How to evaluate the shielding effectiveness of conductive foam in edge computing boxes?

The conductive foam for edge computing boxes is used to fill structural gaps and provide continuous electrical contact. Shielding effectiveness evaluation metrics include volume resistivity <0.1Ω·cm, contact resistance <20mΩ at a compression ratio of 30%, and shielding effectiveness (SE) measured via the flange coaxial method (ASTM D4935). Typical frequencies are 30MHz-1.5GHz. SE >60dB. Application requires ensuring conductive surfaces between the foam and the metal substrate. Oxidation treatment is necessary for bare aluminum; polishing is required for stainless steel substrates. Compression should be controlled at 25%-35%, and rebound force should be moderate. E-Tech Electronics offers various specifications of conductive foam with strong adhesive and aging resistance. Actual testing showed that after application to the gaps between the top and bottom covers of edge computing boxes, the 1GHz shielding effectiveness increased from 12dB to 58dB, and radiated emission improved by 10dB, meeting industry standards.