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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:
comparable to guideline study
Justification for type of information:
Data is from experimental study report
Qualifier:
according to guideline
Guideline:
other: ISO 9101:1987 Surface active agents: Determination of interfacial tension -Drop volume method
GLP compliance:
no
Type of method:
other: Drop volume method
Key result
Surface tension:
43.69 mN/m
Temp.:
20 °C
Remarks on result:
other: at 977.7 hPa

OBSERVATIONS:

S. No.

Test temperature

(°C)

Atm. Pressure

(hPa)

No. of drops of water

(n1)

1

20

977.8

63

2

20

977.7

63

3

20

977.6

63

Mean

20

977.7

63

 

Density of test chemical at 20°C : 0.9972 g/cm ³

Surface tension of water at 20°C: 72.89 dynes/cm

 

CALCULATIONS:

Surface Tension:

 

¥ʅ =ρʅ X nw X ¥w /ρw X nʅ

 

Where,                              

¥1= surface tension of test chemical

¥2 =surface tension of water

ρ1=density of test chemical

ρ2=density of water

n1= no. of drops of test chemical

n2=no. of drops of water

 

¥l=0.9972 X63     X 72.89        

      0.9982 X 105

 

¥l  =   4579.21/104.81

 

¥l   =  43.69 dynes/cm

Conclusions:
The surface tension of test chemical was determined to be 43.69 mN/m at 20°C and 977.7 hPa.
Executive summary:

Determination of the surface tension of test chemical was carried out as per the ISO 9101:1987 Surface active agents: Determination of interfacial tension -Drop volume method using stalagmometer. The experiments was performed in triplicates and the mean surface tension of test chemical was determined to be 43.69 mN/m at 20°C and 977.7 hPa.

Description of key information

Determination of the surface tension of test chemical was carried out as per the ISO 9101:1987 Surface active agents: Determination of interfacial tension -Drop volume method using stalagmometer. The experiments was performed in triplicates and the mean surface tension of test chemical was determined to be 43.69 mN/m at 20°C and 977.7 hPa.

Key value for chemical safety assessment

Surface tension:
43.69

Additional information

Determination of the surface tension of test chemical was carried out as per the ISO 9101:1987 Surface active agents: Determination of interfacial tension -Drop volume method using stalagmometer. The experiments was performed in triplicates and the mean surface tension of test chemical was determined to be 43.69 mN/m at 20°C and 977.7 hPa.