Conversion Factors
The tables below provide conversion factors for permeable units (gases) as well as water vapor transmission rates.
Conversion of Permeable Units (Gases)
|
To Obtain
|
Multiply
|
|
cc • mil
100 in2 • 24 hr • atm
|
cc • mil
m2 • 24 hr • atm
|
cc • cm2
cm3 • sec • atm
|
cc • mm
m2 • 24 hr • atm
|
cc • cm2
cm3 • sec • cmHg
|
cc • µm
m2 • 24 hr • atm
|
cc • 20µm
m2 • 24 hr • atm
|
|
cc • mil
100 in2 • 24 hr • atm
|
1
|
6.452 x 10-2
|
2.195 x 1010
|
2.54
|
1.668 x 1012
|
2.54 x 10-3
|
5.08 x 10-2
|
|
cc • mil
m2 • 24 hr • atm
|
15.50
|
1
|
3.402 x 1011
|
39.37
|
2.585 x 1013
|
3.94 x 10-2
|
7.874 x 10-1
|
|
cc • cm2
cm3 • sec • atm
|
4.557 x 10-11
|
2.939 x 10-12
|
1
|
1.157 x 10-10
|
76.00
|
1.16 x 10-13
|
2.315 x 10-12
|
|
cc • mm
m2 • 24 hr • atm
|
3.94 x 10-1
|
2.540 x 10-2
|
8.642 x 109
|
1
|
6.567 x 1011
|
1.00 x 10-3
|
2.0 x 10-2
|
|
cc • cm2
cm3 • sec • cmHg
|
5.996 x 10-13
|
3.860 x 10-14
|
1.316 x 10-2
|
1.523 x 10-12
|
1
|
1.52 x 10-15
|
3.046 x 10-14
|
|
cc • µm
m2 • 24 hr • atm
|
3.940 x 102
|
25.40
|
8.64 x 1012
|
1.00 x 103
|
6.57 x 1014
|
1
|
20.00
|
|
cc • 20µm
m2 • 24 hr • atm
|
19.68
|
1.27
|
4.32 x 1011
|
50.00
|
3.283 x 1013
|
5.00 x 10-2
|
1
|
Water Vapor Transmission Rate (WVTR) Conversion Factors
|
To Obtain
|
Multiply
|
|
g • cm
m2 • day
|
g • mil
m2 • day
|
g • mil
100 in2 • hr
|
g • mi
100 in2 • hr
|
g • mi
100 in2 • day
|
g • cm
µm2 • day
|
|
g • cm
m2 • day
|
1
|
2.54 x 10-3
|
6.10 x 10-4
|
9.45 x 10-1
|
3.94 x 102
|
1.00 x 10-4
|
|
g • mil
m2 • day
|
3.94 x 102
|
1
|
2.40 x 10-1
|
3.72 x 102
|
15.50
|
3.94 x 10-2
|
|
g • mil
100 in2 • hr
|
1.64 x 103
|
4.17
|
1
|
1.55 x 103
|
64.58
|
1.64 x 10-1
|
|
g • mi
100 in2 • hr
|
1.06
|
2.69 x 10-3
|
6.45 x 10-4
|
1
|
4.17 x 10-2
|
1.06 x 10-4
|
|
g • mi
100 in2 • day
|
25.40
|
6.45 x 10-2
|
1.55 x 10-2
|
24.00
|
1
|
2.54 x 10-3
|
|
g • cm
µm2 • day
|
1.00 x 104
|
25.40
|
6.10
|
9.45 x 103
|
3.94 x 102
|
1
|
| Reference: J. Brandrup and E.H. Immergut, Ed. Polymer Handbook, John Wiley and Sons, New York (1975). |
