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Aluminium Foil For Electronic Power Capacitor

Chemical Compositions

Alloy Fe Si Cu Mn Mg Cr Zn Ni Ti Other Al
Each Total
1235 0.65 0.05 0.05 0.05 - 0.1 - 0.06 0.05 0.15 99.35

Application For Electronic Power Capacitor
Alloy 1235
Temper H18,O
Thickness(mm) 0.0045 ,0.005, 0.0055,0.006
Tolerance 0.0045 ±5%
0.006 2%
Tolerance of Width(mm) ±0.5
Core (mm)   Φ75 Φ150
Coil O.D.(mm)   ≤Φ350 ≤Φ550
Core I.D.(mm) Φ76.2 /150/152.4
Splices Width ≤300 300~350 ≤5
Splices ≤1 ≤2
Mechanical Properties MPaU.T.S 55100
% Elongation ≥1.0
Unwinding (m) ≤1
Trace Elements (%) Pb≤0.01, As≤0.01,Cd≤0.01
Pin holes(m2) 0.0045 ≤8000
  0.005 ≤4000
  0.0055 ≤2000
  0.006 ≤1000
Norms & Standards GB3198

This application of aluminum foil employs not only its good electrical conductivity but also its oxide coating, specially formed (anodized) to make a superior dielectric layer between the two conductors. The dielectric constant of aluminum oxide is higher than that of waxed paper and many other dielectric materials, therefore it can store more electrons per unit of area. The oxide dielectric plate, which determines the size of a given capacitor, does not have to be as large as a paper dielectric "plate" for an equal capacity. Further, the oxide film, even a "thick" one, is thinner than the thinnest tissue paper. This thin film of aluminum oxide reduces the bulk of the capacitor; but more important, its thinness also increases the capacitance per unit of area. Another advantage of aluminum foil for electrolytic capacitors is that the foil is readily etched. This is important because etching greatly increases the true surface area which, when anodized, results in a far larger dielectric plate capacity.

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