January 30, 2021

How to Measure Wet Film Thickness using "Eccentric wheel"

Eccentric wheel: Wet film thickness measurement
How to Measure Wet Film Thickness using Eccentric wheel

How to get the reading of WFT?

Wet film thickness (WFT) is a measure of the thickness of a wet coating or paint film. It can be measured using an eccentric wheel, which is a tool that consists of a small wheel mounted on an offset axis. To use an eccentric wheel to measure WFT, you will need to follow these steps:

  1. Prepare the surface to be coated: Make sure that the surface is clean, dry, and free of any contaminants or defects.
  2. Apply the coating: Use a spray gun, brush, or roller to apply the coating to the surface.
  3. Allow the coating to flow: After applying the coating, allow it to flow and level out. This will help ensure that the WFT is consistent across the entire surface.
  4. Measure the WFT: Place the eccentric wheel on the surface of the coating, making sure that the wheel is fully immersed in the wet film. Roll the wheel across the surface, applying a consistent amount of pressure. The WFT is calculated based on the distance traveled by the wheel and the amount of pressure applied.
  5. Record the WFT: Make sure to record the WFT measurements for each area of the surface. This will help you determine whether the coating is applied consistently and to the proper thickness.


It's important to note that the accuracy of the WFT measurement will depend on a number of factors, including the type of coating being applied, the surface being coated, and the skill of the person taking the measurement. To get the most accurate results, it's important to use a well-calibrated eccentric wheel and to follow the manufacturer's instructions for use.

How to Measure Wet Film Thickness using Elcometer Wet Film Eccentric Wheels

The Elcometer 3230 Wet Film Wheel is a high precision, accurate and easy to use instrument which measures the wet film thickness of coatings.


It's important to note that the accuracy of the measurement will depend on the consistency of the coating and the pressure applied to the wheel. It may also be necessary to calibrate the wheel to ensure accurate results.

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