what is dry film thickness (dft)_ - definition from corrosionpedia
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Definition What does Dry Film Thickness (DFT) mean?Dry film thickness (DFT) is the thickness of a coating as measured above the substrate. This can consist of a single layer ormultiple layers.
DFT is measured for cured coatings (after the coating dries). Thickness of a coating depends on the application and type ofprocess employed. Proper thickness should be determined by recommended coating system parameters.
Corrosionpedia explains Dry Film Thickness (DFT)Coating is the most critical component in an anticorrosive coating system. The main function of coating is to provide corrosionprotection by adhesion to the substrate. It is critical that the applied thickness be sufficient to ensure corrosion protection as wellas proper adhesion.
The maximum coating thickness recommended by a manufacturer is often based on a coating's resistance to sagging (sink). DFTis a parameter that is considered during quality control or inspection processes. Durability of a coating is function of DFT,whereas the thickness of an individual coating layer in a coating system and the total system DFT reported specifies the coating'sdurability.
Types of DFT gages include:
Magnetic pulloff (Type I)Constant pressure probe (Type II)Electronic magnetic fluxEddy current gage
Standards concerning DFT measurements include:
ISO 2808BS 3900 Part C5BS 5494ASTM D1005D1400D2691SIS 184160
Dry Film Thickness (DFT)