{
  "id": "materials:woremor-naturell",
  "collection": "materials",
  "slug": "woremor-naturell",
  "name": "NATURELL shielding fabric",
  "summary": "Semi-transparent cotton fabric with woven-in copper and silver declared at 38 dB single layer and 53 dB two layers at 1 GHz, not electrically conductive as a surface and therefore no use against low-frequency electric fields.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "aliases": [
      "Naturell",
      "Swiss Shield Naturell",
      "shielding curtain fabric"
    ],
    "manufacturer": "WOREMOR",
    "model": "NATURELL",
    "materialClass": "shielding-fabric",
    "targets": [
      "radiofrequency"
    ],
    "attenuation": [
      {
        "db": 38,
        "frequency": "1 GHz",
        "configuration": "single layer, flat sample",
        "quantity": "power-density"
      },
      {
        "db": 53,
        "frequency": "1 GHz",
        "configuration": "two layers",
        "quantity": "power-density"
      }
    ],
    "testMethod": "Manufacturer states all attenuation values apply at 1 GHz, measured to ASTM D4935-10, IEEE Std 299-2006, IEEE Std 1128-1998 or ASTM A698/A698M-07, with a screening report published per material.",
    "construction": "82% cotton, 17% copper, 1% silver, 70 g/m², 250 cm wide, certified to Öko-Tex 100 and 1000.",
    "requiresGrounding": false,
    "application": [
      "Curtains",
      "Bed canopies",
      "Window coverings",
      "Room dividers"
    ],
    "limitations": [
      "Not electrically conductive as a surface, so it cannot be grounded and does nothing for low-frequency electric fields, which need a separate measure",
      "A curtain or canopy is only as good as its closure: an open edge or a gap at the floor can leave the measured level barely changed",
      "Reflective rather than absorbing, so an enclosure with a transmitter inside it can measure higher inside than outside",
      "Repeated washing and creasing degrade the woven metal, and the declared figure assumes a flat unwashed sample"
    ],
    "availability": {
      "vendor": "EMR Shielding Solutions",
      "url": "https://www.emrss.com/products/swiss-shield-naturell",
      "relationship": "owned"
    },
    "related": [
      "shielding:fabric",
      "quantities:attenuation",
      "protocols:shielding-verification"
    ]
  },
  "sources": [
    {
      "id": "woremor-naturell",
      "title": "NATURELL shielding fabric — technical data",
      "publisher": "WOREMOR",
      "url": "https://www.woremor.com/products/emf-shielding-fabric-naturell",
      "kind": "manufacturer",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/materials/woremor-naturell",
    "html": "https://emfbase.com/materials/woremor-naturell",
    "markdown": "https://emfbase.com/materials/woremor-naturell.md",
    "collection": "https://emfbase.com/api/materials"
  }
}