alcohols, ethylene glycols, etc.) and aliphatic hydrocarbons. It is also
resistant to dilute minerala cids, inorganic salt solutions, and alkalies.
Chlorinated and aromatic hydrocarbons, organic esters, aromatic hydroxy
compounds,and certain ketones will attackneoprene. Refer to Table 4.12 for
the compatibility of neoprene with selected corrodents and Reference [1] for
am ore complete listing.
4.10.10 Polysulfide Rubber
Polysulfide rubbers are manufactured by combining ethylene (CH 2 a CH 2 )
with an alkaline polysulfide. Morton Thiokol, Inc. marketsaseries of liquid
polysulfides that can be oxidized to rubbers.
The polysulfide rubbers possess outstanding resistance to solvents. They
exhibit excellent resistance to oils, gasoline and aliphatic and aromatic
hydrocarbon solvents, very good resistance to water,good alkali resistance,
and fair acid resistance. Contact with strong concentrated inorganic acids
sucha ss ulfuric, nitric, or hydrochloric, should be avoided. Refer to
Table 4.13 for the compatibility of polysulfides with selected corrodents and
Reference [1] for amorec omprehensive listing.
4.10.11 Hypalon
Chlorosulfonated polyethylene synthetic rubber is manufactured by DuPont
under the trade nameH ypalon. In manyr espects, it is similar to neoprene
but it does possess some advantages over neoprene in certain types of
service. It hasb etterh eata nd ozoner esistance andb etterc hemical
resistance.
Hypalon has abroad range of service temperatures with excellentthermal
properties.G eneral purposec ompounds cano perate continuouslya t
temperatures of 248–275 8 F( 120–1358 C). Specialc ompounds canb e
formulated that can be used intermittently up to 3028 F( 1508 C). On the low
temperature side, conventional compounds can be used continuously down
to 0t o K 208 F(K 18 to K 288 C).
When properlyc ompounded, Hypaloni sr esistant to attack by
hydrocarbon oils and fuels, even at elevated temperatures. It is also resistant
to such oxidizing chemicals as sodium hypochlorite, sodiumperoxide, ferric
chlorides, ands ulfuric, chromic and hydrofluoric acids. Concentrated
hydrochloric acid (37%) at elevatedt emperatures (above 1588 F( 708 C)) will
attack hypalon, but canb eh andled with no adversee ffects at all
concentrations below that temperature. Nitric acid up to 60% concentration
at room temperature can also be handled without adverse effect. Hypalonis
also resistant to salt solutions, alcohols, and bothw eak and concentrated
alkalies. Long-termc ontact with water has little effect on Hypalon.
Hypalon has poor resistance to aliphatic, aromatic, and chlorinated
hydrocarbons, aldehydes, andk etones. Refert oT able4 .14f or the
Corrosion of Linings and Coatings
110
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resistant to dilute minerala cids, inorganic salt solutions, and alkalies.
Chlorinated and aromatic hydrocarbons, organic esters, aromatic hydroxy
compounds,and certain ketones will attackneoprene. Refer to Table 4.12 for
the compatibility of neoprene with selected corrodents and Reference [1] for
am ore complete listing.
4.10.10 Polysulfide Rubber
Polysulfide rubbers are manufactured by combining ethylene (CH 2 a CH 2 )
with an alkaline polysulfide. Morton Thiokol, Inc. marketsaseries of liquid
polysulfides that can be oxidized to rubbers.
The polysulfide rubbers possess outstanding resistance to solvents. They
exhibit excellent resistance to oils, gasoline and aliphatic and aromatic
hydrocarbon solvents, very good resistance to water,good alkali resistance,
and fair acid resistance. Contact with strong concentrated inorganic acids
sucha ss ulfuric, nitric, or hydrochloric, should be avoided. Refer to
Table 4.13 for the compatibility of polysulfides with selected corrodents and
Reference [1] for amorec omprehensive listing.
4.10.11 Hypalon
Chlorosulfonated polyethylene synthetic rubber is manufactured by DuPont
under the trade nameH ypalon. In manyr espects, it is similar to neoprene
but it does possess some advantages over neoprene in certain types of
service. It hasb etterh eata nd ozoner esistance andb etterc hemical
resistance.
Hypalon has abroad range of service temperatures with excellentthermal
properties.G eneral purposec ompounds cano perate continuouslya t
temperatures of 248–275 8 F( 120–1358 C). Specialc ompounds canb e
formulated that can be used intermittently up to 3028 F( 1508 C). On the low
temperature side, conventional compounds can be used continuously down
to 0t o K 208 F(K 18 to K 288 C).
When properlyc ompounded, Hypaloni sr esistant to attack by
hydrocarbon oils and fuels, even at elevated temperatures. It is also resistant
to such oxidizing chemicals as sodium hypochlorite, sodiumperoxide, ferric
chlorides, ands ulfuric, chromic and hydrofluoric acids. Concentrated
hydrochloric acid (37%) at elevatedt emperatures (above 1588 F( 708 C)) will
attack hypalon, but canb eh andled with no adversee ffects at all
concentrations below that temperature. Nitric acid up to 60% concentration
at room temperature can also be handled without adverse effect. Hypalonis
also resistant to salt solutions, alcohols, and bothw eak and concentrated
alkalies. Long-termc ontact with water has little effect on Hypalon.
Hypalon has poor resistance to aliphatic, aromatic, and chlorinated
hydrocarbons, aldehydes, andk etones. Refert oT able4 .14f or the
Corrosion of Linings and Coatings
110
CAT8247—CHAPTER 4—17/10/2006—14:34—SRIDHAR—XML MODEL B–pp. 69–174