Abstract: A viewing panel (30, 40, 50, 60, 70, 80) for a domestic appliance includes a substrate (33, 43, 53, 63, 73, 83) and a conductive layer (35, 45, 55, 65, 75, 85) disposed on the substrate; the conductive layer having conductive lines (31, 41, 51, 61, 71, 81) forming a pattern. The substrate contains a polymeric material; the conductive lines have a height (H) of 0.5 micrometers to 10 micrometers determined by an Olympus MX61 microscope; and the pattern has an average pore area of 0.008 square millimeters to 0.06 square millimeters determined by an Olympus MX61 microscope. The viewing panel has: a total transmission of greater than 70% of light having a wavelength in the range of 360 nanometers to 750 nanometers; and an electromagnetic shielding efficiency of greater than 30 dB at 2.45 GHz.

Abstract: A viewing panel (30, 40, 50, 60, 70, 80) for a domestic appliance comprises a substrate (33, 43, 53, 63, 73, 83) and a conductive layer (35, 45, 55, 65, 75, 85) disposed on the substrate; the conductive layer comprising conductive lines (31, 41, 51, 61, 71, 81) forming a pattern. The viewing panel is characterized in that: the substrate comprises a polymeric material; the conductive lines have a height (H) of 0.5 micrometers to 10 micrometers determined by an Olympus MX61 microscope; and the pattern has an average pore area of 0.008 square millimeters to 0.06 square millimeters determined by an Olympus MX61 microscope; wherein the viewing panel has: a total transmission of greater than 70% of light having a wavelength in the range of 360 nanometers to 750 nanometers; and an electromagnetic shielding efficiency of greater than 30 d B at 2.45 GHz.

Abstract: A method of forming a viewing panel for a microwave oven can comprise: placing a film including a conductive coating into a mold and molding a substrate to a surface of the film having the conductive coating to form the viewing panel; or injection molding a substrate and applying a conductive coating to a surface of the substrate after molding to form the viewing panel; wherein the substrate is selected from a transparent polymer or glass; the conductive coating has an EMI shielding effectiveness of greater than 25 d B from 30 MHz to 3.0 GHz as determined by ASTM D4935; and the viewing panel has a transmittance of greater than or equal to 50% of incident light having a frequency of 430 THz to 790 THz.