Electromagnetic Shielding Qualification of Vat-Printed Conductive Composites: Shielding Effectiveness, Frequency, Thickness and Anisotropy
Segurola, Juan
2026-08-21 · Informe · Versión 1.3
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Electrically functional photopolymers are increasingly used to create geometrically complex components for electronics, sensing and radio-frequency research, but electromagnetic shielding is often inferred too early from conductivity measurements. This Engineering Review separates the formation of a conductive network from the evidence required for an EMI-shielding claim. Shielding effectiveness is treated as a frequency-, thickness-, geometry- and orientation-dependent response measured through transmission/reflection methods rather than as an intrinsic extension of DC conductivity. ASTM D4935-18(2026) is positioned as a planar far-field method over its stated frequency range, while higher-frequency waveguide and coaxial measurements require explicit fixture and sample descriptions [1,2]. Published additive-manufacturing studies demonstrate that infill architecture, conductive-filler orientation, cellular geometry and printing direction can materially change shielding behaviour even when feedstock chemistry is unchanged [3-6]. VPP-specific literature adds a second constraint: silver nanowires, carbon nanomaterials and conductive polymers can create electrically functional photopolymers, but dispersion, optical attenuation, cure depth, viscosity, post-cure and drying can alter the realised network [7-11]. The review proposes a minimum qualification framework covering S-parameters, total shielding effectiveness, reflection and absorption terms, specimen thickness, density, orientation, conditioning and enclosure-level verification. Current 3Dresyns conductive materials are included only as commercial implementation examples; their electrical positioning does not constitute an EMI-shielding result without frequency-resolved measurement. The objective is to provide a defensible route from printable conductivity to validated shielding performance.