C5020 is an unfritted lead, gold conductor. It is designed for application on top of a gold-based layer to increase thickness and solderability.In a single print and fire application on a gold base layer it yields a thick, dense film that is free from blisters, cracks, and other cosmetic defects.C5020 has good adhesion when printed over a gold base layer of Heraeus Au conductors. It is not designed to be used without a gold base layer.