Ask the Expert Question-and-Answer Archive by Ron Joseph December, 2007 Calculating Thickness Q: If I know the dry film amount in grams on a known sq. ft. substrate and I know the volume solids and density, how do I calculate the mil thickness? A: You can calculate the film thickness from the algorithm: Coverage (ft2) = 1604 x Gals x Fraction Volume Solids                               Dry film thickness (mils) Where 1604 is the coverage of 1 gallon of solids applied to a film thickness of 1 mil (= 0.001 inches)Notice that density of the paint is not required for this calculation.Therefore: Dry film thickness (mils) = 1604 x Gals x Fraction Volume Solids                                                        Coverage (ft2) Gals = Weight (lbs)          Density (lbs/gal) Therefore, substituting for Gals: Dry film thickness (mils) = 1604 x Weight (lbs) x Fraction Volume Solids                                             Density (lbs/gal) x Coverage (ft2) Since 1 lb = 453.6 grams Dry film thickness (mils) = 1604 x 453.6 x Weight (grams) x Fraction Volume Solids                                                  Density (lbs/gal) x Coverage (ft2) Regards, Ron Joseph

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