black tungsten wire

Product Overview

Tungsten wire is one of our advantage products.

The main grades about our tungsten wire are W1, W2.1 and WAL1.

It’s mainly used for making tungsten filament, tungsten heaters, heating components and furnace parts, also used for medical industry and electric light source.

The diameter of our tungsten wire range is from 0.006 and 1.5mm, and the surface is black, polishing and alkali washing.

About tungsten wire, we have rotary swaging and drawing machines, so our cost is low, production time is short, and quality is guaranteed.

Tungsten wire samples are available for testing.

Tungsten wire represents the finest, most heavily processed form of tungsten.

While sharing the extreme physical traits of plates and rods—such as the highest melting point of any metal (3,422°C) and immense density—tungsten wire relies on incredible tensile strength and precise microstructural engineering.

Historically famous as the glowing filament in incandescent light bulbs, tungsten wire has evolved into a vital material for advanced semiconductor testing, solar energy production, medical devices, and high-tech manufacturing.

1. Key Material Classifications

Tungsten wire is tailored at the molecular level through specialized "doping" or alloying to handle extreme tension, high temperatures, or vibration without snapping.

Pure Tungsten Wire (99.95% to 99.999%)

Highly valued for its ultra-low vapor pressure and chemical purity.

It is primarily used in vacuum deposition heaters, electron tube cathodes, and high-precision semiconductor probe pins.

Non-Sag (NS) / Doped Tungsten Wire

Doped with minute amounts of potassium, silicon, and aluminum (Al-Si-K).

When heated past its recrystallization point, this specialized doping forces the metal grains to form an interlocking, elongated structure.

This prevents the wire from drooping, sagging, or deforming under its own weight at high temperatures (crucial for heavy-duty halogen lamps and furnace elements).

Tungsten-Rhenium Alloy Wire (W-Re)

Usually containing 3% to 25% Rhenium.

Adding rhenium dramatically improves the wire’s flexibility (ductility) at room temperature and after high-temperature exposure, while also increasing its electrical resistance.

It is widely used in aerospace thermocouples and severe-vibration environments.

2. Dynamic 2026 Market Conditions

If you are currently sourcing or budgeting for tungsten wire, the market is experiencing a historic structural shift.

Unprecedented Price Surge

Driven by a global supply squeeze, tightening mining quotas, and geopolitical hoarding, raw tungsten powder prices have surged multiple times over.

The Photovoltaic (PV) Boom

The single largest disruptor to the tungsten wire supply chain is the solar industry.

Ultra-fine tungsten wire has rapidly achieved a market penetration rate of over 60% as the preferred core wire for diamond wire slicing (used to cut silicon wafers for solar panels).

Because tungsten wire is stronger than traditional high-carbon steel, it can be drawn incredibly thin, which minimizes wafer waste and saves solar manufacturers millions.

This massive demand has heavily absorbed global wire manufacturing capacity.

3. Surface Finishes & Dimensions

Because drawing a metal as hard as tungsten down to microscopic diameters requires heavy lubrication, the surface finish must be carefully chosen based on the final application.

Surface Finishes

Black Finish

Retains a coating of drawing lubricants and graphite oxides.

This is the standard, economical choice if the wire is going to be mechanically handled or stripped later.

Cleaned Finish (White/Matte)

The graphite and lubricants are chemically etched away via an acid or caustic wash, leaving a clean, matte-gray metallic surface.

Required for vacuum electronics to prevent outgassing.

Polished Finish

Electropolished to a bright, mirror-like shine.

This ensures absolute diameter uniformity and is typically specified for high-precision medical wires and semiconductor testing probes.

Size Spectrum

Tungsten wire can be drawn down to astonishingly microscopic diameters, often measured in micrometers or milligrams per 200 mm (a traditional metallurgical unit of weight used for ultra-fine wires).

Thick structural wire/strands: 0.5 mm to 2.0 mm

Standard industrial wire: 0.1 mm to 0.5 mm

Ultra-fine / Micro-wire (PV & Medical): 20μm down to less than 10μm (thinner than a human hair).

4. Primary Applications

Q: Which surface finish should I choose for my application?

Tungsten wire requires heavy lubricants (like graphite) to be drawn through diamond dies.

The remaining residue dictates the finish.

Black Finish: The wire retains its graphite and oxide drawing coating.

It is the most economical option and provides a layer of surface protection during mechanical handling or twisting into stranded cables.

Cleaned (White/Matte) Finish: The graphite layer is chemically stripped away using caustic or acid washes.

This finish is mandatory for vacuum electronics or furnace elements to prevent the graphite from outgassing and contaminating the vacuum environment.

Electropolished Finish: Chemically polished to a mirror shine.

This yields the smoothest surface and the most uniform diameter, which is essential for medical electrosurgical needles or ultra-fine semiconductor probe needles.

Q: What mechanical tests should I require on the Quality Certificate?

Because wire undergoes intense tension during winding or braiding, your Quality Assurance team should demand:

Tensile Strength & Elongation Tests: Verifies the maximum load the wire can take before snapping.

Straightness / Curl Test: For semiconductor probe pins or automated feeding systems, ask for the "straightness tolerance."

If the wire has too much natural cast or curl from being wound on a spool, it will jam automated machinery.

Torsion / Twist Test: Ensures the wire has no hidden internal longitudinal splits or cracks caused by the drawing process.