Dry film thickness (DFT), also known simply as coating thickness, refers to the depth or height of a coating layer after it has dried and cured.
Based on the provided reference, dry film thickness (DFT) is arguably the single most important measurement made during the application and inspection of protective coatings.
Coatings are specifically designed to perform their intended function, such as protection against corrosion or wear, only when they are applied within the specific DFT range recommended by the manufacturer. Applying a coating too thinly or too thickly can compromise its performance and lifespan.
Why is DFT Measurement Crucial?
Measuring DFT is critical for several reasons:
- Performance: Ensures the coating provides the expected level of protection and durability.
- Cost: Applying the correct thickness avoids wasting material (too thick) and potential failures requiring rework (too thin).
- Compliance: Many specifications, standards, and manufacturer guidelines require coatings to meet a specific DFT range.
Understanding and controlling DFT is fundamental to achieving successful and long-lasting coating applications in various industries.
