6.6.8 Perfluoralkoxy
Perfluoralkoxy(PFA) can be continuously used at 5008 F(2608 C). It is subject
to permeation by certain gases and will absorb liquids. Table 6.30 illustrates
the permeability of PFA, and Table 6.31 lists the absorption of representative
liquidsb yP FA.
Perfluoralkoxy is inertt os trongm ineral acids, inorganicb ases, inorganic
oxidizers,aromatics,somealiphatic hydrocarbons,alcohols,aldehydes, ketones,
esters,ethers,chlorocarbons,fluorocarbons,and mixtures of these compounds.
TABLE 6.30
Permeation of Various Gases in PFAa t77 8 F( 258 C)
Gas
Permeation
(cm
3 mil thickness/100 in.
2 24 ha tm)
Carbon dioxide
2260
Nitrogen
291
Oxygen
881
TABLE 6.31
Absorption of Representative Liquids in PFA
Liquids
a
Te mperature, 8 F/8 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 tetrachloride1 72/78
2.3–2.4
Dimethyl sulfoxide
372/190
0.1–0.2
Freon 1131 17/47
1.2
Isooctane
210/99
0.7–0.8
Nitrobenzene
410/210
0.7–0.9
Perchlorethylene
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
Bromine, anhydrous
K 5/K 22
0.5
Chlorine, anhydrous
248/120
0.5–0.6
Chlorosulfonic acid
302/150
0.7–0.8
Chromic acid, 50%
248/120
0.00–0.01
Ferric chloride
212/100
0.00–0.01
Hydrochloric acid, 37%
248/120
0.00–0.03
Phosphoric acid, conc.
212/100
0.00–0.01
Zinc chloride
212/100
0.00–0.03
a Liquids weree xposed for 168 hours at the boiling point of the solvents. The acidic reagents
wereexposed for 168 hours.
b Not boiling.
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Perfluoralkoxy(PFA) can be continuously used at 5008 F(2608 C). It is subject
to permeation by certain gases and will absorb liquids. Table 6.30 illustrates
the permeability of PFA, and Table 6.31 lists the absorption of representative
liquidsb yP FA.
Perfluoralkoxy is inertt os trongm ineral acids, inorganicb ases, inorganic
oxidizers,aromatics,somealiphatic hydrocarbons,alcohols,aldehydes, ketones,
esters,ethers,chlorocarbons,fluorocarbons,and mixtures of these compounds.
TABLE 6.30
Permeation of Various Gases in PFAa t77 8 F( 258 C)
Gas
Permeation
(cm
3 mil thickness/100 in.
2 24 ha tm)
Carbon dioxide
2260
Nitrogen
291
Oxygen
881
TABLE 6.31
Absorption of Representative Liquids in PFA
Liquids
a
Te mperature, 8 F/8 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 tetrachloride1 72/78
2.3–2.4
Dimethyl sulfoxide
372/190
0.1–0.2
Freon 1131 17/47
1.2
Isooctane
210/99
0.7–0.8
Nitrobenzene
410/210
0.7–0.9
Perchlorethylene
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
Bromine, anhydrous
K 5/K 22
0.5
Chlorine, anhydrous
248/120
0.5–0.6
Chlorosulfonic acid
302/150
0.7–0.8
Chromic acid, 50%
248/120
0.00–0.01
Ferric chloride
212/100
0.00–0.01
Hydrochloric acid, 37%
248/120
0.00–0.03
Phosphoric acid, conc.
212/100
0.00–0.01
Zinc chloride
212/100
0.00–0.03
a Liquids weree xposed for 168 hours at the boiling point of the solvents. The acidic reagents
wereexposed for 168 hours.
b Not boiling.
Sheet Linings
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