Metal fiber

Overview

Fine metallic filaments, shaved fibers or metal-containing yarn structures. Coated plastic metallic yarn is a different construction.

Feel and behavior

Can be conductive, reflective or structurally stiff.

Where you find it

Conductive textiles, shielding, decoration and filtration.

Source and geography

Metal fibers and threads come from mined and refined metals: stainless steel, copper, silver, gold and their alloys. Modern technical forms are mainly stainless steel filaments and staple, silver-plated polymer or cellulose yarns, and fine copper wires, used for conductivity, static control and shielding. Historic metal threads were made from gold, gilt silver, silver and copper alloys, as flat strips, wires, or strips wrapped around a silk, linen, wool or cotton core. Many decorative 'metallic' yarns today are metallized plastic film, a separate construction.

Worth knowing

• Touchscreen gloves work by conducting the charge of the wearer's own finger through the glove rather than generating any signal themselves.
• Most decorative 'metallic' yarns carry only a thin metal or colored coating on polymer film, so a sparkly knit can be almost entirely plastic.

Types, grades and fabrics

Types and grades

Modern metal textile fibers fall into several groups. Stainless steel is drawn into fine filament bundles or cut into staple and blended with cotton or polyester; suppliers commonly cite 316L grade for conductive blends. Silver-plated nylon or polyester yarns carry a thin metal skin on a polymer core. Fine copper and silver-copper wires are wrapped or plied with textile yarns. Decorative metallic yarns are mostly metallized or colored polymer film slit into narrow strips, which contain very little metal. Historic metal threads, from gilt silver strip to copper wire wrapped on silk or cotton, form a separate conservation category.

Fabrics and products

Conductive yarn knitted into the thumb and fingertips of gloves lets them work touchscreens, which sense the capacitance of a finger. Stainless steel blend yarns form grids in antistatic workwear, cleanroom garments and conveyor fabrics, and cores in some cut-resistant glove yarns. Silver-plated knits make electrodes in heart rate straps and wearable sensors, and radio frequency shielding pouches, curtains and garments. Stainless multi-ply thread is sewn as circuits in e-textile projects. Metallic film yarns add sparkle to lame, brocade and knitwear, and metal fiber felts serve as industrial filters.

Buying and care

How to judge quality

For touchscreen gloves, check that conductive yarn is knitted through the fingertip, including the side of the finger, rather than a painted or printed patch, which wears off quickly. For conductive thread or fabric, ask for resistance per meter or per square and whether it is stable after washing. For shielding products, look for attenuation figures in decibels with the frequency range and test method. Red flags include 'copper-infused' or 'silver' claims without a content label or test report, and metallic-look yarns sold as solid metal.

Care in detail

Hand wash or use a gentle cycle in a laundry bag for touchscreen and conductive gloves, with mild detergent and no bleach, which can corrode silver and copper. Avoid fabric softeners that can coat conductive fibers. Air dry or tumble on low. For e-textile garments, remove batteries and electronics before washing as the maker directs. Metallic film yarns can melt or dull under a hot iron, so iron on low from the reverse side with a press cloth if the label allows. Historic metal threads should not be cleaned or polished at home; a textile conservator should assess them.

Care at a glance

Use the manufacturer’s application-specific maintenance and handling instructions. Technical performance cannot be inferred from household laundry guidance.

Environmental and social footprint

Metal fibers carry the footprint of mining and refining, although the mass used in textiles is small. The better-studied concern is release during use: silver-treated textiles shed silver particles in laundering, adding to wastewater loads, which is why antimicrobial silver claims are regulated as biocides or pesticides in some jurisdictions. Metallized film yarns are mainly polyester or nylon with thin aluminum or colored coatings, and they behave like other plastic yarns in waste. Garments with metal yarns, sensors or conductive tracks are hard to sort and recycle, and e-textiles add small electronics to the textile waste stream.

Tradeoffs

Evaluate the specified grade, whole product, useful lifetime and realistic recovery route. A technical property does not establish a lower overall impact.

A useful question to ask: What exact material, product form and documented producer stand behind this name?

Science

Data sheet

Inorganic material

Composition, filament size and product form determine properties and handling.

Structure and chemistry

Metal fibers are polycrystalline metals, not polymers, so they are ductile, dense and electrically and thermally conductive. Historic threads take three main forms: flat strips (lamellae), round wires, and combined threads in which a metal strip is wrapped spirally around a textile core, called srma in Croatian collections. Gilt silver threads have a silver base under a thin gold layer; studies of 13th to 17th century textiles measured gold coatings of about 70 to 400 nm, and an 18th century French thread carried a coating of roughly 80 percent gold and 20 percent silver on nearly pure silver.

From source to yarn

Stainless steel fiber is made by drawing wire down to fine diameters, often as bundles, or by shaving from foil or bar; filaments are then blended into staple yarns or twisted with polymer yarns into core or hybrid yarns. Silver and copper coatings are applied to polymer or cellulose fibers by electroless plating, which needs surface treatments such as silane coupling layers to survive washing. Historic gilt silver thread was made by gilding silver, then working it into wire or strips; cross-sections of medieval threads prepared by focused ion beam milling show the gold was joined by diffusion bonding, without mercury.

