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Physical & Chemical properties

Surface tension

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Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From March 18, 1989 to July 26, 1989
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1989
Report Date:
1989

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes
Type of method:
other: calibrated torsion balance

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid

Results and discussion

Surface tensionopen allclose all
Key result
Surface tension:
50.1 mN/m
Temp.:
22.7 °C
Conc.:
1.1 other: % w/v
Remarks on result:
other: Arithmetic mean of 6 readings
Key result
Surface tension:
65.2 mN/m
Temp.:
23.4 °C
Conc.:
0.11 other: % w/v
Remarks on result:
other: Arithmetic mean of 7 readings

Any other information on results incl. tables

Readings: 1.1% w/v Solution 

Arithmetic mean = 50.4 mN m(-1) at 22.7°C (average of last 6 readings).

Calibration factor = 0.994

Corrected mean = 50.1 mN m(-1) at 22.7°C


Readings: 0.11% w/v Solution 

Arithmetic mean = 65.6 mN m(-1) at 23.4°C (average of last 7 readings).

Calibration factor = 0.994

Corrected mean = 65.2 mN m(-1) at 23.4°C

Reading: 0.11% w/v solution

Time (min.sec) Observed Reading [mN m(-1)] Temperature (°C)
8.44 66.7 23.0
12.50 65.8 23.0
15.47 65.8 23.5
19.17 65.6 23.5
21.46 65.5 23.5
23.59 65.5 23.5
25.55 65.4 23.5
27.52 65.4 23.5

Reading: 1.1% w/v solution

Time (min.sec) Observed Reading [mN m(-1)] Temperature (°C)
5.40 53.3 21.0
12.35 52.8 21.0
17.02 52.1 21.0
21.15 52.0 21.0
28.22 50.6 22.0
31.55 50.7 22.0
34.44 50.6 23.0
40.04 50.3 23.0
43.33 50.2 23.0
46.19 50.2 23.0

Applicant's summary and conclusion

Conclusions:
Under the study conditions, surface tension of the test substance, solution in distilled water was determined to be 50.1 mN/m at 22.7°C (1.1% w/v solution); 65.2 mN/m at 23.4°C (0.11% w/v solution). The substance is considered to have surface-active properties.
Executive summary:

A study was conducted to determine the surface tension of the test substance, according to EU Method A.5. Under the study conditions, surface tension of the test substance, solution in distilled water was determined to be 50.1 mN/m at 22.7°C (1.1% w/v solution); 65.2 mN/m at 23.4°C (0.11% w/v solution) (Williams, 1989).