PS Guide 12.00, Guide to Zinc-Rich Coating Systems

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This guide provides general information on the description, selection, and application of zinc-rich coatings and the selection of topcoats. 

Zinc-rich primers as referenced in this guide are broadly defined as primers containing high levels of zinc, such as SSPC-Paint 20 or SSPC-Paint 29. 

Zinc-rich coatings are classified as follows: 

# Type IA Inorganic _ post-cured, water-borne, alkali-silicates 

# Type IB Inorganic _ self-cured, water-borne, alkali-silicates 

# Type IC Inorganic _ self-cured, solvent-borne, alkyl-silicates 

# Type IIA Organic _ thermoplastic binders 

# Type IIB Organic _ thermoset binders 

Zinc-rich coatings, both topcoated and untopcoated, have been used successfully in a wide variety of environmental zones. A detailed breakdown of applicability of various types of zinc-rich coatings in different environmental zones is provided.

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