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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
no
Type of method:
ring method
Specific details on test material used for the study:
Product description: Potassium isooctadecanoate/potassium isostearate
Name: Isooctadecanoic acid, potassium salt
CAS No.: 66469-15-6
Physical state: off white to yellowish solid at 20 °C
Batch No.: PFS-755-169
Re-certification date of batch: 12 December 2017
Purity: 100 % (UVCB)
pH, 10% in DI water 8.0 - 9.0
Stability: stable under test conditions
Storage condition of test material: Room temperature, protected from light
Key result
Surface tension:
25.3 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Water calibration:    

Temp. = 21 °C

Density  = 0.998 g/cm3

Arithmetic mean 71.5 mN/m, standard deviation 0.1 mN/m from 6 measurements (theoretical value: 72.4 mN/m -> correction factor 1.0126).

First test solution:       

c = 1058 mg/l

Temp. = 21 °C

Density = 0.998 g/cm3,

Age of the solution: 115 min

Arithmetic mean 25.0 mN/m, standard deviation 0.1 mN/m from 6 measurements.

Second test solution:     

c = 957 mg/l

Temp. = 21 °C

Density = 0.998 g/cm3

Age of the solution: 207 min

Arithmetic mean 25.0 mN/m, standard deviation 0.0 mN/m from 6 measurements

Conclusions:
The test item has a surface tension of 25.3 mN/m (c=approx. 1 g/l) in accordance with the test method EU A.5. "Surface Tension".
Executive summary:

The test item has a surface tension of 25.3 mN/m (c=approx. 1 g/l) in accordance with the test method A.5. "Surface Tension" as described in the Commission Regulation (EC) No 440/2008 laying down test methods pursuant Regulation (EC) No 1907/2006 of the European Parliament and of the Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), also similar to OECD guideline for testing of chemicals OECD 115.

Description of key information

The test item has a surface tension of 25.3 mN/m (c=approx. 1 g/l) in accordance with the test method EU A.5. "Surface Tension".

Key value for chemical safety assessment

Surface tension:
25.3
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

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