Use of Auto-Catalytic Coating on Polycarbonate Plastic As an Electrical Fuse
Original Publication Date: 1985-Jul-01
Included in the Prior Art Database: 2005-Feb-19
A technique is described whereby an auto-catalytic (electroless plating) metal coating is applied onto polycarbonate plastic material, such as LEXAN 920A* or similar plastic material. In the case of the IBM PCjr, this metal coating substrate provides the required electromagnetic-interference (EMI) shielding. The auto-catalytic metal coating, such as a copper-nickel composition, is applied at a controlled thickness, approximately 50 millionths of an inch. Should a live wire carrying 30 amps or more come into contact with the coated plastic, the metal coating will burn away in the area of contact. As a result, the live wire is isolated which prohibits electrical current from passing to the rest of the metal- coated covers. * Trademark of General Electric Corp.