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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:
test procedure in accordance with national standard methods
Justification for type of information:
Data is from experimental report
Qualifier:
according to guideline
Guideline:
other: ISO 9101:1987Surface active agents: Determination of interfacial tension -Drop volume method.
Principles of method if other than guideline:
to determine the surface tension of the test chemical
GLP compliance:
no
Type of method:
other: drop count
Key result
Surface tension:
68.99 mN/m
Temp.:
20 °C
Remarks on result:
other: Surface tension of test chemical was reported to be 68.99 mN/m

observation table -

Density of Test Chemical in g/cm³ 0.92
Surface tension of water at 20 °C 72.86
Density of water at 20 °C 0.9982

Method Details

Observations 

Remarks if, any

Atmospheric pressure(Mean)

hPa

977.4

 

No. of drops of water (nw)(Mean)

 

75

No. of drops of test chemical (nl)(Mean)

 

73

CALCULATIONS
 Surface Tension:
Where,                               
¥l= surface tension of test chemical
¥w = surface tension of water
ρl= density of test chemical
ρw =density of water
nl= no. of drops of test chemical
nw = no. of drops of water

¥l=0.92X75X72.86
         0.9982X73

¥l  =    5,027.34 / 72.87
¥l   =  68.99 dynes/cm

Conclusions:
Surface tension of test chemical was determined to be 68.99 mN/m at 20 deg c.
Executive summary:

Based on the data available from study , the surface tension of the test chemical was determined to be 68.99 mN/m at 20 deg c.

Description of key information

Based on the data available from study , the surface tension of the test chemical was determined to be 68.99 mN/m at 20 deg c.

Key value for chemical safety assessment

Surface tension:
68.99

Additional information

Based on the data available from study , the surface tension of the test chemical was determined to be 68.99 mN/m at 20 deg c.