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Physical & Chemical properties

Surface tension

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Endpoint:
surface tension
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because based on structure, surface activity is not expected or cannot be predicted
Endpoint:
surface tension
Type of information:
other: data from handbook
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: peer-reviewed handbook
Qualifier:
according to
Guideline:
other: no data
Deviations:
not specified
GLP compliance:
not specified
Type of method:
other: data from handbook
Surface tension:
27.87 mN/m
Temp.:
25 °C
Surface tension:
28.29
Temp.:
20 °C

The dependence of the surface tension on the temperature can be given as:

surface tension = a - b*t

where a and b are constants and t is the temperature in degrees Celsius.

Constants:

a (Octadecane) = 29.98

b (Octadecane) = 0.0843

Conclusions:
- surface tension (at 20°C) = 28.29 mN/m
- surface tension (at 25°C) = 27.87 mN/m
Executive summary:

According to Lange`s Handbook of Chemistry, the surface tension of Octadecane is:

- 28.29 mN/m (at 20°C)

- 27.87 mN/m (at 25°C).

The results were determined using the equation

surface tension = a - b * t

where a and b are constants and t is the temperature in degrees Celsius

(constants Octadecane: a = 29.98; b = 0.0843).

Description of key information

- Data Waiver: In accordance with column 2 of REACH Annex VII, a study does not need to be conducted as, based on structure, surface activity is not expected; moreover, the substance is insoluble in water (<1mg/L at 20°C).

- Supporting information: 28.29 mN/m at 20°C; 27.87 mN/m at 25°C (Lange's Handbook of Chemistry, 1999)

Key value for chemical safety assessment

Additional information

The value reported in the literature, 28.29 mN/m at 20°C, indicates that Octadecane is not a surface-active reagent. The result justifies the data waiving.