CL21s are non-inductively wound with metallized polyester film stacked as the dielectric/electrode with copper-clad steel leads and epoxy resin powder coating provides the identical outer appearance. High dv/dt ability due, high capacitance rate. Long life due to self-healing effect. Suitable for blocking , by-pass and coupling of DC and signals to VHF range. Widely used in filter, noise suppression and low pulse circuits.