Relationship Between Epoxy Zinc-rich Primer Coating Rate and Zinc Content

Epoxy zin-crich primer is a commonly used primer in heavy-duty anti-corrosion systems, and it is well known that the anti-corrosion performance of epoxy zin-crich primer is related to the zinc content in the paint. According to the national standard, the zinc content of epoxy zin-crich primer has three grades: 60%, 70%, and 80%. In addition, some customers customize the proportion of zinc-containing paint. The coverage rate of epoxy zin-crich primer with different zinc content is different. Below, we will examine the relationship between the coverage rate and zinc content of epoxy zin-crich primer.

What is the Coverage Rate of Epoxy Zin-crich Primer?

We compare the 70% zinc content with the commonly used 50% zinc content paint. To compare the relationship between the coverage rate and zinc content of these two epoxy zin-crich primers, the factors in the construction need to be determined, such as the construction layers, film thickness, and spraying methods, to determine the relationship between the two.

Determine the Influencing Factors of Epoxy Zin-crich Primer

Both epoxy zin-crich primers require the dry film thickness of the applied paint to be 60μm. As for the construction layers, if airless spraying is adopted, one layer is required, and other methods require 1-2 layers according to requirements. Here, one layer and a wet film of 120μm is standard for comparison. Only in the case where the standard is determined, comparison is meaningful.

Comparison of Epoxy Zin-crich Primer Usage

Under the conditions of the same construction layers and film thickness, the specific gravity of epoxy zin-crich primer with 50% zinc content is 1.88kg/L, which is far lower than the 2.1kg/L of 80% zinc content. The theoretical usage of 50% zinc content epoxy zin-crich primer is 175g per square meter, and the theoretical usage of 80% zinc content epoxy zin-crich primer is 270g per square meter.

Data shows that the lower the zinc content, the lower the specific gravity of the paint, and the less usage per square meter; the higher the zinc content, the higher the specific gravity of the paint, and the more usage per square meter. Correspondingly, the more usage per square meter, the lower the coverage rate.

The Relationship Between Zinc Content and Coverage Rate of Epoxy Zin-crich Primer

From the above analysis, it can be concluded that the coverage rate of epoxy zin-crich primer is inversely proportional to the zinc content. The higher the zinc content, the lower the coverage rate, and the lower the zinc content, the higher the coverage rate.

Although the coverage area is large when the zinc content is low, the anti-corrosion effect of epoxy zin-crich primer is affected by the amount of zinc content. The lower the zinc content, the worse the anti-corrosion effect. Therefore, when purchasing, you should choose the appropriate zinc content of epoxy zin-crich primer according to your anti-corrosion needs. If you have any other questions, you can consult us.