Overview
T2 Grade is a designation for high-purity copper (≥99.9% Cu) with minimal impurities, making it ideal for applications requiring superior conductivity and durability. It is standardized under ASTM B152 as C11000 and is widely recognized in global industrial markets. This material is favored for its balance of mechanical properties and cost-effectiveness. Unlike oxygen-free copper, T2 retains trace oxygen (≤0.04%) but maintains excellent performance in most electrical and thermal applications.
Physical and Chemical Properties
T2 Grade copper exhibits a face-centered cubic crystal structure, contributing to its high ductility and malleability. Its electrical conductivity reaches 100% IACS (International Annealed Copper Standard), with a thermal conductivity of 401 W/m·K at 20°C. The material resists corrosion in non-oxidizing environments but may tarnish when exposed to sulfur compounds. Its tensile strength ranges from 200-250 MPa, extendable to 300 MPa through cold working. Annealing at 400-700°C restores softness for further fabrication.
Main Applications
Primary uses include electrical components like busbars, windings, and power cables, where energy efficiency is critical. The construction sector utilizes T2 copper for plumbing systems due to its antimicrobial properties and longevity. Industrial applications span heat exchangers, transformers, and motor parts. In electronics, it serves as a base material for printed circuit boards (PCBs) and semiconductor lead frames. Emerging uses include renewable energy systems like solar thermal collectors.
Safety and Storage
Solid T2 copper poses minimal health risks, but dust inhalation during machining requires NIOSH-approved respirators. Proper ventilation is necessary when welding or soldering to prevent metal fume fever. Store copper coils or sheets in moisture-controlled environments to prevent surface oxidation. Palletized materials should be covered with anti-tarnish paper. Bulk procurement may require climate-controlled warehousing for long-term storage.
B2B Procurement Guide
Specify ASTM B152 or equivalent international standards (e.g., EN 13601) when ordering. Key verification points include mill test reports for purity and dimensional tolerances. For large-volume purchases, consider futures contracts to hedge against copper price volatility. Reputable suppliers typically offer certifications from the Copper Development Association (CDA) or London Metal Exchange (LME) registration. Just-in-time delivery options help minimize inventory costs.
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