TABLE 8.4
Multilayer Paint Systems Requiring Commercial Blast (SSPC-SP-6) for Surface
Preparation
System A. Inorganic Zinc/Epoxy Mastic
Paint layers
One coat inorganic zinc: 2–3 mils dft (50–75 m m)
One coat epoxy mastic: 4–6 mils dft (100–150 m m)
Properties
Zinc primer provides outstanding corrosion resistance and undercutting resistance.Abarrier
protection for the zinc primer is provided by the finish coat of epoxy which also provides a
color coat for appearance.Suitable for use on carbon steel only
Limitations
Arelatively high level of applicator competencer equired for the primer
System B. Inorganic Zinc/Epoxy Primer/Polyurethane Finish
Paint layers
One coat inorganic zinc: 2–3 mils dft (50–75 m m)
One coat epoxy primer: 4–6 mils dft (100–150 m m)
One coat polyurethane finish: 2–4 mils dft (50–100 m m)
Properties
Zinc primer provides outstanding corrosion resistance and undercutting resistance. The zinc
primer is protected by abarrier coating of epoxy primer,while the finish coat of polyurethane
provides color and gloss retention. This is apremium industrial finish for steel surfaces. Can
only be used on carbon steel
Limitations
Arelatively high level of applicator competencer equired for the primer
System C. Inorganic Zinc/Acrylic Finish
Paint layers
One coat inorganic zinc: 2–3 mils dft (50–75 m m)
One coat acrylic finish: 2–3 mils dft (50–75 m m)
Properties
Zinc primer provides outstandingc orrosion resistance and undercutting resistance. Water
based single package finish has excellent weathering and semigloss appearance
Limitations
Arelatively high level of applicator competencer equired for the primer.T he finish coat has
low temperaturec uring restrictions
System D. Aluminum Epoxy Mastic/Epoxy Finish
Paint layers
One coat aluminum epoxy mastic: 4–6 mils dft (100–150 m m)
One coat epoxy finish: 4–6 mils dft (100–150 m m)
Properties
Can be used on tight rust and marginally preparedsurface. The epoxy finish coat is available
in avariety of colors and has good overall chemicalresistance. May be used on carbon steel or
concrete. Concrete must be clean, rough, and cured at least 28 days. Hand or power tool
cleaning, including water blasting, may be used for surface preparation
( continued )
Corrosion of Linings and Coatings
500
CAT8247—CHAPTER 8—17/10/2006—14:20—SRIDHAR—XML MODEL B–pp. 487–507
Multilayer Paint Systems Requiring Commercial Blast (SSPC-SP-6) for Surface
Preparation
System A. Inorganic Zinc/Epoxy Mastic
Paint layers
One coat inorganic zinc: 2–3 mils dft (50–75 m m)
One coat epoxy mastic: 4–6 mils dft (100–150 m m)
Properties
Zinc primer provides outstanding corrosion resistance and undercutting resistance.Abarrier
protection for the zinc primer is provided by the finish coat of epoxy which also provides a
color coat for appearance.Suitable for use on carbon steel only
Limitations
Arelatively high level of applicator competencer equired for the primer
System B. Inorganic Zinc/Epoxy Primer/Polyurethane Finish
Paint layers
One coat inorganic zinc: 2–3 mils dft (50–75 m m)
One coat epoxy primer: 4–6 mils dft (100–150 m m)
One coat polyurethane finish: 2–4 mils dft (50–100 m m)
Properties
Zinc primer provides outstanding corrosion resistance and undercutting resistance. The zinc
primer is protected by abarrier coating of epoxy primer,while the finish coat of polyurethane
provides color and gloss retention. This is apremium industrial finish for steel surfaces. Can
only be used on carbon steel
Limitations
Arelatively high level of applicator competencer equired for the primer
System C. Inorganic Zinc/Acrylic Finish
Paint layers
One coat inorganic zinc: 2–3 mils dft (50–75 m m)
One coat acrylic finish: 2–3 mils dft (50–75 m m)
Properties
Zinc primer provides outstandingc orrosion resistance and undercutting resistance. Water
based single package finish has excellent weathering and semigloss appearance
Limitations
Arelatively high level of applicator competencer equired for the primer.T he finish coat has
low temperaturec uring restrictions
System D. Aluminum Epoxy Mastic/Epoxy Finish
Paint layers
One coat aluminum epoxy mastic: 4–6 mils dft (100–150 m m)
One coat epoxy finish: 4–6 mils dft (100–150 m m)
Properties
Can be used on tight rust and marginally preparedsurface. The epoxy finish coat is available
in avariety of colors and has good overall chemicalresistance. May be used on carbon steel or
concrete. Concrete must be clean, rough, and cured at least 28 days. Hand or power tool
cleaning, including water blasting, may be used for surface preparation
( continued )
Corrosion of Linings and Coatings
500
CAT8247—CHAPTER 8—17/10/2006—14:20—SRIDHAR—XML MODEL B–pp. 487–507