2-methylpentyl 2-hydroxybenzoate

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

25-03-2020 to 28-08-2020

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Guideline study performed under GLP. All relevant validity criteria were met.

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

GLP compliance:

yes

Type of method:

ring method

Key result

Surface tension:

61.53 mN/m

Temp.:

20 °C

Conc.:

90 vol%

Remarks on result:

other: mean determined surface tension and with Harkins-Jordan correction

Table 1. Surface Tension of the Test Item

Measurement	Time passed after measurement start [seconds]	Surface tension (mN/m)
		individual σ multiplied by Harkins-Jordan corrected value	mean σ
1	37	61.62	61.53
2	63	61.50
3	89	61.51
4	116	61.50
5	143	61.50

Conclusions:

The surface tension of a test solution at 90% saturation of the test item in double distilled water was determined to be 61.53 mN/m at 19.8 ± 0.5 °C. The test item is not considered to be surface active.

Executive summary:

The surface tension of the test item at 90% saturation solubility in double distilled water was determined using the ring method of EU Method A.5 and OECD TG 115 under GLP. The system consists of the following elements: model K11 tensiometer (Krüss, Germany), platinum-iridium ring with a wire radius of 0.185 mm and a ring radius of 9.545 mm and a cylindrical glass vessel with an inside diameter of 45 mm. The instrument is equipped with a high-precision force sensor that, apart from installation or servicing does not have to be recalibrated. The instrument is periodically checked for performance against reference standards indicated in OECD TG 115 and/or relevant international and national standards. All glassware was washed with hot chromosulphuric acid and subsequently with syrupy phosphoric acid, thoroughly rinsed in tap water and finally washed with double distilled water. The platinum-iridium ring was rinsed thoroughly in water, briefly immersed in chromosulphuric acid, washed with double distilled water and finally heated briefly above a methanol flame. An aliquot of 200 mg of the test item was stirred with 200 mL double distilled water at 19.8 ± 0.5°C for 20 hours. In order to remove test item particles floating on the surface of the test sample, the upper layer was removed by suction using a water aspirator pump. Thereafter, 90 mL of the aqueous phase was mixed with 10 mL double distilled water to obtain the test solution at 90% of the test item saturation solubility in water. The cylindrical glass vessel was filled with water or test solution and placed in a vessel holder on a mobile sample table. The time between preparation of the test solution and transferring it to the vessel was 3 minutes. Harkins and Jordan correction was automatically applied by the model K11 tensiometer. The test was performed at 19.8 ± 0.5°C. Substances showing a surface tension lower than 60 mN/m under the conditions of this method, should be regarded as being surface active. The surface tension of a test solution at 90% of the test item saturation solubility in water and at 20°C was 61.53 mN/m. Under the conditions of this study, the surface tension was ≥ 60 mN/m and therefore the test item is not considered to be surface active.

Description of key information

Surface Tension: 61.53 mN/m at 19.8 ± 0.5 °C at 90% saturation solubility, EU Method A.5, 2020

The substance is not considered to be surface active.

Key value for chemical safety assessment

Surface tension:

61.53

Additional information

Key study : EU Method A.5, 2020 : The surface tension of the test item at 90% saturation solubility in double distilled water was determined using the ring method of EU Method A.5 and OECD TG 115 under GLP. The system consists of the following elements: model K11 tensiometer (Krüss, Germany), platinum-iridium ring with a wire radius of 0.185 mm and a ring radius of 9.545 mm and a cylindrical glass vessel with an inside diameter of 45 mm. The instrument is equipped with a high-precision force sensor that, apart from installation or servicing does not have to be recalibrated. The instrument is periodically checked for performance against reference standards indicated in OECD TG 115 and/or relevant international and national standards. All glassware was washed with hot chromosulphuric acid and subsequently with syrupy phosphoric acid, thoroughly rinsed in tap water and finally washed with double distilled water. The platinum-iridium ring was rinsed thoroughly in water, briefly immersed in chromosulphuric acid, washed with double distilled water and finally heated briefly above a methanol flame. An aliquot of 200 mg of the test item was stirred with 200 mL double distilled water at 19.8 ± 0.5°C for 20 hours. In order to remove test item particles floating on the surface of the test sample, the upper layer was removed by suction using a water aspirator pump. Thereafter, 90 mL of the aqueous phase was mixed with 10 mL double distilled water to obtain the test solution at 90% of the test item saturation solubility in water. The cylindrical glass vessel was filled with water or test solution and placed in a vessel holder on a mobile sample table. The time between preparation of the test solution and transferring it to the vessel was 3 minutes. Harkins and Jordan correction was automatically applied by the model K11 tensiometer. The test was performed at 19.8 ± 0.5°C. Substances showing a surface tension lower than 60 mN/m under the conditions of this method, should be regarded as being surface active. The surface tension of a test solution at 90% of the test item saturation solubility in water and at 20°C was 61.53 mN/m. Under the conditions of this study, the surface tension was ≥ 60 mN/m and therefore the test item is not considered to be surface active.