# NATURELL shielding fabric

> 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.

- Canonical URL: https://emfbase.com/materials/woremor-naturell
- Collection: Shielding products
- Record id: `materials:woremor-naturell`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/materials/woremor-naturell
- Also known as: Naturell, Swiss Shield Naturell, shielding curtain fabric

## Key values

- **Manufacturer:** WOREMOR
- **Model:** NATURELL
- **Material class:** Metallised shielding fabric (silver or copper on polyester)
- **Fields addressed:** radiofrequency
- **Grounding required:** No

## 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.

- **1 GHz, single layer, flat sample** — 38 dB — removes 99.984% of the incident power density (1 part in 6,310 gets through)
- **1 GHz, two layers** — 53 dB — removes 99.999% of the incident power density (1 part in 199,526 gets through)

## Test method

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.

## Typical application

- Curtains
- Bed canopies
- Window coverings
- Room dividers

## What the figure does not cover

- 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

## 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/swiss-shield-naturell) (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%.
- [Shielding verification](https://emfbase.com/protocols/shielding-verification): How to prove a shielding measure worked: identical instrument, position and source conditions before and after, reported in dB as well as in absolute units.

## Sources

- `woremor-naturell` WOREMOR. *NATURELL shielding fabric — technical data*. https://www.woremor.com/products/emf-shielding-fabric-naturell — 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.