Overview
Tungsten wire is a specialized form of tungsten metal drawn into thin, flexible strands. It is prized for its unparalleled combination of high melting point, mechanical strength, and electrical conductivity. This makes it indispensable in applications requiring durability under extreme thermal and electrical conditions. Historically, tungsten wire gained prominence as the filament material in incandescent light bulbs due to its ability to withstand high temperatures without melting. Today, its applications span multiple industries, from aerospace to semiconductor manufacturing.
Physical and Chemical Properties
Tungsten wire exhibits exceptional physical properties, including a density of 19.25 g/cm³ and a melting point of 3422°C, the highest of all metals. Its tensile strength surpasses most materials, even at elevated temperatures, making it ideal for high-stress environments. Chemically, tungsten is highly resistant to corrosion and oxidation, though it can react with strong oxidizers at high temperatures. Its electrical conductivity is approximately 30% that of copper, but its thermal stability allows it to outperform copper in high-temperature applications.
Main Applications
The primary use of tungsten wire is in lighting, where it serves as filaments in halogen lamps and incandescent bulbs. Its ability to glow without melting at high temperatures ensures long-lasting performance. In electronics, tungsten wire is used for lead frames, semiconductor substrates, and heating elements in vacuum furnaces. Its high strength-to-weight ratio also makes it valuable in aerospace for components like rocket nozzles and electrical contacts.
Safety and Storage
While tungsten wire is generally stable, its fine dust can pose respiratory hazards if inhaled. Proper handling with gloves and masks is recommended, especially during cutting or machining. Storage should be in a dry, cool environment to prevent oxidation. Bulk tungsten wire is typically coiled and packed in moisture-resistant containers to maintain its integrity during transport and long-term storage.
B2B Procurement Guide
When sourcing tungsten wire, prioritize suppliers with ISO certifications and a proven track record in metallurgical products. Key specifications to verify include purity (minimum 99.95%), diameter tolerance (±1-2%), and surface finish (smooth, free of cracks). For specialized applications like semiconductor manufacturing, request material test reports (MTRs) to confirm traceability and compliance with industry standards. Bulk buyers should negotiate pricing based on volume, with discounts typically available for orders exceeding 100 kg.
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