ALTANA Conical Mandrel Bending Tester User Manual

Page 14

Evaluation of the Test Panel

Examine the coating immediately
for cracking and / or detachment
from the substrate either with the
unaided eye or, by agreement, with
a lens of 10fold magniﬁ cation.

The length of the extent of cracking
is measured in cm along the test
panel from the small end of the
mandrel. Calculate the mean value
of three tests and report the result
to the nearest centimetre.

For a procedure evaluation consult
the DIN EN ISO or ASTM
standards.

• Place the bending lever into its
lower, horizontal position.

• It is recommended to cover the
coated side of the test panel with
a sheet of paper to avoid
mechanical damage of the ﬁ lm.

• Slip the test panel with the coated
side towards the drawbar
between mandrel and drawbar
and in such a position that one
short edge touches the narrow
end of the mandrel.

• Fixedly clamp the test panel using
the 3 thumb nuts.

• Move the bending lever
continuously to the upper position,
thus bending the test panel over
the mandrel through 180° in about
2 - 3 sec. (15 sec. according to
ASTM).

• Mark the point at which the
cracking

stops.

2. Measurement Procedure