Overview
Copper granules are finely divided copper particles, typically ranging from 0.5mm to 5mm in diameter. They retain the intrinsic properties of bulk copper, including exceptional electrical conductivity (second only to silver) and thermal conductivity. These granules are produced through atomization, electrolysis, or mechanical milling processes, with purity levels commonly exceeding 99.9% for industrial applications. In B2B transactions, copper granules are traded as raw materials for downstream manufacturing. Their particulate form allows for precise dosing in alloys and easier melting compared to solid blocks. The global market for copper granules is closely tied to the electronics and construction industries, with Asia being the dominant production and consumption region.
Physical and Chemical Properties
Copper granules exhibit the characteristic reddish-brown luster of pure copper, though surface oxidation may darken exposed particles. Their density (8.96 g/cm³) makes them significantly heavier than most metal powders. The granules are malleable and can be compressed without fracturing, a feature utilized in powder metallurgy applications. Chemically, copper granules are stable in dry air but gradually form a green patina (verdigris) in humid conditions. They resist corrosion from neutral and alkaline solutions but react readily with oxidizing acids. When heated above 300°C, surface oxidation accelerates, requiring inert atmospheres for high-temperature processing. The granules' high surface area-to-volume ratio enhances their reactivity in catalytic applications compared to solid copper forms.
Main Applications
The primary use of copper granules is in metallurgical processes, where they serve as charge materials for brass/bronze production and copper alloy melting. Their uniform size ensures consistent composition in castings. In electronics, high-purity granules are melted for PCB trace production and electromagnetic wire manufacturing. Chemical industries employ copper granules as catalysts in reactions like the Rochow process for organosilanes. Their particulate form allows efficient gas-solid contact in fixed-bed reactors. Smaller granules (under 1mm) are preferred for brazing pastes and metal injection molding (MIM) feedstocks. Emerging applications include conductive fillers in 3D printing materials and antifouling additives in marine paints.
Safety and Storage
While copper granules are generally stable, their dust poses inhalation hazards (TLV 1 mg/m³ for copper dust). Facilities should implement local exhaust ventilation during bulk handling and require workers to wear NIOSH-approved particulate respirators. Spilled granules create slip hazards and should be promptly collected using non-sparking tools. Storage recommendations include moisture-proof packaging (often vacuum-sealed bags inside steel drums) and separation from strong oxidizers like ammonium nitrate. Copper's high value makes secure storage essential to prevent theft. For long-term storage, nitrogen-purged containers prevent oxide formation. Bulk shipments typically use super sacks with plastic liners to minimize oxidation during transit.
B2B Procurement Guide
Industrial buyers should specify purity (e.g., Cu-CATH-1 grade for 99.99% purity), particle size distribution (sieve analysis reports), and acceptable oxide content (typically under 0.5%). Mill certificates should accompany shipments, verifying composition and production method. Electrolytic granules command premium prices but offer superior conductivity. Reliable suppliers provide material safety data sheets (MSDS) and may offer customized granule sizes. For large orders (5+ metric tons), negotiate based on LME copper prices plus processing fees. Consider logistics costs—copper's density makes freight expensive per volume. Just-in-time procurement is advisable to avoid capital tied up in inventory, as copper prices fluctuate with commodities markets.
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