Rare earth aluminum alloy cables feature excellent mechanical and electrical properties, and are widely applicable across all sectors of the national economy, including power supply systems, municipal engineering, general real estate buildings, high-rise buildings, power stations, commercial plazas and more.
Below is a detailed breakdown of the 13 core advantages of rare earth aluminum alloy cables:
1. Superior Creep Resistance
The alloy composition and specialized annealing process of rare earth aluminum alloy conductors greatly reduce the creep tendency of conductors under heat and pressure. Their creep resistance is 300% higher than that of pure aluminum, effectively eliminating loosening risks caused by cold flow or creep deformation.
2. High Tensile Strength & Elongation Rate
Compared with pure aluminum conductors, rare earth aluminum alloy conductors are formulated with special additives and processed via proprietary techniques, delivering drastically enhanced tensile strength. Their elongation rate reaches 30%; flexibility is 33% higher than copper, and springback is reduced by 40%, enabling safer and more reliable operation.
3. Thermal Expansion Coefficient
The thermal expansion coefficient reflects dimensional changes of materials under temperature fluctuations. Aluminum alloy has a thermal expansion coefficient comparable to copper. Aluminum connectors have been reliably matched with copper and aluminum conductors for decades, and most mainstream electrical connectors today are aluminum-made, which pairs perfectly with aluminum alloy conductors. Therefore, rare earth aluminum alloy conductors and matching connectors expand and contract in complete synchronization.
4. Reliable Connection Performance
Electrical connections made from rare earth aluminum alloy achieve the same level of safety and stability as copper connections. The tailored chemical composition of rare earth aluminum alloy significantly optimizes its connection performance. During conductor annealing, added iron elements deliver robust anti-creep performance, maintaining stable connections even under long-term overload and overheating conditions.
5. Strong Self-Weight Bearing Capacity
Rare earth aluminum alloy improves the tensile strength of pure aluminum. A rare earth aluminum alloy cable can support its own weight over a length of 4,000 meters, while copper cables only withstand 2,750 meters. This merit stands out prominently for wiring in large-span buildings such as stadiums.
6. Outstanding Corrosion Resistance
Aluminum inherently resists corrosion by forming a thin, dense oxidation film on its surface upon exposure to air, which withstands multiple forms of corrosion. The rare earth elements added into the alloy further boost anti-corrosion performance, especially against electrochemical corrosion. Thanks to this trait, aluminum is widely used as conductors for tray cables, various industrial components and storage vessels. Corrosion typically occurs where dissimilar metals connect in humid environments, which can be prevented via protective measures including lubricants, antioxidants and protective coatings. Alkaline soil and certain acidic soil types are highly corrosive to aluminum, so directly buried aluminum conductors must be protected with insulation or extruded jackets. In sulfur-containing environments such as railway tunnels, rare earth aluminum alloy far outperforms copper in corrosion resistance.
7. Excellent Flexibility
Thanks to its unique alloy formula and processing technology, rare earth aluminum alloy boasts outstanding bending performance with drastically improved flexibility. It is 30% more flexible than copper and has 40% lower springback. The minimum bending radius of ordinary copper cables is 15–20 times the outer diameter, while rare earth aluminum alloy cables only require 7 times the outer diameter, making terminal connection much easier.
8. Optimized Armoring Performance
Most conventionally armored cables in China adopt steel tape armoring, which has low safety ratings. Steel tape armoring offers weak resistance to external mechanical damage, easily leads to insulation breakdown, features heavy weight, high installation costs, poor corrosion resistance and a short service life. Our interlocked metal armored cables are developed in accordance with US standards and adopt rare earth aluminum alloy tape interlocked armor. The interlocking layered structure enables the cable to withstand severe external impact and compression without easy breakdown, lifting overall safety. Meanwhile, the armor layer isolates the cable from the outside environment; in fire scenarios, it upgrades the cable’s flame retardant and fire-resistant grade and lowers fire hazards. Compared with steel tape armor, rare earth aluminum alloy tape armor is lightweight, easy to lay, and can be installed without cable trays, cutting installation costs by 20%–40%. Different outer sheath options are available for various application scenarios to expand the cable’s scope of use.
9. Advanced Compacting Performance
In terms of volume conductivity alone, aluminum alloy is inferior to copper. However, our conductors feature upgrades in both material properties and manufacturing processes. Conventional super-compacting technology achieves a compacting factor above 0.90, while our company holds a new utility patent for a special-shaped rare earth aluminum alloy cable conductor, reaching a compacting factor over 0.96 — a pioneering technology domestically. Extreme compacting offsets the disadvantage of aluminum alloy’s lower volume conductivity. Stranded wire cores perform like solid conductors, markedly reducing core outer diameter and boosting electrical conductivity. Under the same current-carrying capacity, the outer diameter of our alloy cable is merely 10–15% larger than copper cable.
10. Lower Direct Procurement Cost
To match the electrical performance of copper cables, rare earth aluminum alloy cables adopt one size larger specification for cross-sections below 70 mm², and two sizes larger for cross-sections of 70 mm² and above. Even so, their price is 30% lower than copper cables.
11. Superior Safety & Reliability
Our cable products have obtained multiple authoritative certifications and test reports:
- ISO 9001:2008 quality management system certification
- National electrical energy product certification
- Tests by the National Center for Quality Supervision and Inspection of Fire-resistant Building Materials
- Tests by the Machinery Industry Electrical Materials & Special Cables Quality Supervision and Inspection Center
- Tests by the National Wire & Cable Quality Supervision and Inspection Center
- Tests by the Electric Power Industry Electrical Equipment Quality Inspection & Test Center
12. Lower Initial Investment & Longer Service Life
Copper cables have a designed service life of 30 years, while rare earth aluminum alloy cables serve over 40 years — more than a decade longer. Projects require less upfront investment; the alloy cables meet the economic current cross-section standard while delivering equivalent electrical performance, maximizing overall economic benefits.
The price of rare earth aluminum alloy cables is only around 70% of copper cables. Meanwhile, they deliver higher current-carrying capacity, lower DC resistance and higher specific heat capacity, resulting in reduced power loss and less heat generation. In addition, the cable outer sheath adopts low-smoke zero-halogen materials, with a maximum operating temperature of 105°C and minimum cold resistance of -40°C.