Ask the Expert Question-and-Answer Archive by Ron Joseph July, 2010 Paint Coverage Q. I'm a professional in the coil coating industry. We are using a different formula for paint BOM calculation. One of them is: Coverage(mtr2 / ltr)=(Volume Solid)/(coating thickness in micron:10) Sir, I want clarification of this formula and from where the constant factor 10 comes. Please give me a clarified suggestion. I will be very thankful to you. A. The calculation is provided for the coverage of 1 liter of coil coating when it is deposited at a dry film thickness (DFT) of 10 microns. If you deposit the coating at a different DFT you should change the value in your calculation. 1 liter = 0.001 (m3) 10 microns = 0.000010 (m) Volume (m3) = Length (m) x Width (m) x Height (m) Volume (m3) = Area (m2) x Height (m) Area (m2) = Volume (m3) Height (m) For 1 Liter of 100% solid coating = 0.001 (m3) 0.000010 (m) = 100 (m2) Since your liquid coil coating is not 100% solids, you need to multiply by the fraction volume solids. Suppose your coating is only 30% volume solids, your coverage will be: = 100 (m2) x 0.3 = 30 (m2) when applied at a DFT of 10 microns. Regards, Ron Joseph

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