Registration Dossier

Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
15 March 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
The substance can be produced through different process routes, yielding solutions in water or organic solvent (e.g. methanol or ethylene glycol).
It was initially unclear how to register the substance (mono-constituent or multi-constituent substance) and which manufactured substance to test to fulfil the REACH data requirements. After consultation with the ECHA helpdesk, the test program was started with the manufactured substance of the Lead registrant (solvent: methanol) in which the highest amount of solvent could be removed without causing degradation of the substance. This resulted in the selection of a solution of 56-57% BTMAOH in methanol as test substance.
During the course of the test program, and in order to aid meaningful risk assessment, after consultation with ECHA and upon ECHA's recommendation, it was considered to be more appropriate to test the water-based manufactured substance. As a consequence, some testing was performed with a BTMAOH solution in methanol, and some testing was performed with a BTMAOH solution in water.

The current entry reflects a test performed with a water-based test solution.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report Date:
2018

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
GLP compliance:
yes
Type of method:
OECD harmonised ring method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
liquid
Details on test material:
Appearance: Clear almost colourless liquid
Test item storage: At room temperature
Stable under storage conditions until: 30 November 2020 (expiry date)

Results and discussion

Surface tensionopen allclose all
Key result
Surface tension:
74.7 mN/m
Temp.:
20 °C
Remarks on result:
other: Conc.= 1 g/L (corrected for the water content)
Key result
Surface tension:
75.3 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Any other information on results incl. tables

Table 1: Surface tension measurements at 1 g/L (corrected for the water content)

Measurement

Time passed after transfer test solution to test vessel
[minutes]

Surface tension
(mN/m)

individual

mean (1)

mean (2)

1

15

73.4

74.01

74.7

2

16

73.8

 

 

3

17

73.9

 

 

4

18

74.3

 

 

5

19

74.2

 

 

6

20

74.0

 

 

(1) Mean calculated from measurements 2 to 6, after equilibrium was reached.

(2) Mean multiplied by the calibration factor and Harkins-Jordan corrected.

Table 2: Surface tension measurements at 1 g/L

Measurement

Time passed after transfer test solution to test vessel
[minutes]

Surface tension
(mN/m)

individual

mean

mean (1)

1

15

74.5

 

 

2

16

74.3

74.6

75.3

3

17

74.8

 

 

4

18

74.8

 

 

5

19

74.8

 

 

(1) Mean multiplied by the calibration factor and Harkins-Jordan corrected.

Applicant's summary and conclusion

Conclusions:
The surface tension of a solution of 1 g/L of Benzyltrimethylammonium hydroxide in water was determined to be 74.7 mN/m (at 20°C).
The surface tension of a solution of 0.2 g/L of Benzyltrimethylammonium hydroxide in water was determined to be 75.3 mN/m (at 20°C).
Executive summary:

The OECD harmonized ring method (EC A.5 and OECD 115) was performed (GLP-compliant study). Two test solutions were prepared from aqueous test material containing Benzyltrimethylammonium hydroxide: 1 g/L and 0.2 g/L.

The surface tension of solution of 1 g/L of Benzyltrimethylammonium hydroxide in water was determined to be 74.7 mN/m (at 20°C).

The surface tension of solution of 0.2 g/L of Benzyltrimethylammonium hydroxide in water was determined to be 75.3 mN/m (at 20°C).

According to the EC A.5 guideline Benzyltrimethylammonium hydroxide is not surface active.