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February 24 - February 28, 2020

What are the significant differences in performance between an inorganic zinc primer (ethyl silicate) and an organic zinc primer (epoxy), given the same application and exposure conditions?

Selected Answers

From Jeff Kim of Sherwin-Williams on February 24, 2020:
Probably the most significant difference is that in atmospheric exposures, IOZ primer can be used as a stand-alone coating, whereas an OZ primer must be topcoated. The binder resins for OZ (typically epoxy or moisture-cured urethane) will eventually be deteriorated by the elements. Conversely, in atmospheric exposure, untopcoated IOZ will continue to react with CO2 and water, creating a tighter and more insoluble matrix. Additionally, the cathodic protection and resistance to undercutting corrosion is superior with an IOZ. In order to provide effective cathodic protection, zinc-rich coatings require particle-to-particle zinc contact, which is limited with OZ formulations.

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Tagged categories: Asia Pacific; Coating Application; EMEA (Europe, Middle East and Africa); Latin America; North America; Zinc

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