{
  "id": "materials:woremor-ultima",
  "collection": "materials",
  "slug": "woremor-ultima",
  "name": "ULTIMA shielding fabric",
  "summary": "Densely woven cotton fabric with copper and silver declared at 41 dB single layer and 54 dB two layers at 1 GHz, the tighter-woven version of NATURELL and equally non-conductive as a surface.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "aliases": [
      "Ultima",
      "Swiss Shield Ultima"
    ],
    "manufacturer": "WOREMOR",
    "model": "ULTIMA",
    "materialClass": "shielding-fabric",
    "targets": [
      "radiofrequency"
    ],
    "attenuation": [
      {
        "db": 41,
        "frequency": "1 GHz",
        "configuration": "single layer, flat sample",
        "quantity": "power-density"
      },
      {
        "db": 54,
        "frequency": "1 GHz",
        "configuration": "two layers",
        "quantity": "power-density"
      }
    ],
    "testMethod": "Manufacturer-declared at 1 GHz, measured to ASTM D4935-10 or IEEE Std 299-2006, with a screening report per material.",
    "construction": "82% cotton, 17% copper, 1% silver, 70 g/m², 250 cm wide, tighter weave than NATURELL.",
    "requiresGrounding": false,
    "application": [
      "Curtains",
      "Bed canopies",
      "Room dividers"
    ],
    "limitations": [
      "3 dB above NATURELL at the same frequency — a factor of two in power, which is far less than a single gap in the installation costs",
      "Not conductive as a surface: no grounding, and no effect on low-frequency electric fields",
      "Reflective, so a partly enclosed space containing a transmitter can read higher inside",
      "Declared on a flat sample; drape, folds and closures are what decide the installed result"
    ],
    "availability": {
      "vendor": "EMR Shielding Solutions",
      "url": "https://www.emrss.com/products/swiss-shield-ultima",
      "relationship": "owned"
    },
    "related": [
      "shielding:fabric",
      "quantities:attenuation"
    ]
  },
  "sources": [
    {
      "id": "woremor-ultima",
      "title": "ULTIMA shielding fabric — technical data",
      "publisher": "WOREMOR",
      "url": "https://www.woremor.com/products/swiss-shield-shielding-fabric-ultima-hf-width-250-cm",
      "kind": "manufacturer",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/materials/woremor-ultima",
    "html": "https://emfbase.com/materials/woremor-ultima",
    "markdown": "https://emfbase.com/materials/woremor-ultima.md",
    "collection": "https://emfbase.com/api/materials"
  }
}