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Physical & Chemical properties

Vapour pressure

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vapour pressure
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
August 24 - November 17, 2011
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Refer chapter 13 for the detailed structural analogue justification.
Reason / purpose for cross-reference:
read-across: supporting information
according to guideline
OECD Guideline 104 (Vapour Pressure Curve)
according to guideline
EU Method A.4 (Vapour Pressure)
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: by loss of weight or by trapping vaporisate
isothermal thermogravimetric effusion method
20 °C
Vapour pressure:
< 0.002 Pa
25 °C
Vapour pressure:
< 0.004 Pa
The vapour presure of source sunbstance 3,3 'DDS is estimated to be < 1.5.10-3 Pa at 20°C (293K) and < 4.2.10-3 Pa at 25°C (298K).
Executive summary:

A GLP compliant test was carried out with source substance 3,3 DDS according to Guideline EU method A.4: and OECD Guideline no.104. The isothermal TGA effusion method was applied for the determination of the vapour pressure of 3,3'-DDS. Its vapour pressure was < 1.5.10-3Pa at 20°C (293K) and < 4.2.10-3Pa at 25°C (298K).

No significant weight loss of the test substance was observed below the melting temperature of the test substance (i.e. a relatively low vapour pressure was obtained).

Based on ttest results, the vapour pressure for 3,3'DDS can be estimated to be < 1.5.10-3Pa at 20°C (293K) and < 4.2.10-3Pa at 25°C (298K).

Description of key information

Based on the isothermal TGA effusion method used for the read across substance (3,3'-DDS), the vapour pressure for 4,4'DDS can be estimated to be < 1.5.10-3 Pa at 20°C (293K) and < 4.2.10-3 Pa at 25°C (298K).

Key value for chemical safety assessment

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

Additional information