[No public or meaningful name is available]

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03/AUG/04 - 26/OCT/04

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2004

Report date:

2004

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

yes

Remarks:

Temperature of test solution for test 2 was out of range. Because the measurements for the test solution were started without a previous equilibration period, the temperature of the test solution was not yet in equilibration with the water bath used.

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

yes

Remarks:

Temperature of test solution of test 2 was out of range. Because the measurements for the test solution were started without a previous equilibration period, the temperature of the test solution was not yet in equilibration with the water bath used.

GLP compliance:

yes

Type of method:

ring method

Test material

Test material information

Constituent 1

Reference substance name:

1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether

EC Number:

609-858-6

Cas Number:

406-78-0

Molecular formula:

C4H3F7O

IUPAC Name:

1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether

Test material form:

liquid

Specific details on test material used for the study:

Asahiklin AE-3000, molecular weight 200.07
CAS 406-78-0
Clear colourless liquid
Batch 50407070
Purity: 99.985%
The test substance was stored in a refrigerator in the dark under stable conditions
The test substance expiry date was the 07 July 2005

Results and discussion

Surface tension

Surface tension 1

Key result

Surface tension:

71 mN/m

Temp.:

20 °C

Conc.:

560 mg/L

Surface tension 2

Key result

Surface tension:

72 mN/m

Temp.:

21.5 °C

Conc.:

560 mg/L

Any other information on results incl. tables

In order to calculate the surface tension, the value from the apparatus was multiplied by the calibration factor. Determination of the calibration factor was as follows:

Φ_b= σ_o/ σ_g

Where:

σ_{o = surface temperature of water at the test temperature cited in the literature}

σ_{g = measured surface tension of the water at the test temperature}

Surface tension of water at 20°C (Test 1)

Measurement	Time expired (minutes)	Surface tension (mN/m)
		Measured	Mean σg
1	30	71.9	71.9
2	31	71.8
3	32	71.8
4	33	71.8
5	34	72.0

σ_o= 72.59 mN/m (at 20.0°C)

Φ_b= σ_o/σ_g=1.010

Surface tension of water at 20°C (Test 1)

Measurement	Time expired (minutes)	Surface tension (mN/m)
		Measured	Mean σg
1	20	70.8	71.4
2	21	71.4
3	22	71.3
4	23	71.4
5	24	71.4
6	25	71.5

 

σ_o= 72.59 mN/m (at 20.0°C)

Φ_b= σ_o/σ_g=1.017

However, this only yielded approx. results and required additional correction using a table compiled on the basis of the Harkins-Jordan correction (see table below):

Experimental value (mN/m)	Corrected value (water calibration) (mN/m)	Experimental value (mN/m)	Corrected value (water calibration) (mN/m)
20	18.1	50	48.6
22	20.1	52	50.7
24	22.1	54	52.8
26	24.1	56	54.9
28	26.1	58	57.0
30	28.1	60	59.1
32	30.1	62	61.3
34	32.1	64	63.4
36	34.1	66	65.5
38	36.1	68	67.7
40	38.2	70	69.9
42	40.3	72	72.0
44	42.3	74	-
46	44.4	76	-
48	46.5	78	-

 

The tables below show the individual measurements and the corrected surface tensions for the test solutions prepared in tests 1 and 2. The temperatures of the test solutions were 20.0°C and 12.0 -21.5°C respectively. GC analysis showed that the test solution of test 2 contained approx. 560mg/L of test substance after the last measurement. This meant that the aqueous test solution still contained a large amount of test substance during the measurements.

Surface tension of an aqueous solution (Test 1):

Measurement	Time expired (minutes)	Surface tension (mN/m)
		Measured	Mean not corrected	Mean corrected for calibration	Mean corrected using Harkibs and Jordan
1	48	70.8	70.9	71.6	71.2
2	49	70.7
3	50	71.0
4	51	71.1
5	52	71.0

 

Surface tension of an aqueous solution (Test 2):

Measurement	Time expired (minutes)	Surface tension (mN/m)
		Measured	Mean not corrected	Mean corrected for calibration	Mean corrected using Harkibs and Jordan
1	1	71.1	71.1	72.3	72.3
2	2	71.1
3	3	71.0
4	4	71.1
5	5	71.1

 

Applicant's summary and conclusion

Conclusions:

In conclusion, the surface tension test result of test 1 was 71mN/m (20.0°C) and the surface tension test result of test 2 was 72mN/m (21.0-21.5°C).
Therefore, according to the criteria as outlined in the EEC guideline, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether is not surface active (substances showing a surface tension lower than 60mN/m under the conditions of this method should be regarded as surface active materials).

Executive summary:

An experiment was carried out to determine the surface tension of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether. In order to do this, the ring method was used and measurements were repeated until a constant surface tension value was reached. Two tests were carried out; the first following usual protocol and the second taking utmost care to minimise evaporation of the test substance, which would affect the values obtained. In order to calculate the surface tension, the value read on the apparatus was multiplied by the calibration factor Φb. However, this yielded only an approximate value, which was then corrected for using a table compiled on the basis of Harkins-Jordan corrected. Based on this correction, the surface tension of test 1 was determined to be 71mN/m (20.0°C) and the surface tension test result of test 2 was determined to be 72mN/m (21.0-21.5°C). Therefore, according to the criteria as outlined in the EEC guideline, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether is not surface active