Overview
Tungsten sheet is a premium refractory metal product manufactured through powder metallurgy or rolling processes. With the highest melting point of all metals (3,422°C), it serves critical roles in extreme environments where other materials fail. Industrial-grade sheets typically range from 0.1mm to 10mm thickness, with ultra-pure (>99.95%) variants used in semiconductor applications. The material's density exceeds lead by 70%, making it effective for radiation shielding in medical and nuclear sectors.
Physical and Chemical Properties
Tungsten's outstanding thermal stability allows operation at temperatures where most metals melt. Its thermal conductivity (173 W/m·K at 20°C) surpasses many steels, while its low thermal expansion coefficient ensures dimensional stability. The metal forms a protective oxide layer at high temperatures but reacts with fluorine at room temperature. It resists attacks from most acids, though aqua regia and hydrogen peroxide mixtures can cause corrosion. Electrical resistivity (52.8 nΩ·m) is higher than copper but remains stable under thermal stress.
Main Applications
In aerospace, tungsten sheets function as heat shields and counterweights in turbine engines. The electronics industry utilizes thin foils for X-ray targets and diffusion barriers in integrated circuits. Medical linear accelerators incorporate tungsten sheets for collimators due to superior radiation attenuation. Industrial uses include crucibles for sapphire crystal growth and electrodes for resistance welding. Recent innovations employ nanostructured tungsten sheets in next-gen fusion reactor designs.
Safety and Storage
While solid tungsten sheets pose minimal risk, grinding or machining produces inhalable dust requiring NIOSH-approved respirators. Facilities must implement local exhaust ventilation to maintain airborne concentrations below 5 mg/m³ (OSHA PEL). Store sheets in sealed containers with desiccants to prevent oxidation. Avoid contact with strong oxidizers like nitrates or chlorates. Firefighting requires Class D extinguishers for tungsten fires - water accelerates combustion at high temperatures.
B2B Procurement Guide
Specify required certifications such as ITAR compliance for defense applications or RoHS for electronics. Key purchasing parameters include thickness tolerance (±0.01mm for precision uses), surface roughness (Ra <0.8μm for thin films), and grain structure (preferred for bending applications). Leading suppliers include Plansee Group and Buffalo Tungsten in North America, while China's Xiamen Tungsten dominates the Asian market. MOQ typically starts at 5kg for custom orders, with lead times of 4-8 weeks for specialized alloys. Consider requesting material test reports (MTR) with traceable lot numbers.
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