Swiss Shield Naturell Ultra Fabric - Sample Size 6in x 6in

Swiss Shield Naturell Ultra Fabric - Sample Size 15 cm x 12 cm

$22.00
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Product Overview

Swiss Shield Naturell Ultra is the conductive, groundable member of the Swiss Shield cotton range. As well as reflecting high-frequency (HF) radiation like the standard Naturell, its silver/copper filament is carbon-coated so the fabric is electrically conductive — when grounded, it also reduces low-frequency (LF) electric fields from household wiring and appliances.

It delivers around 41 dB of HF shielding at 900 MHz (full per-frequency table below) in a semi-transparent grey cotton weave that works as window and wall curtains, bed canopies or room dividers. Manufactured in Switzerland with a patented high-tech yarn.

This listing is for a sample swatch (approximately 15 cm x 12 cm) so you can check the fabric's shielding, colour, weave and feel before ordering by the metre. Naturell Ultra is the only Swiss Shield fabric that is externally conductive, allowing it to be grounded for LF field reduction. The full fabric is sold by the linear metre (250 cm / 98.4 in wide) on our main listing.

Key Features

Shields both HF radiation and, when grounded, LF electric fields — the dual-protection option in the range
Approximately 41 dB shielding attenuation at 900 MHz, verified up to 9.5 GHz
Externally conductive, groundable surface (carbon-coated silver/copper filament)
Semi-transparent grey cotton weave — decorative and light-passing
Machine washable with no loss of shielding
OEKO-TEX Standard 100, Class 1 certified — skin-friendly and free from harmful substances
Designed and manufactured in Switzerland with a patented high-tech yarn
Full fabric is 250 cm wide for seamless coverage

Technical Specifications

Dimensions

Sample size: approximately 15 cm x 12 cm

Full fabric width: 250 cm (98.4 in), ±2 cm, sold by the linear metre

Materials

Composition: 81% cotton, 18% copper/silver, 1% carbon

Construction: cotton fibre spun with a 0.02 mm silvered-copper thread, carbon-coated for conductivity

Colour: grey, semi-transparent

Weight: 117 g/m²

Dimensional stability: ±3%

Shielding Performance

High-frequency (HF) shielding attenuation, measured across 900 MHz to 9.5 GHz:

900 MHz (GSM): 41 dB
1.8 GHz (GSM): 37 dB
2.45 GHz (Bluetooth / Wi-Fi): 33 dB
5.8 GHz (Wi-Fi): 26 dB
9.5 GHz (X-band radar): 22 dB

Surface: externally conductive (carbon-coated); can be grounded to also shield low-frequency (LF) electric fields

Certification

OEKO-TEX Standard 100, Class 1 — tested for harmful substances; verified by the Swiss Textile Research institute (STR) and the University of the Federal Armed Forces, Munich.

Grounding

Unlike the other Swiss Shield fabrics, Naturell Ultra is externally conductive and should be grounded to realise its full benefit. Grounding drains static and allows the fabric to shield low-frequency (LF) electric fields in addition to HF radiation. Use a proper grounding kit and, ideally, verify the result with a body-voltage or field meter. If you are unsure, consult a qualified EMR technician.

Care Instructions

Machine wash on a gentle cycle in cold water
Iron without steam on the lowest temperature setting
Do not bleach
No chemical dry cleaning
Hang to dry — do not tumble dry

Applications

Test shielding, colour and feel before buying a full roll
Window and wall curtains where both HF and grounded LF shielding are wanted
Bed canopies for a lower-field sleeping environment
Room dividers and wall hangings
Industrial and technical shielding

Safety information: This fabric is electrically conductive and flammable. Keep it away from exposed electrical outlets, wiring and open flames, and ensure any grounding connection is made safely.