Tungsten (W) Wire – Hefei Kejing Standard Purity 4N, Diameter 0.01–2 mm
| Brand | Hefei Kejing |
|---|---|
| Origin | Anhui, China |
| Manufacturer Type | Authorized Distributor |
| Origin Classification | Domestic |
| Model | W Wire |
| Pricing | Available Upon Request |
Overview
Tungsten (W) wire is a high-melting-point, high-density refractory metal conductor widely employed in vacuum and high-temperature instrumentation, electron microscopy filaments, thermocouple elements, furnace heating elements, and thin-film deposition targets. Engineered for dimensional stability under thermal cycling and low vapor pressure at elevated temperatures (up to 3,422 °C melting point), this tungsten wire meets the stringent requirements of scientific research, semiconductor processing, and analytical instrument manufacturing. The material exhibits excellent tensile strength, creep resistance, and electron emission characteristics—making it indispensable in applications demanding structural integrity and electrical reliability under extreme conditions.
Key Features
- Purity grade: 99.99% (4N), verified by trace-element analysis per ASTM E1479 and ISO 11885 standards
- Diameter tolerance: ±0.5 µm for wires ≤0.1 mm; ±1% for diameters >0.1 mm, measured via laser micrometry (ISO 13565-2)
- Surface finish: Electrolytically polished and hydrogen-annealed to minimize oxide layer formation and ensure consistent work function
- Handling integrity: Supplied with mechanical protection against bending fatigue and surface abrasion during installation
- Thermal performance: Recrystallization temperature ≥1,200 °C; resistivity at 20 °C: 5.65 µΩ·cm (IEC 60468)
Sample Compatibility & Compliance
This tungsten wire is compatible with standard wire-drawing, ultrasonic cleaning, and high-vacuum brazing processes. It conforms to RoHS Directive 2011/65/EU and REACH Annex XVII restrictions on heavy metals. For regulated laboratory environments—including GLP-compliant materials testing labs and ISO/IEC 17025-accredited calibration facilities—the wire is supplied with full traceability documentation: batch-specific Certificate of Analysis (CoA), elemental impurity profile (ICP-MS data), and dimensional verification report. Packaging complies with ISO 14644-1 Class 1000 cleanroom requirements, with secondary containment in ISO Class 100 polyethylene bags sealed under nitrogen and wrapped in double-layer aluminum foil to prevent moisture absorption and surface oxidation.
Software & Data Management
As a passive component, tungsten wire does not incorporate embedded electronics or firmware. However, its metrological specifications are fully integrable into enterprise quality management systems (QMS) such as TrackWise or MasterControl. Batch-level CoA data can be imported via CSV or XML into LIMS platforms supporting ASTM E1578 metadata schemas. All documentation adheres to FDA 21 CFR Part 11 requirements for electronic records—ensuring audit trails, user authentication, and version-controlled revision history for regulatory submissions.
Applications
- Electron gun filaments in SEM, TEM, and field-emission instruments
- Heating elements in high-temperature tube furnaces (operating range: 1,600–2,200 °C in inert or reducing atmospheres)
- Reference electrodes and microelectrodes in electrochemical impedance spectroscopy (EIS) cells
- Substrate heaters and shadow masks in physical vapor deposition (PVD) systems
- Thermocouple legs (Type W/Re) for ultra-high-temperature measurement in aerospace propulsion testing
- Wire mesh filters and sputtering targets for thin-film optical coatings
FAQ
What is the maximum continuous operating temperature for this tungsten wire in vacuum?
In high-vacuum environments (<1×10⁻⁵ Pa), continuous operation up to 2,400 °C is achievable with appropriate current density control and thermal shielding.
Can this wire be used in oxidizing atmospheres?
No—tungsten oxidizes rapidly above 500 °C in air; use only in inert (Ar, N₂), reducing (H₂), or high-vacuum conditions.
Is custom diameter or spool length available?
Yes—custom diameters within 0.005–3.0 mm and spool lengths from 1 m to 500 m are available upon engineering review and minimum order quantity agreement.
Do you provide mechanical test reports (e.g., tensile strength, elongation)?
Yes—tensile data per ASTM E8/E8M is included in the CoA for batches exceeding 5 kg; smaller lots may be tested upon request.
How is traceability maintained across production batches?
Each coil is laser-marked with a unique batch ID linked to raw-material mill certificates, annealing logs, and final inspection records archived for ≥10 years.
