background image
FFV
: Fractional Free Volume
CED
: Cohesive Energy Density
High Barrier Requires:
HIGH BARRIER: FFV/CED
O
x
y
g
en
P
e
rm
e
a
bi
li
ty
0.001
0.01
0.1
1
10
100
1000
0
0.0005
0.001
0.0015
0.002
0.0025
FFV
/
CED
(cc/cal)
(c
c

m
m
/
m
2

d
a
y
a
tm
)
PET
HDPE
EVOH
PVC
PA6
PK
HIGH BARRIER