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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Density

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
relative density
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:
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 methanol-based test solution.
Qualifier:
according to guideline
Guideline:
EU Method A.3 (Relative Density)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Version / remarks:
2012
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7300 (Density / Relative Density / Bulk Density)
Version / remarks:
2002
Deviations:
no
GLP compliance:
yes
Type of method:
pycnometer method
Dynamic viscosity of test material:
no data
Key result
Type:
relative density
Density:
0.957 other: dimensionless
Temp.:
20 °C
Remarks on result:
other: D 20 /4
Key result
Type:
density
Density:
0.957 g/cm³
Temp.:
20 °C

Table: Volume of the pycnometer

 

Test 1

Test 2

Mean

Mass empty pycnometer (A)

30.4747 g

30.4748 g

30.4748 g

Mass pycnometer with water (B)

40.1106 g

40.1105 g

 

Volume of the pycnometer [cm^3]

9.6533

9.6531

9.6532

 

Table: Density of the test item

 

Test 1

Test 2

Mean

Mass pycnometer with test item (C)

39.7105 g

39.7187 g

 

Density [g/cm^3]

0.9568

0.9576

0.957

Conclusions:
The relative density D20/4 of the substance in methanol was determined to be 0.957.
Executive summary:

The relative density was determined using the pycnometer method in a GLP study according to EC A.3, OECD 109 and OPPTS 830.7300. A solution of 56 -57% Benzyltrimethylammonium hydroxide in methanol was tested. A 10 mL volume pycnometer was used. The relative density D20/4 of the substance in methanol was determined in duplicate at 20°C obtaining a mean value of 0.957.

Based on a relative density of methanol of ca 0.8 (SciFinder data base, 25 oct 2018) it can be concluded that the relative density of BTMAOH is ≥ 0.957.

Description of key information

Using the pycnometer method, the relative density of BTMAOH 56-57% in METHANOL was determined to be 0.957. Based on a relative density of methanol of ca 0.8 (SciFinder data base, 25 oct 2018), it can be concluded that the relative density of BTMAOH is >=0.957.

Key value for chemical safety assessment

Relative density at 20C:
0.957

Additional information