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Physical & Chemical properties

Surface tension

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Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2010-10-08 to 2010-10-11
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
no
Type of method:
ring method
Surface tension:
64.56 mN/m
Temp.:
20 °C
Conc.:
90 other: % saturated aqueous solution
Remarks on result:
other: std.dev.: 0.05 mN/m

Due to the fact that the surface tension is > 60mN/m, Zincum SW/F is classified not surface-active.

Conclusions:
The surface tension of a 90 % saturated aqueous solution of ZINCUM SW/F was 64.56 mN/m (standard deviation 0.05 mN/m).
Due to the fact that the surface tension is > 60 mN/m, Zincum SW/F is classified as not surface-active substance.
Endpoint:
surface tension
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

The substance zinc didocosanoate (carbon chain length: 18-24) can be regarded as being not surface-active. The surface activity depends mainly on the chain lenghts and the water solubility of a substance which is comparable for the substances Fatty acids, C16-C18, zinc salts (64.56 mN/m ) and zinc didocosanoate.

Key value for chemical safety assessment

Additional information

A test on the surface tension according to OECD TG 115 was conducted for the substance Fatty acids, C16-C18, zinc salts (carbon chain length: 16-18), yielding a result as not surface-active substance (64.56 mN/m). Fatty acids, C16-C18, zinc salts can be regarded as not surface-active substance. The substance zinc didocosanoate (carbon chain length: 18 -24) can be regarded as being not surface-active as well, since surface activity depends mainly on the chain lenghts and the water solubility of a substance which is comparable for the substances Fatty acids, C16-C18, zinc salts and zinc didocosanoate. It can safely be assumed that this substance is not surface active. As stated in the ECHA Guidance on information requirements and chemical safety assessment, Chapter R.7a: Endpoint specific guidance, R.7.1.18.1, May 2008, p.182, 185, a low surface tension (of below 33 mN/m) is one indicator for aspiration hazard. It can safely be assumed that the surface tension effect of zinc didocosanoate is above 33 mN/m, thus further testing is not required (in accordance with Regulation (EC) 1907/2006, Annex VII, section 7.6, Column 2).