Tall-oil fatty acids oligomeric reaction products with triethylenetriamine and gylcidyl tolyl ether

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Experimental starting date: 25 July 2017 Experimental completion date: 07 February 2018

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)

Other quality assurance:

ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)

Type of method:

ring method

Specific details on test material used for the study:

Identification: Tall-oil fatty acids oligomeric reaction products with
triethylenetetramine and glycidyl tolyl ether
Short name: TOFA-TETA-CGE
CAS number: 1628940-03-3
Appearance/Physical state: dark yellow viscous liquid
Batch: Ei 4015
Purity: 100% product (UVCB)
Expiry date: 15 November 2021
Storage conditions: room temperature, in the dark

Key result

Surface tension:

63 mN/m

Temp.:

20 °C

Conc.:

90 other: % saturation of test item

On removal from the 20 °C equilibration, the samples were assessed as containing excess,

undissolved test item; Sample 1 was cloudy while Sample 2 was clear. After filtration, all the

samples were visually clear and colorless and free from excess test item.

Samples 3 and 4 were prepared due to the significant difference in results for Sample 1 and 2.

At the time of the preparation of Sample 1, it was noted that on addition of the water it turned

cloudy/hazy. Sample 2 was noted as remained clear. It was considered that during addition

of the water to Sample 1, the test item was partially dispersed. This additionally dispersed

material caused the decrease in surface tension. Samples 3 and 4 where therefore carefully

prepared and resulted in values very similar to Sample 2.

The results for Samples 2, 3 and 4 were therefore considered to be due to components that

were extracted from the test item at the slow stirring speed used.

To investigate the effect of dispersion of the test item, the remaining saturated solutions of

Sample 3 and 4 were manually shaken and sonicated (1 minute) to thoroughly disperse the

excess test item. This resulted in both becoming cloudy solutions with bubbles on the

surface. No undispersed test item remained. The samples were left overnight at ambient

temperature to settle.

The dispersed solutions were passed through a 0.45 μm filter and the cloudy filtrates were

diluted to 90% with checked, in tolerance purified water. The surface tension of these

dilutions was then measured and was 45.0 mN/m and 39.5 mN/m for samples 3 and 4

respectively. This indicated that dispersing the test item significantly reduced the surface

tension measured and confirmed why Sample 1 was low. However, the guidelines specify

that solutions should be free from excess test item. As Samples 2, 3 and 4 were visually free

from excess test item, their results will be used as the overall result. Even so, the additional

work performed on the emulsified samples provides additional information.

According to criteria stated in EC Method A.5, substances showing a surface tension lower

than 60 mN/m under the conditions of this method should be regarded as being surface

active.

Conclusions:

The surface tension at nominally 90 % saturation of test item in water has been determined to
be 63.0 ± 1.0 mN/m at 20.0 ± 0.5 ºC.

Executive summary:

Surface Tension. 63.0 ± 1.0 mN/ (90% saturated solution) at 20.0 ± 0.5 °C, using a ring

method, designed to be compatible with Method A5 Surface Tension of Commission

Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for

Testing of Chemicals, 27 July 1995.

Description of key information

The surface tension at nominally 90 % saturation of test item in water has been determined to

be 63.0 ± 1.0 mN/m at 20.0 ± 0.5 ºC.

Key value for chemical safety assessment

Surface tension:

63