8.6.3 Area 3. Normally DryExteriors
This includes suchl ocations as parking lots, water storage tanks, exterior
storage sheds, and lighting or power line poles that are exposed to sunlight
in ar elatively dry location.Under these conditions, oil based paints should
last six or more years. Thesem aterials that are resistant to ultraviolet rays
and aren ormally rated fore xterioru se includea crylics, alkyds, silicones,
and polyurethanes.
Epoxies will lose gloss, normally chalk,a nd fade rapidly when exposed
to UV rays. Recommended systems include Ai nT able 8.6,Cin Table 8.7,
Ai nT able 8.8,a nd Ai nT able 8.9.
8.6.4 Area 4. Freshwater Exposure
Under this category,t he surfacet ob ep rotected is frequently wetted by
freshwater from condensation, splash,o rs pray.I ncluded are interior or
TABLE 8.5 Continued
Properties
Provides excellent barrier protection and is the most economical of the water lining systems or
for water immersion. Normally used on carbon steel and concrete.
System F. Solventless Elastomeric Polyurethane
Paint layers
One coat elastomeric polyurethane: 20–250 mils dft (500–6250 m m)
Properties
Excellentb arrier protection. Normally used on carbon steel and concrete.
Limitations
Must be applied by aknowledgeable contractor.
TABLE 8.6
Multilayer Paint Systems Requiring Surface to be Clean, Dry,and Free of Loose Dirt,
Oil, and Chemical Contamination
System A. AluminumE poxy Mastic/Polyurethane Finish
Paint layers
One coat aluminum epoxy mastic: 4–6 mils dft (100–150 m m)
One coat polyurethane finish: 2–4 mils dft (50–100 m m)
Properties
Excellentover tight rust. Tolerant of minimally preparedsteel. May be applied to awide range
of surfaces, but normally used on carbon steel and concrete. This is apremium system to use
when cleaning must be minimal.
Limitations
In order to cureproperly,temperaturem ust be above 508 F/108 C. For lower temperature
requirements other aluminum epoxy/urethane mastics may be substituted.
Specific Organic Coatings
503
CAT8247—CHAPTER 8—17/10/2006—14:20—SRIDHAR—XML MODEL B–pp. 487–507
This includes suchl ocations as parking lots, water storage tanks, exterior
storage sheds, and lighting or power line poles that are exposed to sunlight
in ar elatively dry location.Under these conditions, oil based paints should
last six or more years. Thesem aterials that are resistant to ultraviolet rays
and aren ormally rated fore xterioru se includea crylics, alkyds, silicones,
and polyurethanes.
Epoxies will lose gloss, normally chalk,a nd fade rapidly when exposed
to UV rays. Recommended systems include Ai nT able 8.6,Cin Table 8.7,
Ai nT able 8.8,a nd Ai nT able 8.9.
8.6.4 Area 4. Freshwater Exposure
Under this category,t he surfacet ob ep rotected is frequently wetted by
freshwater from condensation, splash,o rs pray.I ncluded are interior or
TABLE 8.5 Continued
Properties
Provides excellent barrier protection and is the most economical of the water lining systems or
for water immersion. Normally used on carbon steel and concrete.
System F. Solventless Elastomeric Polyurethane
Paint layers
One coat elastomeric polyurethane: 20–250 mils dft (500–6250 m m)
Properties
Excellentb arrier protection. Normally used on carbon steel and concrete.
Limitations
Must be applied by aknowledgeable contractor.
TABLE 8.6
Multilayer Paint Systems Requiring Surface to be Clean, Dry,and Free of Loose Dirt,
Oil, and Chemical Contamination
System A. AluminumE poxy Mastic/Polyurethane Finish
Paint layers
One coat aluminum epoxy mastic: 4–6 mils dft (100–150 m m)
One coat polyurethane finish: 2–4 mils dft (50–100 m m)
Properties
Excellentover tight rust. Tolerant of minimally preparedsteel. May be applied to awide range
of surfaces, but normally used on carbon steel and concrete. This is apremium system to use
when cleaning must be minimal.
Limitations
In order to cureproperly,temperaturem ust be above 508 F/108 C. For lower temperature
requirements other aluminum epoxy/urethane mastics may be substituted.
Specific Organic Coatings
503
CAT8247—CHAPTER 8—17/10/2006—14:20—SRIDHAR—XML MODEL B–pp. 487–507