Benzyltrimethylammonium hydroxide

Flash point

Link to relevant study record(s)

Reference

Endpoint:

flash point of flammable liquids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 13 April 2018 to 09 May 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

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 methanol-based test solution.

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.9 (Flash-Point)

Version / remarks:

2016

Qualifier:

according to guideline

Guideline:

other: ASTM D7094: “Standard Test Method for Flash Point by Modified Continuously Closed Cup (MCCCFP) Tester”

Version / remarks:

2012

Deviations:

no

Qualifier:

according to guideline

Guideline:

ISO 2719 (Determination of flash point - Pensky-Martens closed cup method)

Version / remarks:

2002

Deviations:

yes

Remarks:

see field below

Principles of method if other than guideline:

remark of reviewer:
Several non-equilibrium methods are mentioned in the EC A.9 guideline. According to the study report the study was performed according to ISO Guide 2719 (Pensky-Martens closed cup). However, from the description of the test performance and the flash-point tester it was concluded that ASTM D7094 (modified continuously closed cup) is more applicable. ASTM D7094 is not mentioned in the EC A.9 guideline but is a commonly used and safer (low sample volume) alternative for the ISO 2719 method.

GLP compliance:

yes

Type of method:

non-equilibrium method closed cup

Flash point apparatus:

other: Eraflash (Eralytics, Austria)

Dynamic viscosity of test material:

-

Key result

Remarks on result:

other: no flash point up to possible reaction/decomposition at 94°C

Interpretation of results:

other: not classified under CLP or GHS

Conclusions:

The tested BTMAOH solution in methanol has no flash point.

Executive summary:

The modified continuously closed cup ASTM D7094 method (GLP study) was performed. A solution of Benzyltrimethylammonium hydroxide in methanol was tested. No flash-point was observed below the temperature at which reaction and/or degradation was observed (i.e at ca 94°C). Thus the tested solution has no flash point. However, this conclusion may not be applicable to test solutions containing a higher percentage of methanol.  

Description of key information

For the registered substance BTMAOH, the flash point is not a relevant parameter as it is a solid.

Additional information

Using the modified continuously closed cup ASTM D7094 method, it was determined that a solution of 56-57% BTMAOH in methanol has no flash point. However, this conclusion may not be applicable to solutions containing a higher percentage of methanol (classified as flammable).