Registration Dossier
Registration Dossier
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EC number: 234-511-7 | CAS number: 12007-56-6
Surface tension
Administrative data
Link to relevant study record(s)
- 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 calcium 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 calcium ions. The surface tension measured will therefore be the result of the interactions of the liquid molecules with boric acid and calcium ions. As a result, all calcium borate substances will have the same surface tension value to report. Read-across to the result for calcium metaborate is therefore proposed for all calcium borate substances in this category.
- Key result
- Surface tension:
- 72.1 mN/m
- Temp.:
- 20 °C
- Conc.:
- 1 g/L
- Conclusions:
- The surface tension of calcium tetraborate is 72.1 mN/m.
- Executive summary:
All calcium 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 calcium ions. The surface tension measured will therefore be the result of the interactions of the liquid molecules with boric acid and calcium ions.
The surface tension of calcium metaborate was determined to be 72.1 mN/m using the ring method in accordance with EU Method A5. The surface tension of calcium tetraborate will also be reported as 72.1 mN/m.
Reference
Description of key information
The surface tension of calcium metaborate was determined to be 72.1 mN/m using the ring method in accordance with EU Method A5. Read-across to calcium metaborate is proposed so therefore the surface tension of calcium tetraborate will also be reported as 72.1 mN/m.
Key value for chemical safety assessment
- Surface tension:
- 72.1
- in mN/m at 20°C and concentration in mg/L:
- 1 000
Additional information
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