How Large an Area Can Be Sprayed with 1kg of Cold galvanizing Coating?
Release time：
Apr 02,2025
The area that 1kg of cold galvanizing compound coating can be sprayed on is mainly determined by three core parameters: dry film thickness, volume solid content, and construction loss rate.
The area that 1kg of cold galvanizing compound coating can be sprayed on is mainly determined by three core parameters: dry film thickness, volume solid content, and construction loss rate. According to the industry's general calculation formula and actual parameters, the specific calculation is as follows:
1. Theoretical Coating Rate Calculation
Calculation formula :
Theoretical coating rate (m²/kg) = (volume solid content × 10) / (dry film thickness × coating density)
Volume solid content: The proportion of effective film-forming substances in cold-dip galvanizing paint (usually 60%-80%).
Dry film thickness: The recommended anti-corrosion film thickness is generally 40-120μm.
Coating density: The density of cold-dip galvanizing is about 2.8kg/L.
2. Area Reference Under Different Film Thicknesses
Thick coating anticorrosion (80μm) :
The theoretical coating rate is about 2.0-2.5m²/kg.
Standard anticorrosion (60μm) :
The theoretical coating rate is about 3.0-3.5m²/kg .
Thin coating application (40μm) :
The theoretical coating rate can reach 3.5-4m²/kg .
III. Precautions
1. Influence of zinc content : Cold-dip galvanized coatings with zinc powder content below 96% may result in reduced anti-corrosion performance, so products with high zinc content should be given priority .
2. The actual construction needs to consider the loss rate ( usually 20%-40%, related to the construction method and substrate shape).
3. Construction verification : It is recommended to confirm the actual amount through a small area test spray to avoid large deviations between the theoretical value and the actual value .
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