Registration Dossier

Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2006-10-13
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
The surface tension analyses on water solutions have been done with a contact angle meter instrument according to the principle pendant drop. An internal method (A1577) was used. The results from this method have been compared with results obtained with the ring method. Good correlation was found between the pendant drop method (A1577) and the ring method. The ring tensiometer is mentioned as a preferred method in “Guidance on information requirements and chemical safety assessment Chapter R.7a: Endpoint specific guidance”.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009

Materials and methods

Principles of method if other than guideline:
Because the solubility of the substance is greater than 1 g/l, a solution of 1g/l was used to determine the surface tension. A syringe was filled with approximately 10 ml of the solution and was attached to the instrument. The solution was mechanically expelled from the syringe so that it formed a drop on the tip of the needle. This drop was examined optically by the software and 20 images were collected at a rate of 1 image every 3 seconds. The surface tension was calculated by the shape of the drop and the result is expressed as a mean value of the 20 images. Because the surface tension was above 60 mN/m, only one measurement was performed.
GLP compliance:
no
Type of method:
other: Pendant drop

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Physical state: solid
- Analytical purity: > 98% GC purity
- Purity test date: 2007-05-03
- Lot/batch No.: 561058
- Storage condition of test material: room temperature

Results and discussion

Surface tension
Surface tension:
72 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Applicant's summary and conclusion

Conclusions:
Surface tension is 72 mN/m at 20°C
Executive summary:

Surface tension is 72 mN/m at 20 °C