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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Surface tension

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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
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).

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

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.