The furan resins are not satisfactory for use with oxidizingm edia, such
as chromic or nitric acids, peroxides, hypochlorites, chlorine, phenol,a nd
concentrated sulfuric acid. Refer to Table 4.6 fort he compatibility of furan
resins with selected corrodents and Reference [1] for am ore complete
listing.
4.10.4V inyl Esters
The vinyl ester class of resins was developed during the late 1950s and early
1960s. Vinyl estersw ere first used as dental fillings. They had improved
toughness and bonding ability over the acrylic materials that were being
used at that time.O ver the next several years, changes in the molecular
structure of the vinyl esters produced resins that found extensive use in
corrosion-resistante quipment.
Present-day vinyl estersp ossess several advantages over unsaturated
polyesters. They provide toughness in the cured polymerw hile maintainingg oodt hermal stability andp hysicalp ropertiesa te levated
temperatures.
Vinyl estersa re available in various formulations. Halogenated modifications are available where fire resistance and ignition resistance are major
concerns. The vinyl esters are resistant up to 4008 F(2048 C).
Vinyl esters can be used to handle most hot, highly chlorinated and acid
mixtures at elevated temperatures. They also provide excellent resistance to
strong mineral acidsa nd bleaching solutions. Vinyl esters excel in alkaline
and bleach environments and are used extensively in the very corrosive
conditions found in the pulp and paper industry.
The family of vinyle sters includes aw ide variety of formulations. As a
result, there can be differences in the compatibility in areference table. One
must keep in mind that all formulationswill not act as shown. An indication
that avinyl ester is compatible generallymeans that at least one formulation
is compatible. Thisisthe case in Table4.7 which shows the compatibility of
vinyl ester with selected corrodents. The resin manufacturer must be
consulted to verify the resistance.
4.10.5E poxy Polyamide
Polyamide resins (nylons) can react with epoxies to form durable protective
liningsw ith at emperature resistance of 2258 F( 1078 C) dry and 1508 F( 668 C)
wet. The chemical resistance of the polyamides is inferior to that of the
amine-cured epoxies.T hey are partially resistant to acids, acid salts,
alkaline and organic solvents, and are resistant to moisture. Refer to
Table4 .8 fort he compatibilityo fe poxy polyamides with selected
corrodents and to Reference [1] for am ore completel isting. Applications
include storage tanks and nuclear containment facilities.
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as chromic or nitric acids, peroxides, hypochlorites, chlorine, phenol,a nd
concentrated sulfuric acid. Refer to Table 4.6 fort he compatibility of furan
resins with selected corrodents and Reference [1] for am ore complete
listing.
4.10.4V inyl Esters
The vinyl ester class of resins was developed during the late 1950s and early
1960s. Vinyl estersw ere first used as dental fillings. They had improved
toughness and bonding ability over the acrylic materials that were being
used at that time.O ver the next several years, changes in the molecular
structure of the vinyl esters produced resins that found extensive use in
corrosion-resistante quipment.
Present-day vinyl estersp ossess several advantages over unsaturated
polyesters. They provide toughness in the cured polymerw hile maintainingg oodt hermal stability andp hysicalp ropertiesa te levated
temperatures.
Vinyl estersa re available in various formulations. Halogenated modifications are available where fire resistance and ignition resistance are major
concerns. The vinyl esters are resistant up to 4008 F(2048 C).
Vinyl esters can be used to handle most hot, highly chlorinated and acid
mixtures at elevated temperatures. They also provide excellent resistance to
strong mineral acidsa nd bleaching solutions. Vinyl esters excel in alkaline
and bleach environments and are used extensively in the very corrosive
conditions found in the pulp and paper industry.
The family of vinyle sters includes aw ide variety of formulations. As a
result, there can be differences in the compatibility in areference table. One
must keep in mind that all formulationswill not act as shown. An indication
that avinyl ester is compatible generallymeans that at least one formulation
is compatible. Thisisthe case in Table4.7 which shows the compatibility of
vinyl ester with selected corrodents. The resin manufacturer must be
consulted to verify the resistance.
4.10.5E poxy Polyamide
Polyamide resins (nylons) can react with epoxies to form durable protective
liningsw ith at emperature resistance of 2258 F( 1078 C) dry and 1508 F( 668 C)
wet. The chemical resistance of the polyamides is inferior to that of the
amine-cured epoxies.T hey are partially resistant to acids, acid salts,
alkaline and organic solvents, and are resistant to moisture. Refer to
Table4 .8 fort he compatibilityo fe poxy polyamides with selected
corrodents and to Reference [1] for am ore completel isting. Applications
include storage tanks and nuclear containment facilities.
Liquid-Applied Linings
93
CAT8247—CHAPTER 4—17/10/2006—14:33—SRIDHAR—XML MODEL B–pp. 69–174