Corrosion of Polymer (Plastic) Materials
161
TabLE 5.2
Vapor Permeation into FEP
Permeation (g/100 in. 2 /24 h/mil) at
73°F/23°C
93°F/35 °C
122°F/50°C
Gases:
Nitrogen
0.18
Oxygen
0.39
Vapors:
Acetic acid
0.42
Acetone
0.13
0.95
3.29
Acetophenone
0.47
Benzene
0.15
0.64
n-Butyl ether
0.08
Carbon tetrachloride
0.11
0.31
Decane
0.72
1.03
Ethyl acetate
0.06
0.77
2.9
Ethyl alcohol
0.11
0.69
Hexane
0.57
Hydrochloric acid, 20%
<0.01
Methanol
5.61
Sodium hydroxide
4 × 10 −5
Sulfuric acid, 98%
8 × 10 −6
Toluene
0.37
2.93
TabLE 5.3
Permeation of Gases into PFA
Gas
Permeation at 77°F/25°C
(cc/mil thickness /100 in. 2 /24 h/atm)
Carbon dioxide
2260
Nitrogen
291
Oxygen
881
161
TabLE 5.2
Vapor Permeation into FEP
Permeation (g/100 in. 2 /24 h/mil) at
73°F/23°C
93°F/35 °C
122°F/50°C
Gases:
Nitrogen
0.18
Oxygen
0.39
Vapors:
Acetic acid
0.42
Acetone
0.13
0.95
3.29
Acetophenone
0.47
Benzene
0.15
0.64
n-Butyl ether
0.08
Carbon tetrachloride
0.11
0.31
Decane
0.72
1.03
Ethyl acetate
0.06
0.77
2.9
Ethyl alcohol
0.11
0.69
Hexane
0.57
Hydrochloric acid, 20%
<0.01
Methanol
5.61
Sodium hydroxide
4 × 10 −5
Sulfuric acid, 98%
8 × 10 −6
Toluene
0.37
2.93
TabLE 5.3
Permeation of Gases into PFA
Gas
Permeation at 77°F/25°C
(cc/mil thickness /100 in. 2 /24 h/atm)
Carbon dioxide
2260
Nitrogen
291
Oxygen
881