Azelaic acid, calcium salt (1:1)

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

02 January - 10 April 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Version / remarks:

July 27, 1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

March 04, 2016

Deviations:

no

GLP compliance:

yes

Type of method:

OECD harmonised ring method

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material:
13502 or 13995
- Expiration date of the lot/batch:
19 December 2020

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material:
At room temperature

Surface tension:

69.92 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Remarks on result:

other: mean of 5 measurements

The results of the test on the determination of the surface tension of the test solution are given in Table 1. The individual measurements were obtained with a coefficient of variation of < 0.2 mN/m. 

Table 1       Surface Tension of the Test Item

Measurement	Time passed after measurement start [seconds]	Surface tension (mN/m)
		individual σ multiplied by Harkins-Jordan corrected value	mean σ
1	40.18	69.90	69.92
2	67.60	69.92
3	94.46	69.93
4	120.84	69.93
5	147.82	69.93

Conclusions:

Calcium azelate is not a surface active substance. The surface tension of a test solution at a concentration of 1 g/L in water and at 20°C was 69.92 mN/m.

Executive summary:

The surface tension of calcium azelate was determined in a study according to OECD 115 and EU A.5 guidelines using OECD harmonized ring method. The surface tension of a test solution at a concentration of 1 g/L in water and at 20°C was 69.92 mN/m. Based on the test results, the test item is considered not to be surface active.

The study was conducted according to standard guidelines and is GLP-compliant and therefore is considered as reliable without restrictions.

Description of key information

Calcium azelate is considered not to be surface active.The surface tension of a test solution at a concentration of 1 g/L in water and at 20°C was 69.92 mN/m. 

Key value for chemical safety assessment

Surface tension:

69.92

Additional information

The study to determine the surface tension of calcium azelate was conducted according to OECD 115 and EU A.5 guidelines using OECD harmonized ring method (Volic 2019). The surface tension of the test item was determined using the tensiometer. Five measurements were performed until a constant value of the surface tension was reached.

The study was conducted according to standard guidelines and is GLP-compliant and therefore is considered as reliable without restrictions (Klimisch 1).