164
Fundamentals of Corrosion
TabLE 5.5
Water Absorption Rates of Polymers
Polymer
Water Absorption
24 h at 73°F/23°C
(%)
PVC
0.05
CPVC
0.03
PP (Homo)
0.02
PP (Co)
0.05
EHMWPE
<0.01
ECTFE
<0.01
PVDF
<0.04
PVDC (Saran)
nil
PFA
<0.03
ETFE
0.029
PTFE
<0.01
FEP
<0.01
TabLE 5.6
Absorption of Selected Liquids by FEP a
Chemical
Temp.
(°F/°C)
Range of Weight Gains
(%)
Aniline
365/185
0.3–0.4
Acetophenone
394/201
0.6–0.8
Benzaldehyde
354/179
0.4–0.5
Benzyl alcohol
400/204
0.3–0.4
n-Butylamine
172/78
0.3–0.4
Carbon tetrachloride
172/78
2.3–2.4
Dimethyl sulfide
372/190
0.1–0.2
Nitrobenzene
410/210
0.7–0.9
Perchloroethylene
250/121
2.0–2.3
Sulfuryl chloride
154/68
1.7–2.7
Toluene
230/110
0.7–0.8
Tributyl phosphate
392/200 b
1.8–2.0
a
Exposure for 168 h at their boiling points.
b Not boiling.
Fundamentals of Corrosion
TabLE 5.5
Water Absorption Rates of Polymers
Polymer
Water Absorption
24 h at 73°F/23°C
(%)
PVC
0.05
CPVC
0.03
PP (Homo)
0.02
PP (Co)
0.05
EHMWPE
<0.01
ECTFE
<0.01
PVDF
<0.04
PVDC (Saran)
nil
PFA
<0.03
ETFE
0.029
PTFE
<0.01
FEP
<0.01
TabLE 5.6
Absorption of Selected Liquids by FEP a
Chemical
Temp.
(°F/°C)
Range of Weight Gains
(%)
Aniline
365/185
0.3–0.4
Acetophenone
394/201
0.6–0.8
Benzaldehyde
354/179
0.4–0.5
Benzyl alcohol
400/204
0.3–0.4
n-Butylamine
172/78
0.3–0.4
Carbon tetrachloride
172/78
2.3–2.4
Dimethyl sulfide
372/190
0.1–0.2
Nitrobenzene
410/210
0.7–0.9
Perchloroethylene
250/121
2.0–2.3
Sulfuryl chloride
154/68
1.7–2.7
Toluene
230/110
0.7–0.8
Tributyl phosphate
392/200 b
1.8–2.0
a
Exposure for 168 h at their boiling points.
b Not boiling.