Dicyclopentyldimethoxysilane

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1995-06-16 to 1995-09-13

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

yes

Remarks:

Surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the used apparatus.

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Key result

Surface tension:

72.4 mN/m

Temp.:

20 °C

Conc.:

0.005 g/L

Table 2: Results

Solution	Mean peak height
Standard 4.91 mg/L	5.649 x10^3
Standard 4.82 mg/L	5.522 x 10^3
Sample	2.640 x 10^3

Mean sample solution concentration = 4.60 x 10^-3g/L

Table 3: Calibration

Reading (mN/m)	Temperature (°C)	Literature value	Calibration factor
72.3	20	72.75	1.006
72.5	20	72.75	1.003
72.4	20	72.75	1.005
72.2	20	72.75	1.008
72.4	20	72.75	1.005

Mean calibration factor = 1.005

Table 4: sample solution

Time (mins.)	Reading (mN/m)	Temperature (°C)
5	72.2	20
15	72.1	20
23	72.1	20
30	71.8	20
45	72.0	20

Mean reading = 72.0 mN/m

Surface tension = reading x calibration factor

                               = 72 x 1.005

                               = 72.4 mN/m

 

Conclusions:

A surface tension value of a 4.6 x 10-3 g/L solution of the substance has been determined to be 72.4 mN/m at 20 ± 0.5°C using an appropriate test method and in compliance with GLP. The result is considered reliable.

Description of key information

Surface tension: 72.4 mN/m (EU Method A.5)

Key value for chemical safety assessment

Surface tension:

72.4

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

4.6

Additional information

A measured surface tension value for a 4.6 mg/L aqueous solution (approximately 90% saturated concentration) of the test substance was determined to be 72.4 mN/m at 20 ± 5°C using an appropriate test method and in compliance with GLP. The result is considered to be reliable and is selected as key study.

In other available measured studies, surface tension values of 60.6 mN/m and 46.8 mN/m were determined for the substance using relevant test methods. However, the results were disregarded due to the use of higher loading rates of 8.1 mg/kg and 60 mg/L respectively.

Therefore, based on a measured surface tension of 72.4 mN/m; the substance is considered not surface active. This is consistent with the expectations from its chemical structure.