Overview
Polished copper granules are small, high-purity copper particles with a smooth surface finish, produced through processes like electrolysis or mechanical polishing. These granules are prized for their excellent electrical and thermal conductivity, making them indispensable in industries such as electronics, metallurgy, and chemical processing. Copper granules are available in various sizes and purity levels, typically ranging from 99.9% to 99.99% pure. Their polished surface reduces oxidation and enhances performance in applications like brazing and alloy production. The granules are also used as conductive fillers in composites and coatings.
Physical and Chemical Properties
Polished copper granules exhibit a distinctive metallic luster and high density due to their pure copper composition. They are insoluble in water and most organic solvents but can react with acids and oxidizing agents. Their high melting and boiling points make them suitable for high-temperature applications. The granules' excellent electrical conductivity (about 58 MS/m) and thermal conductivity (401 W/m·K) are key attributes for their use in electronics and heat exchangers. Their corrosion resistance, especially in non-oxidizing environments, further enhances their durability in industrial settings.
Main Applications
Polished copper granules are widely used in brazing and soldering due to their ability to form strong, conductive joints. They are also a critical component in producing copper-based alloys, such as bronze and brass, where their high purity ensures consistent quality. In the electronics industry, these granules serve as conductive fillers in printed circuit boards and electromagnetic shielding materials. Additionally, they are used in chemical catalysts and as additives in lubricants to improve thermal conductivity and reduce friction.
Safety and Storage
While polished copper granules are generally safe to handle, precautions should be taken to avoid inhalation of dust, which can irritate the respiratory system. Protective gloves and goggles are recommended during handling to prevent skin and eye contact. Storage should be in a cool, dry environment, away from oxidizing agents and acids to prevent corrosion. Properly sealed containers are ideal to minimize exposure to moisture and air, which can lead to surface oxidation over time.
B2B Procurement Guide
When procuring polished copper granules, prioritize suppliers with certifications for purity and consistency. Key specifications to verify include particle size distribution, purity level (typically 99.9% or higher), and surface finish. Bulk purchases often come with cost advantages, but ensure the supplier can meet your volume requirements without compromising quality. Consider logistics and storage capabilities, as copper granules are dense and require adequate space. Request samples for testing before large-scale orders to confirm performance in your specific application.
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