Fatty acids, C18-unsatd., reaction products with acrylic acid and polyethylenepolyamines

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03 June 2010 - 31 August 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: This study was conducted in accordance with international guidelines in a GLP testing laboratory.

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

yes

Remarks:

Refer to "Principles of method if other than guideline"

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

yes

Remarks:

Refer to "Principles of method if other than guideline"

Principles of method if other than guideline:

The determination was carried out using a White Electrical Institute interfacial tension balance and a procedure based on the ISO 304 ring method. With the exception of the following deviation, the experimental procedure was designed to be compatible with that specified in Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for the Testing of Chemicals, 27 July 1995.
Deviation - The surface tension result was not corrected using the Harkins-Jordan correction table as the correction in not applicable to the apparatus used. Once calibrated, the balance and ring assembly used in the test give a direct reading for surface tension that is within the required accuracy (+/- 0.5mN/m); this is as a result of the reduced ring dimensions. This deviation has been considered not to have affected the integrity of the study.

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Key result

Surface tension:

66.2 mN/m

Temp.:

20 °C

Conc.:

1.05 g/L

Results

Calibration Factor (theta) - The readings and corresponding calibration factors for glass double-distilled water are shown in the following table:

Reading (mN/m)	Temperature (^oC)	Literature Value (mN/m)	Calibration Factor
73.0	20.0	72.72	0.996
73.0	20.0	72.72	0.996
73.0	20.0	72.72	0.996
73.0	20.0	72.72	0.996
73.0	20.0	72.72	0.996
73.0	20.0	72.72	0.996
73.0	20.0	72.72	0.996
Mean Calibration Factor = 0.996

Sample Solution readings

Time (mins)	Reading (mNm)	Temperature (°C)
87	65.5	20.0
95	66.5	20.0
100	66.5	20.0
144	66.5	20.0
151	66.5	20.0
161	66.5	20.0

Temperature : 20.0 +/- 0.5 °C

pH of sample solution : 4.96

Mean reading (last 5) : 66.5 mN/m

Surface tension = reading x calibration factor

= 66.5 x 0.996

= 66.2 mN/m

Conclusions:

The surface tension of a 1.05g/L solution of test item has been determined to be 66.2mN/m at 20.0 +/- 0.5°C. The test item is considered not to be surface-active.

Executive summary:

The surface tension of the test substance (PR-4758) was measured based on international guidelines in a GLP testing laboratory, and the surface tension of a 1.05 g/L solution of test item was determined to be 66.2mN/m at 20.0 +/- 0.5 °C. The test item was therefore considered not to be surface-active.

Description of key information

Surface tension of 1.05 g/L solution = 66.2 mN/m at 20 °C; OECD guideline 115; Butler & White (2010).

Key value for chemical safety assessment

Surface tension:

66.2

in mN/m at 20°C and concentration in mg/L:

1 050

Additional information

One key study is available on the surface tension of PR-4758. The study was conducted in accordance with OECD guidelines and in accordance with GLP. The surface tension results indicate that the substance is not considered to be surface active. However, the endpoint value is close to the so called surface activity trigger (60 mN/m), and as the value is representative of a UVCB it should be treated with some caution. Based on the structure of the know constituents of the substance, it is likely to display surface active properties.