Reaction mass of oxybispropanediol and tetraglycerol and triglycerol, esterification products with lactic acid and lauric acid

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

April 12th 2021

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2021

Report date:

2021

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

Test guideline 2

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

Test material

Test material information

Constituent 1

Reference substance name:

Reaction mass of oxybispropanediol and tetraglycerol and triglycerol, esterification products with lactic acid and lauric acid

Molecular formula:

not applicable - UVCB substance

IUPAC Name:

Reaction mass of oxybispropanediol and tetraglycerol and triglycerol, esterification products with lactic acid and lauric acid

Specific details on test material used for the study:

Test item name: Finestar 2009
CAS Number: 2225876-48-0
Water solubility: soluble in water
Molecular formula: C12 H22 O8
Molecular weight: 294.30
Batch/Lot number: 3253082031
analyzed purity: 100% active
Saponification value: 45.87
Date of manufacture: August 27, 2020
Date of expiry: August 26, 2021
Appearance: Pale yellow viscous liquid
Storage temperature: Room temperature (15 to 30°C)
Storage condition: Keep away from light, moisture, and oxidizing - reducing chemicals
Storage container: Keep in original container

Results and discussion

Surface tension

Key result

Surface tension:

36.96 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Remarks on result:

other: The mean corrected surface tension (as per Harkins and Jordan)

Any other information on results incl. tables

Surface Tension of Finester 2009

Replication	Temperature (°C)	Concentration (mN/m)
1	20	38.63
2	20	38.52
3	20	39.06
4	20	38.84
5	20	38.95

Applicant's summary and conclusion

Conclusions:

Since the measured surface tension of Finester 2009 was 38.80 ± 0.22 mN/m (which is < 60 mN/m),
Finester 2009 is considered to be “Surface active in nature”, as per the guideline EC A.5.

Executive summary:

Study Guidelines
The present study was conducted according to:

EC, 2008: The Commission Regulation (EC) No 440/2008 of 30 May 2008 laying down Test Methods pursuant to Regulation (EC) No 1907/2006 of the European Parliament and of the Council on the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH), A.5. “Surface Tension”, Official Journal No L 142, 31/05/2008.

OECD, 1995: The Organisation for Economic Cooperation and Development (OECD) Guidelines for the Testing of Chemicals, OECD 115, Surface Tension of Aqueous Solutions, adopted by the Council on July 27, 1995.

Methodology-

Principle of Test Method
The surface tension is determined by ring tensiometer based on ring method. The force which is required to withdraw a horizontal suspended ring from the surface of the solution is measured. The method employed makes use of the tensiometer, which consists of mobile sample table, force-measuring system, measuring body and measurement vessel.

Description of the Apparatus
The surface tension was determined by means of commercially available surface tensiometer based on the OECD Harmonised Ring Method. The study was performed using a surface tensiometer consisting of the following elements:

Mobile Sample Table
The mobile sample table was used as a support for the measurement vessel containing the sample solution to be tested with the force measuring system, and it was mounted on a circular stand.

Force Measuring System
The force measuring system is located above the sample table. The measuring scale was available in dynes/cm with an accuracy of 0.1 dyne/cm. The observed value was reported in mN/m (1dyne/cm = 1mN/m).

Measuring Body (Ring)
The ring is made up of platinum wire of 60 mm mean circumference. The ring was suspended
horizontally from a metal pin and a wire-mounting bracket to establish the connection to the force
measuring system.

Measurement Vessel
A cylindrical glass vessel (beaker) having an internal diameter of 55 mm was used to hold the sample.

Cleaning of the Measurement Vessel
Measurement vessel (glass beaker of internal diameter 55 mm) was cleaned thoroughly and washed with chromic (chromo-sulphuric) acid for few minutes and washed subsequently with orthophosphoric acid. Then it was rinsed with tap water and finally with distilled water until a neutral reaction was obtained. The beaker was rinsed with sample solution prior to the measurement of surface tension of the sample solution.

Cleaning of the Ring
The ring was thoroughly rinsed with water to remove the impurities soluble in water. Then it was
immersed in chromic (chromo-sulphuric) acid for few minutes, washed with distilled water until a
neutral reaction was obtained and finally heated on a spirit lamp (methanolic flame).

Mounting
The apparatus was levelled by means of a spirit level on the tensiometer base by adjusting the leveling screws provided at the base of the instrument.

Zero Point Adjustment
After mounting the ring on the apparatus and prior to immersion in the liquid, the tensiometer
indication was adjusted to zero and the ring was checked for parallelism to the liquid surface.

Calibration of Apparatus [Determination of Correction Factor (Φb)]
The apparatus was calibrated using distilled water at 20 °C. Appropriate volume of distilled water was transferred into the measurement vessel of tensiometer and placed on the table-top of the tensiometer. The table-top was gradually raised until the ring just immersed below the surface of distilled water. The torque of the ring was increased gradually and evenly until the ring detached from the surface of distilled water. The maximum force (g), required to detach the ring from the surface of distilled water was recorded. The process was carried out in five replicates and the mean correction factor was calculated.

Measurement of Surface Tension
Appropriate volume of sample solution was transferred into a measurement vessel of tensiometer and placed on the table-top of the tensiometer. The table-top was gradually raised until the ring immersed below the surface of the test item solution. The torque of the ring was increased gradually and gently until the ring detached from the surface of the sample solution. The maximum force (F) required to detach the ring from the surface of the sample solution was recorded. The process was carried out in five replicates ensuring that the liquid layer remained attached to the ring before taking another replication. The experiment was carried out at 20 °C and the mean surface tension was calculated and reported along with the standard deviation and the age of the solution (time elapsed between the preparation of test item solution and measurement of surface tension).

RESULTS
Surface Tension
The surface tension of 1 g/L aqueous solution of Finester 2009 measured after 10 minutes of its
preparation was 38.63, 38.52, 39.06, 38.84, and 38.95 mN/m, at 20 °C, for replication 1, 2, 3, 4, and
5 respectively.
The mean surface tension of 1 g/L aqueous solution of Finester 2009 measured after 10 minutes of its preparation was 38.80 ± 0.22 mN/m, at 20 °C.
The mean corrected surface tension (as per Harkins and Jordan) of 1 g/L aqueous solution of Finester 2009 was 36.96 mN/m at 20 °C.