 The dielectric in solution is screen-printed and dried in 10 μm layers, alternating with 1 μm aluminum plates (used to apply the working 3500 V).EEStor's US patent 7033406 mentions aluminum oxide and calcium magnesium aluminosilicate glass as coatings, although their subsequent US patent 7466536 mentions only aluminum oxide.Nickel was mentioned in the earlier US patent as the electrode but the later patent uses 1 μm aluminum plates as a less expensive alternative.