Brass Foil[2]
Overview
Brass foil is a versatile material composed primarily of copper (60-90%) and zinc (10-40%), with possible trace elements like lead or tin. Its golden appearance and balanced properties make it a preferred choice for both functional and aesthetic applications. The material's history dates back centuries, with modern production achieving precise thicknesses from 0.05mm to 3mm through cold rolling processes. Industrial grades like C26000 (70/30 brass) dominate the market due to their optimal combination of formability and strength. The foil is supplied in rolls or sheets, with surface finishes ranging from mill finish to polished or coated varieties for specialized applications.
Physical and Chemical Properties
Brass foil exhibits superior electrical conductivity (about 28% IACS for C26000), though slightly lower than pure copper. Its thermal conductivity reaches approximately 120 W/m·K, making it useful for heat exchangers. The material's corrosion resistance stems from a protective oxide layer that forms naturally, though dezincification can occur in harsh environments. Mechanical properties vary significantly with alloy composition. Typical tensile strength ranges from 300-500 MPa, with elongation at break between 15-65%. The foil can withstand repeated bending without fracturing, a critical property for electrical connectors. Unlike pure copper, brass demonstrates better resistance to stress corrosion cracking.
Main Applications
In electrical engineering, brass foil serves as shielding material for cables and flexible connectors in circuit breakers. Its non-sparking property makes it ideal for explosive environment applications. The automotive industry uses it for radiator components and lock washers. Decorative applications include architectural accents, musical instrument parts, and jewelry findings. Artisans value its patina development over time. Industrially, it's processed into gaskets, washers, and precision springs where corrosion resistance and conductivity are paramount. Emerging uses include RFID antennas and flexible printed circuits.
Safety and Storage
Brass foil presents minimal health risks under normal handling conditions. Machining operations may generate respirable dust containing copper and zinc oxides, requiring local exhaust ventilation. Prolonged skin contact may cause mild irritation in sensitive individuals. Storage should prevent contact with ammonia compounds or strong acids to avoid stress corrosion cracking. Stack sheets with protective interleaving to prevent surface scratches. For long-term storage, consider vapor corrosion inhibitors (VCI) packaging in humid climates. Inventory should follow FIFO (first-in, first-out) principles to prevent excessive aging of stocked material.
B2B Procurement Guide
Key specifications to confirm include: alloy grade (e.g., C26000), thickness tolerance (±0.01mm for precision applications), width/coil parameters, and surface condition (annealed, quarter-hard, etc.). Lead-free grades are essential for food contact or children's products. Quality verification should include certificate of analysis for composition, mechanical test reports, and surface inspection under ASTM B248 standards. For large orders, request mill test reports (MTRs). Consider suppliers with ISO 9001 certification and ask about their annealing capabilities, as this affects formability. Just-in-time delivery options help minimize inventory costs for high-volume users.
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