What is Dry Film Thickness(DFT)? How to calculate DFT?

 Dry film thickness (DFT) is the thickness of a coating as measured above the substrate. This can consist of a single layer or multiple layers. DFT is measured for cured coatings (after the coating dries). 

The standards concerning DFT measurements include:

• ISO 2808
• BS 3900 Part C5
• BS 5494
• ASTM D1005
• SIS 184160

How to measure DFT?

Well, the formula of DFT is 

            

               WFT * Vs

DFT=------------------------

           100+%Thinning 

 For example, Your applied paint Vs-50%, WFT- 120 microns, Thinning- 10%

So, DFT=(120*50)/(100+10) 

           = 54.5 microns 

Picture: Measuring DFT of applied Anti corrosive Primer (1st coat) using PosiTector.