N,N'-(ethoxymethylsilylene)bis[N-methylbenzamide]

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

January 24, 2017 - January 25, 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

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

Specific details on test material used for the study:

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: room temperature.

Key result

Surface tension:

ca. 27.4 mN/m

Temp.:

20 °C

Conc.:

30 other: mL of test item

The results of the tensiometer calibration and surface tension measurement are presented in Tables 1 and 2.

Table 1. The calibration using deionised water at 20.0°C

 

n^oof measurement	1	2	3	4
water surface tension value, mN/m	70.4	70.5	70.5	70.4

The determined average value of deionised water the surface tension is: 70.45± 0.06 mN/m

The calibration factor Φ_bcalculated from equation:                       

Φ_b=σ_o/ σ_g= 72.75 / 70.45 = 1.03

                      

              Table 2. Measurement ofsurface tension

N,N'-(ethoxymethylsilylene)bis[N-methylbenzamide] at 20°C.

 

Measurement N^o	1	2	3	4	5
time of test item transfer to measurement vessel, min	10	25	40	50	65
test item surface tension, mN/m	28.5	28.4	28.6	28.4	28.4

 

The average value of test item surface tension is: 28.46 ± 0.09 mN/m.

 

No distinct dependence of measured values on the surface tension during the transfer time was observed.

The measured surface tension value should be corrected by multiplying by the calibration factor F_b= 1.03 (calculated before).

Preliminary corrected value =F_b´28.46 = 1.03´28.46 = 29.31 mN/m

On the base of the polynomial equation the finally corrected value of test item surface tension is:

           σ= -1.183 + 0.946 · 29.31+ 9.927 ·10^-4· (29.31)²= 27.4 mN/m

Conclusions:

The evaluated, after corrections at 20 ºC the value of the test item surface tension was 27.4 mN/m.

Executive summary:

 The determination of surface tension was performed according to OECD 115 and EU method A.5 (OECD harmonized ring method) using a tensiometer Krüss K8600, following GLP. 30 mL of test item was transferred to a vessel which was placed in the apparatus, then a ring was immersed. The maximum force required to detach the ring from the liquid surface was recorded for each determination. The surface tension (after corrections) of the test item at 20ºC was 27.4 mN/m.

Description of key information

Key study: OECD 115 and EU method A.5. GLP study. The evaluated, after corrections at 20 ºC the value of the test item surface tension was 27.4 mN/m.

Key value for chemical safety assessment

Surface tension:

27.4

Additional information

Key study: The determination of surface tension was performed according to OECD 115 and EU method A.5 (OECD harmonized ring method) using a tensiometer Krüss K8600, following GLP. 30 mL of test item was transferred to a vessel which was placed in the apparatus, then a ring was immersed. The maximum force required to detach the ring from the liquid surface was recorded for each determination. The surface tension (after corrections) of the test item at 20ºC was 27.4 mN/m.