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Surface tension

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surface tension
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
For details and justification of read-across please refer to the read-across report attached to IUCLID section 13.
Reason / purpose for cross-reference:
read-across source
Key result
Surface tension:
70.7 mN/m
20 °C
1 g/L
In conclusion, it can be stated that under the conditions decribed 1 g/L of Lactic acid 93% has a surface tension value at 20 °C of 70.7 mN/m. Therefore, lactic acid 93% aq is considered as not surface active.
Executive summary:

The OECD harmonized ring method (OECD TG 115) was used for the determination of the surface tension of Lactic acid 93% aq. The surface tension of a test solution at a concentration of 1 g/L and at 20 °C was 70.7 mN/m. According to this, the test substance is considered as not surface active.

This information is used in a read-across approach in the assessment of the target substance. For justification of read-across please refer to the attached read-across report (see IUCLID section 13).

surface tension
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because surface activity is not a desired property of the material

Description of key information

Dilactide is a mixture of D-lactide and L-lactide and all lactides undergo rapid hydrolysis, forming lactic acid. Lactic acid is not surface active, with a surface tension of 70.7 mN/m as shown in a GLP study conducted according to OECD TG 115. In addition and in accordance with REACH Regulation 1907/2006 Annex VII, section 7.6 a study with the target substance does not need to be conducted as surface activity is not a desired property.

Key value for chemical safety assessment

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

Additional information