1. The Importance of Wet Film Thickness

Measuring wet film thickness during coating application is crucial for ensuring the required dry film thickness. It helps identify and correct thickness variations in each applied coat.

2. Relationship Between Wet and Dry Film Thickness

The ratio of dry film thickness to wet film thickness depends on the volume solids (%) of the coating used. These data can be found in the manufacturer’s technical data sheet and are essential for calculations.

3. Formula for Calculating Wet Film Thickness

With the specified dry film thickness and the volume solids of the product, the corresponding wet film thickness can be calculated using the formula:

Wet Film Thickness = Dry Film Thickness / Volume Solids

4. Example Calculation

For a coating with a volume solids content of 75% and a required dry film thickness of 150μm, the minimum wet film thickness can be calculated as:

Wet Film Thickness = Dry Film Thickness / Volume Solids = 150 / 75% = 200μm

Conclusion: The coating must be applied with a wet film thickness of 200μm to meet the requirement.

5. Conclusion

Accurate calculation of wet film thickness is essential for ensuring coating quality and performance. By understanding the relationship between wet and dry film thickness and using the correct formula, the application team can achieve the required dry film thickness, enhancing the coating’s protective properties and durability.