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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
March 7, 2005
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
According to OECD Guideline 115, with GLP.
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
Type of method:
ring method
Key result
Surface tension:
65.643 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: Standard deviation: 0.076

The test substance is composed of several compounds, including the 3 main components MMAC2, MAC3 and MM2AC. The 3 components act uniformly as hardeners for silicone sealing masses. They polymerise, triggered by hydrolysis. The test substance degrades rapidly with a half-life time of <1 hour at 25 °C. Therefore the surface tension of the degradation products of the test substance was determined.

Surface tension of water:

tensiometer readings (mN/m)

mean (mN/m)

calculated

71.5

 

71.5

 

1.017

71.6

71.5

Surface tension of the test substance solution


determination

age of the surface of the test substance solution
(h:min)


tensiometer readings (mN/m)


experimental value (mN/m)


surface tension (mN/m)

1

02:00

64.9

66.00

65.55

2

02:30

65.0

66.11

65.66

3

05:50

65.0

66.11

65.66

4

04:00

65.1

66.21

65.77

5

04:15

65.0

66.11

65.66

6

04:30

64.9

66.00

65.55

7

04:45

65.0

66.11

65.55

 

 

mean of determinations

65.64

 

 

SD

0.076

Conclusions:
The mean surface tension of the degradation products of the test substance was 65.643 mN/rn, standard deviation 0.076, at a temperature of 20.0 °C.
Executive summary:

The Surface Tension assay performed according to OECD guideline 115 (ring method) on Wasox-MMAC2 shows that the mean surface tension of the degradation products of the test substance is 65.643 mN/m at a temperature of 20.0 °C.

Description of key information

Key study: OECD Guideline 115 and GLP. The mean surface tension of the degradation products of the test substance Wasox-MMAC2 is 65.643 mN/m at a temperature of 20.0 °C.

Key value for chemical safety assessment

Surface tension:
65.643
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

Key study: The Surface Tension assay performed according to OECD guideline 115 (ring method) and GLP with test item Wasox-MMAC2 shows that the mean surface tension of the degradation products of the test substance is 65.643 mN/m at a temperature of 20.0 °C.