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2. Measurement Procedure
•
Place the bending lever into its
lowest position with the lever in
front of the Tester.
•
Slip the test panel with the coa-
ted side towards the drawbar
between mandrel and drawbar
and in such a position that one
short edge touches the narrow
end of the mandrel (smallest
diameter).
•
Position the test panel between
the clamp plate and Tester
base. Tighten the panel by tur-
ning the cam clockwise for thin
panels and counter-clockwise
for thick panels.
•
Move the bending lever conti-
nuously to the upper position,
thus bending the test panel over
the mandrel through 180° in
about 2-3 sec. (15 sec. accor-
ding to ASTM).
•
Mark the point at which the
cracking stops.
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 10 x magnification.
The length of the extent of cracking
is measured in cm or inch 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 centimeter.
On the edges of the clamp plate is a
ruler in centimeters on one side and
a ruler in inches on the other side.
On the mandrel's base is a ruler that
has centimeter and inch lengths and
the mandrel's diameter at specific
lengths.
For a procedure evaluation consult
the DIN EN ISO or ASTM standards.
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