YSHIELD M6L-9X magnetic shielding film

Declared attenuation

Each figure is the manufacturer's declaration for the frequency and the layer or coat count named next to it. The percentage is computed from the dB value, not quoted separately.

power frequency (50/60 Hz) magnetic field, single layer

20 dB — removes 90.0% of the field amplitude

power frequency (50/60 Hz) magnetic field, two layers

26 dB — removes 95.0% of the field amplitude

power frequency (50/60 Hz) magnetic field, three layers

30 dB — removes 96.8% of the field amplitude

power frequency (50/60 Hz) magnetic field, four layers

33 dB — removes 97.8% of the field amplitude

Test method

Manufacturer-declared magnetic-field attenuation per layer count with the corresponding percentage reduction in field amplitude; amplitude ratios, not power ratios.

Construction

Six-layer high-permeability alloy film laminated on both sides for use as an intermediate layer in walls, roofs and floors.

Typical application

• Intermediate layer in wall, roof or floor build-ups
• Shielding a room from a transformer or busbar on the other side of a wall
• Vehicle and industrial installations

What the figure does not cover

• Diverts flux rather than blocking it: the film has to be between the source and the occupied space, and a partial panel leaves the field around its edges
• Diminishing returns with layers — four layers add 13 dB over one, so the geometry and the distance to the source matter more than stacking material
• Kinking, folding or mechanical shock reduces permeability permanently and invisibly
• Declared per flat layer in a laboratory fixture; an installed result has to be verified with a gaussmeter before and after
• No RF claim: this is a power-frequency magnetic-field product

What these figures are

Every attenuation value on this page is the manufacturer's own declaration for a flat sample in a test fixture, reproduced so that products can be compared on the same terms. It is not a regulatory limit, not an independent test, and not a prediction of what a meter will read after installation — an installed shield is set by its weakest path, so the only figure that describes a room is a before-and-after measurement of that room.

Related records

• High-permeability alloy (mu-metal) magnetic shielding

  The only material class that meaningfully attenuates power-frequency magnetic fields, and even then typically by a factor of two to five in a retrofit — which is why distance and source correction are preferred.

  Shielding & remediation

• Shielding attenuation

  Decibels of field reduction provided by a material. Every 10 dB is a factor of 10 in power density: 30 dB removes 99.9%, 10 dB removes 90%.

  Quantities & units

• Magnetic flux density

  The quantity an ELF gaussmeter reports, expressed in milligauss or microtesla, used to assess wiring, transformers and power lines. 1 µT = 10 mG.

  Quantities & units

Sources

1. yshield-product-overview YSHIELD product overview with technical data and shielding attenuation — YSHIELD GmbH & Co. KG, 2026. manufacturer, link checked 2026-08-12.