Noise reducing sponge is a medium material produced using polymer composite foaming technology, with uniform foaming pore size, softness, elasticity, and no shedding. Its conductivity is stable, the shelf life is long, and it is not affected by temperature and humidity. The surface resistance value can be customized. The uniform distribution and corrosion resistance of conductive sponge make it an ideal material for long-term storage devices. This material is divided into two categories: high-density and low-density, which are respectively used for testing integrated circuits and packaging electronic products that are shock resistant and anti-static. Conductive sponge is widely used in fields such as computers, communication equipment, medical instruments, military industry, and aerospace, playing an important role in EMI shielding and ESD grounding