{
  "id": "materials:yshield-m2l",
  "collection": "materials",
  "slug": "yshield-m2l",
  "name": "YSHIELD M2L magnetic shielding film",
  "summary": "Two-layer 0.12 mm magnetic shielding film declared at 12.1 dB single layer rising to 21.7 dB in four layers, quoted by the manufacturer as a field-amplitude reduction of 75.1% to 91.8%.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "aliases": [
      "M2L",
      "magnetic shielding film",
      "mu-metal film"
    ],
    "manufacturer": "YSHIELD GmbH & Co. KG",
    "model": "M2L",
    "materialClass": "shielding-mu-metal",
    "targets": [
      "elf-magnetic"
    ],
    "attenuation": [
      {
        "db": 12.1,
        "frequency": "power frequency (50/60 Hz) magnetic field",
        "configuration": "single layer",
        "quantity": "magnetic-flux-density"
      },
      {
        "db": 16.3,
        "frequency": "power frequency (50/60 Hz) magnetic field",
        "configuration": "two layers",
        "quantity": "magnetic-flux-density"
      },
      {
        "db": 19.5,
        "frequency": "power frequency (50/60 Hz) magnetic field",
        "configuration": "three layers",
        "quantity": "magnetic-flux-density"
      },
      {
        "db": 21.7,
        "frequency": "power frequency (50/60 Hz) magnetic field",
        "configuration": "four layers",
        "quantity": "magnetic-flux-density"
      }
    ],
    "testMethod": "Manufacturer-declared magnetic-field attenuation per layer count, quoted with the corresponding percentage reduction in field amplitude. These are amplitude ratios, not the power ratios used for the same manufacturer's RF products.",
    "construction": "Two-layer high-permeability alloy film protected with laminating foil on both sides, 21 cm wide.",
    "thickness": "0.12 mm",
    "requiresGrounding": false,
    "application": [
      "Local shielding of a transformer, riser or supply cable",
      "Intermediate layer in a wall, floor or ceiling build-up",
      "Shielding a bed head from a known magnetic source"
    ],
    "limitations": [
      "Magnetic shielding works by diverting flux, so a flat film only helps where it sits between the source and the person; it does not enclose a room",
      "12.1 dB is a factor of about four in field, not the thousandfold reduction RF materials are quoted at — magnetic fields at power frequency are the hardest case in shielding",
      "High-permeability alloys lose permeability if kinked, folded, hammered or drilled, and the loss is permanent and invisible",
      "Declared per flat layer in the manufacturer's fixture: geometry, distance and source orientation change the installed result more than layer count does",
      "Nothing here addresses RF; the field type is different and so is the material"
    ],
    "related": [
      "shielding:high-permeability-alloy",
      "quantities:attenuation",
      "quantities:magnetic-flux-density"
    ]
  },
  "sources": [
    {
      "id": "yshield-product-overview",
      "title": "YSHIELD product overview with technical data and shielding attenuation",
      "publisher": "YSHIELD GmbH & Co. KG",
      "url": "https://www.yshield.de/pdf/YSHIELD-Produktuebersicht-Productoverview.pdf",
      "year": 2026,
      "kind": "manufacturer",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/materials/yshield-m2l",
    "html": "https://emfbase.com/materials/yshield-m2l",
    "markdown": "https://emfbase.com/materials/yshield-m2l.md",
    "collection": "https://emfbase.com/api/materials"
  }
}