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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:
03 May 2018 - 05 June 2018
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:
yes (incl. QA statement)
Type of method:
OECD harmonised ring method
Specific details on test material used for the study:
- Batch: D05/38
- Expiration date: 30 August 2021
- Purity: 97.36%
- Storage condition of test material: Room temperature in the dark
Key result
Surface tension:
48.5 mN/m
Temp.:
20 °C
Conc.:
90 other: % saturated solution in water

Results

Test temperature:

20°C

Sample concentration:

90% saturated solution in water

Sample age:

Tested immediately after preparation

           

Initial values for the surface tension were obtained as soon as possible after transfer of the aqueous solution to the measurement vessel.

Time
(minutes)

Surface tension (mN/m)

Measured

Calibration corrected

A

B

A

B

 

 

 

 

 

0

49.0

49.5

49.5

50.0

5

50.5

51.0

51.0

51.5

10

50.5

50.5

51.0

51.0

15

51.0

50.5

51.5

51.0

20

51.0

50.0

51.5

50.5

25

50.5

50.5

51.0

51.0

30

51.0

50.5

51.5

51.0

 

 

 

 

 


Mean calibration corrected surface tension = 51.0 mN/m

Harkins-Jordan corrected value = 48.5 mN/m

Conclusions:
A 90% saturated solution of potassium 12-hydroxystearate in water has a surface tension of 48.5 mN/m at 20°C.
Executive summary:

The surface tension of potassium 12 -hydroxystearate was determined in a GLP-compliant study following OECD guideline 115. A 90% saturated solution of potassium 12-hydroxystearate in water has a surface tension of 48.5 mN/m at 20°C. As the surface tension of the substance is less than 60 mN/m, potassium 12 -hydroxystearate is considered to be surface active.

Description of key information

A 90% saturated solution of potassium 12-hydroxystearate in water has a surface tension of 48.5 mN/m at 20°C.

Key value for chemical safety assessment

Surface tension:
48.5
in mN/m at 20°C and concentration in mg/L:
900

Additional information

The surface tension of potassium 12 -hydroxystearate was determined in a GLP-compliant study following OECD guideline 115 (Agrochemex 2018). A 90% saturated solution of potassium 12-hydroxystearate in water (assumed to be 900 mg/L based on a water solubility value of 1000 mg/L) has a surface tension of 48.5 mN/m at 20°C. As the surface tension of the substance is less than 60 mN/m, potassium 12 -hydroxystearate is considered to be surface active.

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