Calcium dihydroxide

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2007-07-05 to 2007-07-05

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Study was conducted according to guideline.

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

OECD harmonised ring method

Surface tension:

72 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Conclusions:

The surface tension of a 1 g/l aqueous solution of Precal 50S was determined at 72.0 mN/m. As the surface tension was found to be greater than 60 mN/m, Precal 50S was not considered to be surface active.

Executive summary:

The surface tension of Precal 50S (Calcium dihydroxide (hydrated lime)) was determined by the OECD harmonised ring method and in accordance with OECD guideline 115. The surface tension of a 1 g/l aqueous solution of Precal 50S was found to be 72.0 mN/m. As the result is greater than 60 mN/m, Precal 50S was not considered to be surface active.

Description of key information

Calcium dihydroxide is not surface active.

Key value for chemical safety assessment

Surface tension:

72

in mN/m at 20°C and concentration in mg/L:

1 000

Additional information

The surface tension of calcium dihydroxide (hydrated lime; purity = 98.2%) was determined by the OECD harmonised ring method in accordance with OECD TG 115. The surface tension of a 1 g/l aqueous solution of the substance was found to be 72.0 mN/m. As the result is greater than 60 mN/m, calcium dihydroxide was not considered to be surface active.

No data are available for calcium carbonate. However, based on structure, surface activity is not expected. Therefore, grades of calcium dihydroxide containing up to 35%% calcium carbonate are also not expected to be surface active.