Elcometer 1500 Gebrauchsanleitung Seite 7

2 TESTING A SPECIMEN (continued)
6. If the coating is not damaged, take a new test panel, select the
next smallest mandrel in the set
the smallest mandrel which produces no damage to the coating
is determined.
7. If required, calculate the total elongation:
If the coating is 25 μm (1 mil) thick, use Table 1 to determine
elongation. Table 1 gives the elongation of a 25 μm (1 mil) thick
coating on 0.8 mm (1/32") cold-rolled steel.
Mandrel diameter
(inches)
1
3/4
1/2
3/8
1/4
1/8
If the coating thickness exceeds 25 μm (1 mil), use the following
formula and Table 2 to determine elongation:
E = e + tc
where:
E = Total elongation, %
e = elongation from Table 1
t = coating thickness, mils, and
c = correction factor from Table 2
1. Please note that this bending test can be also a 'Pass/Fail' test for a specific
diameter.
en-5
R
Table 1: Elongation
, and repeat steps 2 to 5 until
1
(mm)
25
19
12.7
9.5
6.4
3.2
Elongation (e) (%)
3.3
4.4
6.75
9.0
14.0
28.0
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