Fatty acids, C14-18 and C16-18-unsatd., zinc salts

Surface tension

Link to relevant study record(s)

Reference

Reference 1

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)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

2008

Deviations:

no

GLP compliance:

no

Type of method:

ring method

Specific details on test material used for the study:

- Test item: Zincum SW/F
- Physical state: whitely powder
- Water solubility: 0.3 - 1.8 mg/L (depending on test conditions)
- Storage conditions: Room temperature, protected from moisture and light

Surface tension:

64.56 mN/m

Temp.:

20 °C

Conc.:

90 other: % saturated aqueous solution

Remarks on result:

other: standard deviation: 0.05 mN/m

Due to the fact that the surface tension is > 60 mN/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.

Reference 2

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

Reference 3

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

2018-02-12 to 2018-02-13

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)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2017-02-28

Type of method:

ring method

Surface tension:

66.87 mN/m

Temp.:

20 °C

Conc.:

90 vol%

Remarks on result:

other: 90 vol % saturated solution

Measured surface tension values

Value No.	1^stMeasurement (20 min after preparing the solution) σ [mN/m]	2^ndMeasurement (35 min after preparing the solution) σ [mN/m]
1	66.07	67.81
2	66.04	67.78
3	66.01	67.75
4	65.98	67.72
5	65.96	67.70
6	65.94	67.68
Mean value of the individual values	66.00 ± 0.05	67.74 ± 0.05
Total mean value	66.87 ± 1.23

The test item has a mean surface tension of 66.87 mN/m. Thus, the test item is not to be regarded as surface active according to regulation EC No. 440/2008 Part A Method A.5.

Conclusions:

According to OECD Test Guideline 115 (1995) and Regulation EC No. 440/2008 Part A Method A.5. the surface tension at 20 °C of test item zinc ditetradecanoate was determined to be: σ = 66.87 mN/m. Therefore, the test item is not to be regarded as surface active material.

Description of key information

In accordance with Regulation (EC) No 1907/2006, Annex VII, Section 7.6, column 2, the study need only be conducted if, based on structure, surface activity is expected or can be predicted. However, studies with Fatty acids, C16-18, zinc salts and Zinc ditetradecanoate (C14) were performed according to OECD 115 (see supporting robust study summaries section 4.10) resulting in no surface-active properties, i.e., 64.56 mN/m at 20 °C and 66.87 mN/m at 20 °C, respectively. A similar behaviour is assumed for "Fatty acids, C14-18 and C16-18-unsatd., zinc salts". Therefore, a test does not need to be conducted.