Cyanamide

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2007-08-14

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:

yes

Type of method:

OECD harmonised ring method

Key result

Surface tension:

72.86 mN/m

Temp.:

20 °C

Conc.:

1 g/L

The surface tension was constant during the test. The mean value was therefore calculated from the determinations obtained 1 h 15 min after the preparation and later. The age of the surface was 1 h 15 min to 1 h 35 min. The mean surface tension of the test substance was 72.86 mN/m, standard deviation 0.000, at a temperature of 20 °C.

Conclusions:

The surface tension of the test item is 72.86 mN/m. The test item is not considered as surface active as the surface tension is greater than 60 mN/m.

Executive summary:

The objective of the study was to determine the surface tension of the test substance Cyanamid F1000. The surface tension was determined by the OECD ring method with an interfacial tensiometer according to the EU method A.5 and the OECD Guideline 115. The saturation concentration of Cyanamid F1000 in water is > 1 g/L at 20 °C. According to the guidelines the surface tension was therefore determined with a solution of about 1 g/L in water. Five determinations of the Cyanamid F1000 solution were performed. The surface tension was constant during the test. The mean value was therefore calculated from the determinations obtained 1 h 15 min after the preparation and later. The age of the surface was 1 h 15 min to 1 h 35 min. The mean surface tension of the test substance was 72.86 mN/m, standard deviation 0.000, at a temperature of 20.0 °C. According to the EU directive Cyanamid F1000 is not a surface active substance because its surface tension is greater than 60 mN/m.

Description of key information

The surface tension of the test item is 72.86 mN/m. The test item is not considered as surface active as the surface tension is greater than 60 mN/m.

Key value for chemical safety assessment

Surface tension:

72.9

in mN/m at 20°C and concentration in mg/L:

1 000

Additional information

The surface tension of Cyanamid F1000 was determined by the OECD ring method with an interfacial tensiometer according to the EU method A.5 and the OECD Guideline 115. Five determinations of the Cyanamid F1000 solution were performed. The surface tension was constant during the tests. The mean value was therefore calculated from the determinations obtained 1 h 15 min after the preparation and later. The age of the surface was 1 h 15 min to 1 h 35 min. The mean surface tension of the test substance was 72.86 mN/m, standard deviation 0.000, at a temperature of 20.0 °C. According to the EU directive Cyanamid F1000 is not a surface active substance because its surface tension is greater than 60 mN/m.

Another two studies determined the surface tension of Cyanamid L500 (solution of 50.2% cyanamide). The concentration of cyanamide in the study of Wenighofer was around 1 g/L which is the same concentration that was used in the study with Cyanamid F1000, therefore the two studies are compatible. The resulted mean surface tension was 72.75 mN/m. The result of the second supporting study that was performed with Cyanamid L500 in a concentration of 50.1 % was 62.5 mN/m. Following the key study, it can be concluded that Cyanamid F1000 is not a surface active substance because its surface tension is greater than 60 mN/m.