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.