Performance in use

Metal fibers conduct electricity, dissipate static and shield electromagnetic radiation; in cut-protective fabrics combining high-performance polyethylene, polyester and stainless filaments of 30 to 50 micrometers, shielding depended strongly on the metal filament diameter. They add weight and stiffness, can break and poke through, and silver and copper tarnish or corrode. Silver-treated textiles are antibacterial, but laundering releases silver: in one study every silver-treated fabric, conventional or nano, shed silver particles into wash water. A silane-bonded silver fabric stayed conductive and 92.82 percent antibacterial after 200 washes.

How it is identified

Burn tests are indicative only: metal filaments do not burn, while any polymer core or blend partner burns away and the metal remains. A magnet attracts some steel fibers but not austenitic stainless steel, silver or copper, so it is not conclusive. A resistance meter reveals conductive yarns. Scanning electron microscopy with energy-dispersive X-ray analysis, with cross-sections, identifies metal composition and layering and is the method recommended for historic metal threads, whose textile cores are identified by light microscopy.

History

Timeline

1. Medieval periodGilt silver threads were made by gilding silver and joining the gold by diffusion bonding; focused ion beam cross-sections detected no mercury. [2]
2. 17th to 20th centuriesIn Croatian collections, threads shifted from gilded silver on silk toward cheaper silver, copper and alloy threads, with copper on cotton cores predominating in more recent pieces. [3]
3. 2014Laundering tests found that all silver-treated textiles studied, conventional or nano-silver, released silver particles into wash water. [4]
4. 2021A silane-bonded silver-plated cellulose fabric stayed below 2 ohm/sq and about 92.82% antibacterial after 200 washes, in a study of wearable electrodes. [5]

Metal threads appear in historic luxury textiles; modern metal fibers also serve electrical and industrial functions. The metal, substrate and construction should be named.

The deeper record

Metal threads have decorated high-status textiles for centuries, signaling wealth and authority in liturgical, ceremonial and military dress. Analyses of Croatian textiles trace a long shift: archaeological threads of gilded silver on silk gave way to cheaper silver, copper and alloy threads, and in more recent historical pieces copper, alone or in alloys, predominates, usually on cotton cores, which brought metal decoration into everyday dress. Modern drawn stainless filaments and plated yarns then turned metal fibers into functional components for antistatic, shielding and wearable electronic textiles.

Labeling and law

Labels must name the actual composition: US labels use the applicable generic name for metal fibers from 16 CFR 303.7, and EU labels the fibre name for metal fibres in Annex I of Regulation (EU) No 1007/2011. Terms such as 'silver-infused', 'copper-infused' or 'antimicrobial' describe treatments or components and, in some jurisdictions, antimicrobial claims fall under pesticide or biocide rules; they need test evidence. Metallized plastic yarns should not be presented as solid metal.

This describes what rules and standards cover. It is not legal advice; jurisdiction, product form and current rule text control.

Frequently asked

How do touchscreen gloves work?

Most phone screens are capacitive: they detect the small change in electric field when a conductive finger touches them. Touchscreen gloves knit conductive yarn, usually stainless steel blends or silver-plated nylon, into the fingertip so the charge passes from the skin through the glove.

Why did my touchscreen gloves stop working?

Painted or printed conductive patches wear off, silver coatings can tarnish or abrade, and stiff metal yarns can break. Very thick glove linings can also insulate the fingertip. Gloves with conductive yarn knitted through the fingertip tend to last longer.

Is Lurex real metal?

Most modern metallic yarns, including many sold under familiar trade names, are thin polymer film coated with aluminum or colored layers and slit into narrow strips. They contain little metal and behave like plastic yarns in washing and ironing.

Sources

• Museum of Fine Arts, Boston: CAMEO materials reference
• Analytical Chemistry: Medieval gilding technology of historical metal threads revealed by FIB-milled cross sections (2017)
• Materials: Metal content and structure of textiles in textile metal threads in Croatia from 17th to 20th century (2021)
• Analytical Chemistry: Nondestructive microanalysis of thin-film coatings on historic metal threads (2021)
• ACS Nano: Presence of nanoparticles in wash water from conventional silver and nano-silver textiles (2014)
• International Journal of Biological Macromolecules: Conductive cellulose fabrics with durable antibacterial properties for wearable electrodes (2021)
• US Patent 8,528,117: Gloves for touchscreen use (Justia)
• Gear Patrol: The science behind touchscreen gloves
• SATRA: EN 388, assessing mechanical risks
• International Journal of Occupational Safety and Ergonomics: Electromagnetic shielding behavior of cut-protective workwear with metallic core hybrid yarn (2025)

Cite this page

Chaos. (2026). Metal fiber. In Fibers of Earth: An independent textile atlas. https://www.hendrickresearch.com/fibers/materials/metal/