Coating Thickness

What is Coating Thickness

Coating thickness or dry film thickness (DFT) is an important variable that plays a role in product quality, process, and also cost control. Measurement of film thickness can be accomplished by selecting the best mil gage for the particular application.

Why Dry Film Thickness Measurement is Important

Both of Dry film thickness (DFT) or coating thickness is arguably the single most important measurement. Made during the application and inspection of protective coatings. Coatings are designed to perform their intended function when applied within a tight DFT range as specified by the manufacturer. Correct thickness will ensures optimum product performance. Even the most basic specification will require DFT to be measured.

The Measure of Quality

Regular film thickness measurement helps control material costs, manage application efficiency, maintain finish quality and also ensure compliance with contract specifications either. Paint manufacturers recommend target ranges to achieve optimum performance characteristics and clients expect these parameters to be met.

See below for more information about related measurement products and gauges.

Principles of Operation of Paint Thickness Gages

What are the types of Paint Thickness Gages available?
DeFelsko offers a variety of paint meters and probes for a wide range of applications. Including for measuring paint and coatings on metals, non-metals (wood, concrete, plastic, composites), and for measuring uncured powder coating thickness.

Check out our selection of paint thickness meters below.

What are Eddy Current Film Thickness Gages? (Type 2 – Electronic Coating Thickness Gages)

Eddy current techniques are used to nondestructively measure the thickness of nonconductive coatings on nonferrous metal substrates. A coil of fine wire conducting a high-frequency alternating current (above 1 MHz) is used to set up an alternating magnetic field at the surface of the instrument’s probe. When the probe is brought near a conductive surface, the alternating magnetic field will set up eddy currents on the surface. The substrate characteristics and the distance of the probe from the substrate (the thickness) affect the magnitude of the eddy currents. The eddy currents create their own opposing electromagnetic field that can be sensed by the exciting coil or a second, adjacent coil.

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