# WM-CS300 copper shielding fabric

> Light copper- and nickel-metallised polyester non-woven declared at up to 65 dB across 30 MHz to 20 GHz with up to 0.1 Ω surface resistivity, air-permeable and used as a technical shielding layer rather than a finished shield.

- Canonical URL: https://emfbase.com/materials/woremor-wm-cs300
- Collection: Shielding products
- Record id: `materials:woremor-wm-cs300`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/materials/woremor-wm-cs300
- Also known as: WM-CS300, MFT-300, copper shielding fabric

## Key values

- **Manufacturer:** WOREMOR
- **Model:** WM-CS300
- **Material class:** Metallised shielding fabric (silver or copper on polyester)
- **Fields addressed:** radiofrequency, elf electric
- **Grounding required:** No
- **Surface resistance:** up to 0.1 Ω surface resistivity

## 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.

- **30 MHz – 20 GHz, single layer, manufacturer's stated maximum** — 65 dB — removes 100.000% of the incident power density (1 part in 3,162,278 gets through)

## Test method

Manufacturer-declared band figure; WOREMOR states attenuation values apply at 1 GHz with measurement to ASTM D4935-10 or IEEE Std 299-2006 unless a band is named.

## Construction

Non-woven polyester (MILIFE) with copper/nickel metallisation and a surface finish, 37 ± 1 g/m², 7 ± 1 g/m² deposited metal, tensile strength 100 MD / 65 CD N per 50 mm, 1 m wide.

## Typical application

- Technical shielding layers in apparel, electronics and vehicles
- Healthcare and architectural assemblies
- Intermediate layer where weight and air permeability matter

## What the figure does not cover

- “Up to 65 dB” is a band maximum, not a value that holds across 30 MHz to 20 GHz, and no per-frequency curve is published with it
- At 37 g/m² the material is a thin non-woven; handling damage reduces attenuation invisibly
- The manufacturer states anti-corrosive treatment, but a metallised coating still abrades, so long-term performance is not the declared performance
- A technical layer rather than a finished shield: it needs conductive joining and an enclosure design to reach anything like the declared figure

## 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.

## Where to buy

[EMR Shielding Solutions](https://www.emrss.com/products/woremor-mft-300-copper-shielding-fabric-width-1m) (rel: nofollow noopener)

EMR Shielding Solutions is a related company of WebKMS, which publishes EMFBase, and sells this product. The link is a stockist listing only: every figure on this page comes from the manufacturer's own documentation, and no specification, limitation or citation depends on it.

## Related records

- [Metallised shielding fabric (silver or copper on polyester)](https://emfbase.com/shielding/fabric): 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.
- [Shielding attenuation](https://emfbase.com/quantities/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%.

## Sources

- `woremor-wm-cs300` WOREMOR. *WM-CS300 copper/nickel metallised non-woven — technical data*. https://www.woremor.com/products/wm-cs300 — manufacturer, link checked 2026-08-12

Data licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Dataset version 2026.08.1. Retrieved from EMFBase, https://emfbase.com.

This record is reference data, not medical or legal advice. Regulatory limits, scientific guidelines and precautionary values are labelled separately and answer different questions.