Fatty acids, lanolin, lithium salts

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

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 (incl. QA statement)

Type of method:

OECD harmonised ring method

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: SOAP012-2
- Expiration date of the lot/batch: 1 November 2022


STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Ambient

Surface tension:

35 mN/m

Temp.:

20 °C

Conc.:

90 vol%

The measurements were conducted immediately after the final test solution preparation.

Table 1. Results of the surface tension test with the test item.

Time	Surface tension (mN/m)
(minutes)	Measured		Calibration corrected
	A	B	A	B
0	36.0	37.0	36.5	37.5
5	37.0	38.0	37.5	38.5
10	36.5	38.0	37.0	38.5
15	37.0	39.0	37.5	39.5
20	37.0	38.5	37.5	39.0
25	38.0	39.0	38.5	39.5
30	37.0	38.0	37.5	38.5

                                                 

From the measurements, it was observed that there was no significant change in surface tension readings on transfer to the measurement vessel.

Mean calibration corrected surface tension = 38.0 mN/m

Harkins-Jordan corrected value = 35.0 mN/m

Conclusions:

The surface tension of fatty acids lanolin lithium salts was determined to be 35.0 mN/m. The test item was considered to be surface active.

Executive summary:

A study to determine the surface tension of fatty acids lanolin lithium salts was conducted according to the OECD guideline 115 (Dunning 2018). The surface tension was determined at 20°C with a surface tension torsion balance using the OECD harmonised ring method.

The surface tension of a 90% saturated solution of the test item was determined to be 35 mN/m. As the result was less than 60 mN/m, the test item was considered to be surface active.

The study is GLP-compliant and was conducted according to the standard guideline, therefore is considered reliable without restrictions and suitable as a key study for this endpoint.

Description of key information

The surface tension of the test item was determined to be 35.0 mN/m. As the result was less than 60 mN/m, the test item was considered to be surface active.

Key value for chemical safety assessment

Surface tension:

35

Additional information

The surface tension of fatty acids lanolin lithium salts was determined in a study according to the OECD 115 guideline (Dunning 2018). The surface tension was determined at 20°C with a surface tension torsion balance using the OECD harmonised ring method.

The surface tension of a 90% saturated solution of the test item was determined to be 35.0 mN/m. As the result was less than 60 mN/m, the test item was considered to be surface active.

The study is GLP-compliant and was conducted according to the standard guideline, therefore is considered reliable without restrictions and suitable as a key study for this endpoint.