220
Polyguard
Soprema
Protecto Wrap
200
Royston
NEI
WR Grace
180
160
140
120
100
80
60
40
20
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
Test Number
Figure 12. Puncture test results for second test set.
these and other factors in the process of selecting
nitude of the data scattering. The significance of
sheet membranes.
the superiority of these two membranes with re-
The test results indicate that the NEI and the
spect to the bottom three membranes can be as-
Polyguard sheet membranes ranked second and
serted because it exceeds the magnitude of the data
third in this evaluation. However, the significance
scattering, i.e., the standard deviation. The test
of their relative resistance is obscured by the mag-
data do not allow a statistically valid distinction
220
Polyguard
Soprema
Protecto Wrap
200
Royston
NEI
WR Grace
180
160
140
120
100
80
60
40
20
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
Test Number
Figure 13. Puncture test results for third test set.
14
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