2. Temperature resistance: 1808 F/828 Cdry; 1408 F/608 Cw et.
3. Limitations: Dissolved by ketones, aromatics, and ester solvents.
Adhesion may be poor until all solvents have vaporized from the
coating. Relativelylow thickness per coat requiring several coats to
provide adequate protection.
4. Features: Tasteless and odorless.
5. Applications: Used on surfaces exposed to potable water,a sw ell
as for immersionservice, sanitary equipment, and widely used as
industrial coatings.
When used for immersion service, it is essentialt hat all solventsh ave
evaporated before placingt he vinylc oated object into service. The high
polarity of the resin tends to retain the solventsu sed to dissolve the resin.
Solvent evaporation is retarded, with the resultant effect of solvent voids
within the coating, pinholes caused by volatilizationo fr etained solvents
upon heating or water filledblisters because of hydrogen bonding attraction
of water by the retained solventsint he coating.
8.1.2C hlorinated Rubber
Chlorinated rubber resins include those resins produced by the chlorination
of both natural and synthetic rubbers. Chlorine is added to unsaturated
doubleb ondsu ntil the final product contains approximately 65% chlorine.
Ap lastisizer must be added because the finalp roduct is ah ard, brittle
material with poor adhesion and elasticity.T he volume of solids of the
coating dissolvedinhydrocarbon solvents is somewhat higher than that of a
vinyl; therefore, as uitably protective chlorinated rubbers ystem often
consists of only three coats.
1. Resistance: Chemically resistant to acids and alkalies; low permeability to water vapor;abrasion resistant; fire resistant. Nontoxic.
2. Temperature resistance: 2008 F/938 Cdry; 1208 F/498 Cw et.
3. Limitations: Degraded by ultraviolet light; attacked by hydrocarbons.
4. Applications: Excellent adherencet oc oncretea nd masonry. Used
on structures exposedtowater andmarineatmospheres (swimming
pools, etc.).
When used for water immersion service, the same care must be exercised
during evaporation as was described for the vinyls.
8.1.3A crylics
The acrylics can be formulated as thermoplastic resins, thermosetting resins,
and as aw ater emulsion latex.
Corrosion of Linings and Coatings
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3. Limitations: Dissolved by ketones, aromatics, and ester solvents.
Adhesion may be poor until all solvents have vaporized from the
coating. Relativelylow thickness per coat requiring several coats to
provide adequate protection.
4. Features: Tasteless and odorless.
5. Applications: Used on surfaces exposed to potable water,a sw ell
as for immersionservice, sanitary equipment, and widely used as
industrial coatings.
When used for immersion service, it is essentialt hat all solventsh ave
evaporated before placingt he vinylc oated object into service. The high
polarity of the resin tends to retain the solventsu sed to dissolve the resin.
Solvent evaporation is retarded, with the resultant effect of solvent voids
within the coating, pinholes caused by volatilizationo fr etained solvents
upon heating or water filledblisters because of hydrogen bonding attraction
of water by the retained solventsint he coating.
8.1.2C hlorinated Rubber
Chlorinated rubber resins include those resins produced by the chlorination
of both natural and synthetic rubbers. Chlorine is added to unsaturated
doubleb ondsu ntil the final product contains approximately 65% chlorine.
Ap lastisizer must be added because the finalp roduct is ah ard, brittle
material with poor adhesion and elasticity.T he volume of solids of the
coating dissolvedinhydrocarbon solvents is somewhat higher than that of a
vinyl; therefore, as uitably protective chlorinated rubbers ystem often
consists of only three coats.
1. Resistance: Chemically resistant to acids and alkalies; low permeability to water vapor;abrasion resistant; fire resistant. Nontoxic.
2. Temperature resistance: 2008 F/938 Cdry; 1208 F/498 Cw et.
3. Limitations: Degraded by ultraviolet light; attacked by hydrocarbons.
4. Applications: Excellent adherencet oc oncretea nd masonry. Used
on structures exposedtowater andmarineatmospheres (swimming
pools, etc.).
When used for water immersion service, the same care must be exercised
during evaporation as was described for the vinyls.
8.1.3A crylics
The acrylics can be formulated as thermoplastic resins, thermosetting resins,
and as aw ater emulsion latex.
Corrosion of Linings and Coatings
488
CAT8247—CHAPTER 8—17/10/2006—14:20—SRIDHAR—XML MODEL B–pp. 487–507