Induction Melting Equipment

2026-04-29

The Physical Properties of Solid Aluminum: A Technical Guide Aluminum is a light metal defined by its low density and high versatility. The density of solid pure aluminum is approximately 2.7 g/cm³, roughly one-third that of iron or copper. While density varies slightly with purity, the most significant industrial advantages of aluminum lie in its electrical and thermal performance. 1. Electrical Conductivity and Resistivity Pure aluminum is an exceptional conductor of electricity. For high-purity aluminum (99.990%), the physical specifications at 20°C are as follows: Resistivity ($\rho$): $2.6548 \times 10^{-8} \, \Omega \cdot \text{m}$ Volume Conductivity: 64.94% IACS (International Annealed Copper Standard). Electrical Grade Aluminum: Typically maintains a volume conductivity of at least 62% IACS. Sensitivity to Purity and Temperature Aluminum’s electrical performance is highly sensitive to its environment and composition: Temperature: As temperature rises, resistivity increases and conductivity decreases. Purity: Conductivity drops sharply as impurities increase. In the melting and casting process for electrical-grade aluminum, maintaining high purity is critical to meeting performance standards. 2. Aluminum vs. Copper: The Efficiency Comparison While aluminum’s conductivity is only about 65% of copper’s, its significantly lower density makes it the superior choice for power transmission in terms of weight-to-performance. Property Pure Aluminum Pure...