# ULTIMA shielding fabric

> 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.

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

## Key values

- **Manufacturer:** WOREMOR
- **Model:** ULTIMA
- **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** — 41 dB — removes 99.992% of the incident power density (1 part in 12,589 gets through)
- **1 GHz, two layers** — 54 dB — removes 100.000% of the incident power density (1 part in 251,189 gets through)

## Test method

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.

## Typical application

- Curtains
- Bed canopies
- Room dividers

## What the figure does not cover

- 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

## 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-ultima) (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-ultima` WOREMOR. *ULTIMA shielding fabric — technical data*. https://www.woremor.com/products/swiss-shield-shielding-fabric-ultima-hf-width-250-cm — 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.