{
  "id": "shielding:shielding-fabric",
  "collection": "shielding",
  "slug": "fabric",
  "name": "Metallised shielding fabric (silver or copper on polyester)",
  "summary": "Curtains, bed canopies and clothing woven with silver or copper, typically quoted at 30–50 dB across the cellular and Wi-Fi bands — enough to remove 99.9% of incident power density when installed without gaps.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "aliases": [
      "EMF fabric",
      "shielding curtain",
      "bed canopy",
      "faraday fabric"
    ],
    "form": "fabric",
    "attenuation": {
      "value": 30,
      "max": 50,
      "band": "roughly 900 MHz – 6 GHz, datasheet values for flat samples",
      "sourceIds": [
        "sbm-2024"
      ]
    },
    "targets": [
      "radiofrequency"
    ],
    "requiresGrounding": false,
    "failureModes": [
      "Any unclosed gap dominates the result: a canopy left open at one edge can measure barely better than no canopy",
      "Silver coatings degrade with washing, abrasion and perspiration; conductivity loss is invisible",
      "Reflective by design — a partially enclosed space can raise levels inside it if a transmitter is inside the enclosure",
      "Grounding a canopy does nothing for RF and can create a low-frequency electric-field problem if done incorrectly"
    ],
    "related": [
      "quantities:attenuation",
      "protocols:shielding-verification"
    ]
  },
  "sources": [
    {
      "id": "sbm-2024",
      "title": "Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024)",
      "publisher": "Institut für Baubiologie + Nachhaltigkeit (IBN)",
      "url": "https://buildingbiology.com/site/downloads/SBM-2024_EVALUATION_GUIDELINES_EN.pdf",
      "year": 2024,
      "kind": "ngo",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/shielding/fabric",
    "html": "https://emfbase.com/shielding/fabric",
    "markdown": "https://emfbase.com/shielding/fabric.md",
    "collection": "https://emfbase.com/api/shielding"
  }
}