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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Justification for type of information:
At liquid–air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion). Thus, the surface becomes under tension from the imbalanced forces. All lithium borate substances in this category are expected to have the same surface tension properties since they contain the same functional groups and once dissolved in water will dissociate to boric acid and lithium ions. The surface tension measured will therefore be the result of the interactions of the liquid molecules with boric acid and lithium ions. As a result, all lithium borate substances will have the same surface tension value to report. Read-across to the result for dilithium tetraborate is therefore proposed for all lithium borate substances in this category.
Key result
Surface tension:
63.4 - <= 71.6 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Conclusions:
The surface tension of lithium tetrahydroxyborate is 63.4-71.6 mN/m (read-across from dilithium tetraborate).
Executive summary:

All lithium borate substances in this category are expected to have the same surface tension properties since they contain the same functional groups and once dissolved in water will dissociate to boric acid and lithium ions. The surface tension measured will therefore be the result of the interactions of the liquid molecules with boric acid and lithium ions. 

The surface tension of dilithium tetraborate was determined to be 63.4 -71.6 mN/m using the ring method in accordance with EU Method A5. The surface tension of lithium tetrahydroxyborate will also be reported as the same value.

Description of key information

The surface tension of dilithium tetraborate was determined to be 63.4 -71.6 mN/m using the ring method in accordance with EU Method A5. Read-across to dilithium tetraborate is proposed so therefore the surface tension of lithium tetrahydroxyborate will also be reported as 63.4 -71.6 mN/m.

Key value for chemical safety assessment

Surface tension:
71.6
in mN/m at 20°C and concentration in mg/L:
1 000

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