Cho-shield 604 and Cho-shield 571 are highly conductive materials suited for high volume applications and are applied using precise spray equipment to coat the target surface. Cho-shield 604 is a one component sliver-filled polyurethane material that achieves shielding effectiveness in the region of 100 dB (10 to10,000 MHz) and 80 dB at higher frequencies (10 -18 GHz). Cho-shield 571 meanwhile is a two-component silver-filled epoxy with shielding performance that can reach in excess of 120 dB (10 to 10,000 MHz) and 100 dB (10 – 18 GHz). Maximum surface resistivity for both materials is 10 milliohms / square at one mil. Both materials are flexible and offer a high degree of environmental stability. This helps it achieve an especially strong bond with component surfaces. Wave solder temperatures in excess 262°C can be withstood by both materials, and they have a continuous upper operating temperature of +85°C.
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