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FFV
: Fractional Free Volume
CED
: Cohesive Energy Density
High Barrier Requires:
O
x
y
g
e
n

P
e
r
m
e
a
b
i
l
i
t
y
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
t
m
)
PET
HDPE
EVOH
PVC
PA6
PK
HIGH BARRIER