Reaction products of boric acid and lithium hydroxide

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

read-across based on grouping of substances (category approach)

Adequacy of study:

key study

Justification for type of information:

All members of the category ‘Lithium salts of the oxyacids of boron (B)’ are formed in situ and are immediately formulated into grease thickeners which are marketed and used within the EU/EEA. Dilithium tetraborate is the only member to be manufactured and isolated in an available form for testing. All other members are not isolated and would require extraction from the grease thickener products for testing to be conducted on the isolated substance itself. As testing requires a substantial quantity of material, it was decided to perform the testing on the only isolated product, dilithium tetraborate for this category approach..

All of the substances in this category are inorganic lithium salts of boric acid and are solid at ambient temperature and are expected to have similar physiochemical properties. A density value of 2.37 g/cm3 was obtained in an experimental study on dilithium tetraborate and a similar value of 2.18 g/cm3 is quoted for lithium metaborate which confirms the similarity in density between the category members. Read-across to the experimental study on dilithium tetraborate is therefore proposed to fill the density endpoint for the REACH registration of the UVCB - Reaction products of boric acid and lithium hydroxide.

Type:

density

Density:

2.37 g/cm³

Temp.:

20 °C

Type:

relative density

Density:

2.37 other: no units

Temp.:

20 °C

Conclusions:

The density of the UVCB - Reaction products of boric acid and lithium hydroxide should not vary considerably to the value obtained for dilithium tetraborate. The relative density of lithium tetrahydroxyborate can therefore be quoted as 2.37. The sample density was determined to be 2370 kg/m3.

Executive summary:

The density of dilithium tetraborate was determined using the pycnometer method according to EU Method A3. The relative density of the test item was determined to be 2.37. The sample density was determined to be 2370 kg/m³. The density of the UVCB - Reaction products of boric acid and lithium hydroxide should not vary considerably to the value obtained for dilithium tetrahydroxyborate.

Description of key information

The density of dilithium tetraborate was determined using the pycnometer method according to EU Method A3. The relative density of the test item was determined to be 2.37. The sample density was determined to be 2370 kg/m³. The density of the UVCB - Reaction products of boric acid and lithium hydroxide should not vary considerably to the value obtained for dilithium tetraborate.

Key value for chemical safety assessment

Relative density at 20C:

2.37