carbon coated aluminum tape for Electric double layer capacitor a) Total Width: 250.0 +/-1.0mm b) Free Margin each end 15.0 +/-1.0mm c) Total Thickness: 0.200 +/- 0.020mm d) Al. Foil thickness: 0.20 +/- 0.002mm e) Density of the active layer: 0.61gm/cc - minimum f) Mother Roll Core ID = 76.2mm g) Porosity of Activated Carbon: 0.7cm3/gm h) Purity of Al. Foil: >99.7% i) Specific Capacitance of the Active Layer: 12000f/m2 j) Volume resistivity of the Active layer: 20.0 Ohms - Max.