Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Surface tension
Administrative data
Link to relevant study record(s)
- Endpoint:
- surface tension
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
The UVCB - Reaction products of boric acid and calcium dihydroxide and lithium hydroxide (EC # 701-453-3) has structural similarities to two already established categories: lithium salts of the oxyacids of boron (B); and calcium salts of the oxyacids of boron (B). Dilithium tetraborate (EC# 234-514-3) (source substance #1) and calcium metaborate (EC# 237-224-5) (source substance #2) will be used to predict the properties for the target substance.
The target UVCB substance is made up of components from both categories and is manufactured by mixing calcium hydroxide, lithium hydroxide and boric acid in an oil medium in such a ratio that they react to form a complex mixture of lithium calcium borates as components of a colloidal mixture which is subsequently used as a lubricating grease.
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.
The target UVCB substance has a higher precursor molar ratio for lithium hydroxide than for calcium hydroxide, and therefore the precautionary principle should be applied and read across from dilithium tetraborate where relevant to consider the worst case. Nonetheless, once dissolved in water the UVCB will dissociate to boric acid, lithium ions and calcium ions. The surface tension measured will therefore be the result of the interactions of the liquid molecules with boric acid, lithium ions and calcium ions. Therefore in this case read-across should range between the results for dilithium tetraborate and calcium metaborate.- Reason / purpose for cross-reference:
- read-across source
- Reason / purpose for cross-reference:
- read-across source
- Key result
- Surface tension:
- 63.4 - <= 71.6 mN/m
- Temp.:
- 20 °C
- Conc.:
- 1 g/L
- Remarks on result:
- other: Dilithium tetraborate
- Key result
- Surface tension:
- 72.1 mN/m
- Temp.:
- 20 °C
- Conc.:
- 1 g/L
- Remarks on result:
- other: Calcium metaborate
- Conclusions:
- The surface tension of Reaction products of boric acid and calcium dihydroxide and lithium hydroxide is 63.4-72.1 mN/m ( range read-across from dilithium tetraborate and calcium tetraborate).
- Executive summary:
The target UVCB substance has a higher precursor molar ratio for lithium hydroxide than for calcium hydroxide, and therefore the precautionary principle should be applied and read across from dilithium tetraborate where relevant to consider the worst case. Nonetheless, once dissolved in water the UVCB will dissociate to boric acid, lithium ions and calcium ions. The surface tension measured will therefore be the result of the interactions of the liquid molecules with boric acid, lithium ions and calcium ions. Therefore in this case read-across should range between the results for dilithium tetraborate and calcium metaborate.
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 calcium metaborate was determined to be 72.1 mN/m using the ring method in accordance with EU Method A5. The surface tension of Reaction products of boric acid and calcium dihydroxide and lithium hydroxide will therefore accommodate this range and be 63.4-72.1 mN/m.
Reference
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. 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 Reaction products of boric acid and calcium dihydroxide and lithium hydroxide will therefore accommodate this range and be 63.4-72.1 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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