Where:
Finish Add-On = Grams per square foot of finish add-on applied to a representative section of polyester film or equivalent material substrate.
Final Mass = Final mass in grams of representative section of polyester film or equivalent material substrate, after finishing and drying.
Initial Mass = Initial mass in grams of representative section of polyester film or equivalent material substrate, prior to finishing.
Surface Area = Surface area in square feet of a representative section of polyester film or equivalent material substrate.
40 C.F.R. §63.5345