Cyclohexyldimethoxymethylsilane

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:

70.3 mN/m

Temp.:

19.5 °C

Conc.:

0.02 g/L

Table 2: Results

Solution	Mean peak height
Standard 53.6 mg/l	2.285 x10^3
Standard 52.3 mg/l	2.158 x 10^3
Sample	422

Mean sample solution concentration = 2.01 x 10^-2 g/L

Table 3: Calibration

Reading (mN/m)	Temperature (°C)	Literature value	Calibration factor
72.7	19.5	72.83	1.002
72.7	19.5	72.83	1.002
72.6	19.5	72.83	1.003
72.5	19.5	72.83	1.005
73.0	19.5	72.83	0.998
72.6	19.5	72.83	1.003
72.7	19.5	72.83	1.002
72.2	19.5	72.83	1.009
72.6	19.5	72.83	1.003

Mean calibration factor = 1.003

Table 4: sample solution

Time (mins.)	Reading (mN/m)	Temperature (°C)
0	67.2	19.5
10	68.5	19.5
20	69.6	19.5
30	69.6	19.5
40	69.9	19.5
50	70.0	19.5
55	70.0	19.5
65	70.3	19.5
75	70.0	19.5

Mean of final 5 readings = 70.04 mN/m

Surface tension = reading x calibration factor

                               = 70.04 x 1.003

                               = 70.3 mN/m

 

Conclusions:

A surface tension value of a 2.01 x 10-2 g/L solution of the substance has been determined to be 70.3 mN/m at 19.5 ± 0.5°C using an appropriate test method and in compliance with GLP. The result is considered reliable.

Description of key information

Surface tension: 70.3 mN/m at 19.5°C (EU Method A.5)

Key value for chemical safety assessment

Surface tension:

70.3

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

19.5

Additional information

A measured surface tension value for a 20.1 mg/L solution of the submission substance was determined to be 70.3 mN/m at 19.5 ± 5°C. Under the conditions of the test, the substance is not surface active.

A surface tension value of 58.3 mN/m was also determined for the submission substance in a study which has been disregarded because the study is believed to have been conducted using a saturated solution above the solubility of the substance. In addition, the duration of the solution preparation also means that polymerisation could have occurred.

In contact with water, the submission substance hydrolyses moderately rapidly to form cyclohexylmethylsilanediol and methanol. The silanol hydrolysis product is not expected to be surface active.