

   VP: 1.09E-034 mm Hg (Antoine Method)

     : 1.45E-032 Pa (Antoine Method)

   VP: 1.11E-022 mm Hg (Modified Grain Method)

     : 1.48E-020 Pa (Modified Grain Method)

   VP: 1.33E-017 mm Hg (Mackay Method)

     : 1.77E-015 Pa (Mackay Method)

 Selected VP: 1.11E-022 mm Hg (Modified Grain Method)

            : 1.48E-020 Pa (Modified Grain Method)

 Subcooled liquid VP: 3.16E-019 mm Hg (25 deg C, Mod-Grain method)

                    : 4.21E-017 Pa (25 deg C, Mod-Grain method)

 

Valid with restrictions (2); QSAR method;

Estimated values

MPBPWIN (v.1.43)

 

 

Conclusions:
A QSAR method predicts the vapour pressure of this substance to be  1.48E-020 Pa at 25C.
Executive summary:
A QSAR method predicts the vapour pressure of this substance to be  1.48E-020 Pa at 25C.
Endpoint:
vapour pressure
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the melting point is above 300°C
other:

Description of key information

A QSAR method predicts the vapour pressure of this substance to be  1.48E-020 Pa at 25C.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

A QSAR method predicts the vapour pressure of this substance to be  1.48E-020 Pa at 25C.

In accordance with the specific rules given in column 2 - Annex VII of REACH, this study does not need to be conducted if the melting point is >300°C. Talc (Mg3H2(SiO3)4 has an extremely high melting point (>900 Centigrade) .