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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
The OECD guideline refers to ISO Standard 304-1985 as a suitable method to follow.
Deviations:
yes
Remarks:
The OECD Guideline recommends double-distilled water. However, the ISO method it refers to states that one only needs to report the type of water used.
Principles of method if other than guideline:
The glassware and ring were cleaned in dilute sulfuric acid solution, water rinsed, and then flamed using a propane gas torch to remove any organic residue. The platinum ring was flamed to a bright orange color before each measurement. The method of cleaning used is satisfactory given the nature of the test solutions.
The cleaning process is slightly different from both the ISO and OECD Guideline. The ISO method reference calls for concentrated sulfuric acid followed by water and no flame. The OECD Guideline calls for chromo-sulfuric acid, followed by distilled water, and then methanol flame.
GLP compliance:
not specified
Type of method:
ring method
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%
Surface tension:
44.5 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: shows no signs of time dependency

Surface Tension of test solution #1 (mN/m)

Surface Tension of test solution #2 (mN/m)

Equilibrium Time from time of preparation

44.5

44.5

4 hours

44.6

44.5

4 hours, 5 minutes

44.5

44.6

4.5 hours

44.5

44.5

4.5 hours

Conclusions:
The surface tension at 20.0°C is 44.5 mN/m
Executive summary:

The surface tension of the test substance was measured at 1 g/L concentration in water. The surface tension at 20.0°C is 44.5 mN/m and shows no signs of time dependency.   

Description of key information

The surface tension at 20.0°C is 44.5 mN/m and shows no signs of time dependency.

Key value for chemical safety assessment

Surface tension:
44.5
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information