Red Flags When Sourcing EMF Shielding Fabrics
Red Flags When Sourcing EMF Shielding Fabrics Red flags when sourcing EMF shielding fabrics include unverifiable attenuation claims, missing test documentation, inconsistent surface resistance readings, and suppliers who cannot name the exact fiber composition or standard they test against. This guide walks buyers through the seven most common warning signs, how to verify each one, and the questions that separate legitimate manufacturers from resellers with copied spec sheets. Key Takeaways Always request third-party test reports with specific decibel (dB) attenuation values, not vague "99% blocking" claims. Verify surface resistance with a multimeter yourself; readings above 5 ohms per square often indicate poor fiber density. Confirm the fabric's fiber type — stainless steel, silver, or copper-nickel — because each behaves differently across frequency ranges. Ask for the exact standard used (ASTM D4935, EN 1149, or IEC 60456) and check whether the lab is accredi...