178
Fundamentals of Corrosion
Modified air-dry phenolics (catalyst required):
•
nearly equal in resistance
to high-bake phenolics; may be formulated for excellent resistance to
alkalies, solvents, salt water, deionized water, fresh water, and mild
acids: excellent for dry products.
Modified PVC polyvinyl chloroacetals, air-cured:
•
excellent resistance to
strong mineral acids and water; most popular lining for water storage tanks; used in water immersion service (potable and marine)
and beverage processing.
PVC plastisols:
•
acid resistant; must be heat cured.
Hypalon:
•
chemical salts.
Epoxy (amine catalyst):
•
good alkali resistance; fair to good resistance
to solvents, mild acids, and dry food product; finds application in
covered hopper car linings and nuclear containment facilities.
Epoxy polyamide:
•
good resistance to water and brines; used in storage
tanks and nuclear containment facilities; poor acid resistance and
fair alkali resistance.
Epoxy polyester:
•
good abrasion resistance; used for covered hopper
car linings; poor solvent resistance.
Epoxy coal tar:
•
excellent resistance to mild acids, mild alkalies, salt
water, and fresh water; poor solvent resistance; used for crude oil
storage tanks, sewage disposal plants, and water works.
Coal tar:
•
excellent water resistance; used for water tanks.
Asphalts:
•
good acid and water resistance.
Neoprene:
•
good acid and flame resistance; used for chemical processing equipment.
Polysulfide:
•
good water and solvent resistance.
Butyl rubber:
•
good water resistance.
Styrene-butadiene polymers:
•
finds application in food and beverage
processing and in the lining of concrete tanks.
Rubber latex:
•
excellent alkali resistance; finds application in caustic
tanks (50–73%), at 180 to 250°F (82 to 121°C).
Urethanes:
•
superior abrasion resistance; excellent resistance to strong
mineral acids and alkalis; fair solvent resistance; used to line dishwashers and washing machines.
Vinyl ester:
•
excellent resistance to strong acids and better resistance
up to 350 to 400°F (193 to 204°C), depending on thickness.
Vinyl urethanes:
•
finds application in food processing, hopper cars,
and wood tanks.
Fluoropolymers:
•
high chemical resistance and fire resistance; used in
SO 2 scrubber service.
Fundamentals of Corrosion
Modified air-dry phenolics (catalyst required):
•
nearly equal in resistance
to high-bake phenolics; may be formulated for excellent resistance to
alkalies, solvents, salt water, deionized water, fresh water, and mild
acids: excellent for dry products.
Modified PVC polyvinyl chloroacetals, air-cured:
•
excellent resistance to
strong mineral acids and water; most popular lining for water storage tanks; used in water immersion service (potable and marine)
and beverage processing.
PVC plastisols:
•
acid resistant; must be heat cured.
Hypalon:
•
chemical salts.
Epoxy (amine catalyst):
•
good alkali resistance; fair to good resistance
to solvents, mild acids, and dry food product; finds application in
covered hopper car linings and nuclear containment facilities.
Epoxy polyamide:
•
good resistance to water and brines; used in storage
tanks and nuclear containment facilities; poor acid resistance and
fair alkali resistance.
Epoxy polyester:
•
good abrasion resistance; used for covered hopper
car linings; poor solvent resistance.
Epoxy coal tar:
•
excellent resistance to mild acids, mild alkalies, salt
water, and fresh water; poor solvent resistance; used for crude oil
storage tanks, sewage disposal plants, and water works.
Coal tar:
•
excellent water resistance; used for water tanks.
Asphalts:
•
good acid and water resistance.
Neoprene:
•
good acid and flame resistance; used for chemical processing equipment.
Polysulfide:
•
good water and solvent resistance.
Butyl rubber:
•
good water resistance.
Styrene-butadiene polymers:
•
finds application in food and beverage
processing and in the lining of concrete tanks.
Rubber latex:
•
excellent alkali resistance; finds application in caustic
tanks (50–73%), at 180 to 250°F (82 to 121°C).
Urethanes:
•
superior abrasion resistance; excellent resistance to strong
mineral acids and alkalis; fair solvent resistance; used to line dishwashers and washing machines.
Vinyl ester:
•
excellent resistance to strong acids and better resistance
up to 350 to 400°F (193 to 204°C), depending on thickness.
Vinyl urethanes:
•
finds application in food processing, hopper cars,
and wood tanks.
Fluoropolymers:
•
high chemical resistance and fire resistance; used in
SO 2 scrubber service.