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EC number: 205-181-1
CAS number: 135-16-0
Table 1: Surface Tension; Temperature
Measurement No 1)
Surface Tension [mN/m]
= standard deviation
the last 10 measurements
from preparation of test solution in the test vessel until end of each
from start of measurement until end of each measurement
Surface tension: 64.75 mN/m at 20°C (OECD 115, GLP)
The surface tension of a 1 g/L (saturated)
aqueous solution of the test item Tetrahydrofolic acid was determined to
be 64.75 mN/m (standard deviation e 0.05 mN/m) at 20 °C, Considering
that distilled water has a surface tension of 72.75 mN/m at 20 °C and
the test item showed a surface tension above 60 mN/m under the
conditions of this referring method, the test item should be regarded as
being not surface-active material.
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