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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Physical & Chemical properties

Surface tension

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Administrative data

Link to relevant study record(s)

surface tension
Type of information:
experimental study
Adequacy of study:
key study
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
GLP compliance:
Type of method:
ring method
Surface tension:
71.3 mN/m
20 °C
1.055 other: g/L (given as sodium 2-biphenylate tetrahydrate)
Remarks on result:
other: not surface active

Time passed between preparation and the first measurement: 25 minutes

Surface tension:


 Time expired*


 measured surface tension


 1  15  71.9
 2  16  72.0
 3  17  71.9
 4  18  72.1
 5  19  72.0

* Time passed since the solution was transferred to the measurement vessel

mean surface tension, not corrected: 72.0 mN/m

mean surface tension, corrected for calibration: 71.3 mN/m

mean surface tension corrected using Harkins&Jordan, 1930: 71.3 mN/m

calibration factor: 0.990


Description of key information

not surface active

(EU Method A.5)

Key value for chemical safety assessment

Surface tension:
in mN/m at 20°C and concentration in mg/L:
1 055

Additional information

(concentration given as sodium 2-biphenylate tetrahydrate)