Introduction
The electrical conductivity of 1060 pure aluminum sheet is approximately 62% IACS (International Annealed Copper Standard), making it one of the most conductive aluminum alloys available commercially. This 99.6% minimum purity aluminum alloy delivers an exceptional balance of electrical performance, thermal conductivity, and corrosion resistance, positioning it as a preferred material for electrical bus bars, transformer windings, and heat dissipation components. At Dongguan Stirling Metal Products Co., Ltd., we process 1060 aluminum sheet with precision CNC machining to achieve tight tolerances and superior surface finishes for demanding electrical and thermal applications. The alloy’s high conductivity stems from its minimal alloying element content, which reduces electron scattering within the crystal lattice, allowing efficient charge carrier movement.
Chemical Composition
| Element | Min (%) | Max (%) | Typical (%) |
|---|---|---|---|
| Aluminum (Al) | 99.60 | 99.90 | 99.70 |
| Silicon (Si) | — | 0.25 | 0.10 |
| Iron (Fe) | — | 0.35 | 0.20 |
| Copper (Cu) | — | 0.05 | 0.02 |
| Manganese (Mn) | — | 0.03 | 0.01 |
| Magnesium (Mg) | — | 0.03 | 0.01 |
| Zinc (Zn) | — | 0.05 | 0.02 |
| Titanium (Ti) | — | 0.03 | 0.01 |
| Vanadium (V) | — | 0.05 | 0.02 |
| Others (each) | — | 0.03 | 0.01 |
| Others (total) | — | 0.10 | 0.05 |
The chemical composition of 1060 aluminum is tightly controlled to maintain high purity. Silicon and iron are the primary impurities, typically present at levels below 0.25% and 0.35% respectively, as they originate from bauxite ore and smelting processes. Copper, manganese, magnesium, zinc, titanium, and vanadium are kept at trace levels to prevent formation of intermetallic compounds that would degrade electrical conductivity. Each additional element reduces conductivity by approximately 0.5% IACS per 0.1% addition, so strict adherence to composition limits is critical. Dongguan Stirling Metal Products Co., Ltd. sources only certified 1060 aluminum coils and sheets with full mill test certificates to guarantee purity compliance.
Mechanical Properties
| Property | Value | Test Standard |
|---|---|---|
| Tensile Strength (MPa) | 70–110 | ASTM B557 / ISO 6892-1 |
| Yield Strength (MPa) | 20–50 | ASTM B557 / ISO 6892-1 |
| Elongation at Break (%) | 15–30 | ASTM B557 / ISO 6892-1 |
| Hardness (HB) | 20–30 | ASTM E10 / ISO 6506-1 |
| Shear Strength (MPa) | 50–70 | ASTM B769 / ISO 8749 |
| Fatigue Strength (MPa) at 10^7 cycles | 30–45 | ASTM E466 / ISO 1099 |
| Modulus of Elasticity (GPa) | 69 | ASTM E111 / ISO 527-1 |
| Poisson’s Ratio | 0.33 | ASTM E132 / ISO 527-1 |
1060 aluminum exhibits low mechanical strength compared to heat-treatable alloys, but its ductility and formability are excellent. The tensile strength range of 70–110 MPa is sufficient for non-structural electrical components, while the high elongation (15–30%) allows bending, stamping, and deep drawing without cracking. The low hardness (20–30 HB) makes the alloy easy to machine but requires careful tool selection to avoid built-up edge formation. The modulus of elasticity (69 GPa) is typical for aluminum, providing good stiffness for sheet applications. These properties make 1060 ideal for applications where conductivity is prioritized over load-bearing capacity.
CNC Machining Parameters
| Operation | Cutting Speed (m/min) | Feed Rate (mm/rev) | Depth of Cut (mm) | Tool Material | Coolant |
|---|---|---|---|---|---|
| Rough Turning | 300–500 | 0.15–0.30 | 2.0–4.0 | Carbide (K10/K20) | Water-soluble emulsion |
| Finish Turning | 400–600 | 0.05–0.15 | 0.2–0.5 | Carbide (K10) or PCD | Water-soluble emulsion |
| Face Milling | 350–550 | 0.10–0.25 | 1.0–3.0 | Carbide (K20) | Water-soluble emulsion |
| End Milling (slotting) | 250–400 | 0.08–0.20 | 0.5–2.0 | Carbide (K10/K20) | Water-soluble emulsion |
| Drilling (Ø5–15 mm) | 100–200 | 0.05–0.15 | — | HSS-Co or Carbide | Water-soluble emulsion |
| Threading (M6–M12) | 50–80 | 0.02–0.05 | — | HSS or Carbide | Water-soluble emulsion |
CNC machining of 1060 aluminum requires attention to chip control and surface finish due to the material’s softness and tendency to form built-up edges. High cutting speeds (300–600 m/min) with sharp carbide tools produce excellent surface finishes (Ra 0.4–0.8 µm). For finishing operations, polycrystalline diamond (PCD) tools can achieve mirror-like surfaces. Coolant is essential to prevent chip welding and maintain dimensional accuracy. Dongguan Stirling Metal Products Co., Ltd. uses advanced CNC lathes and milling centers with high-pressure coolant systems to machine 1060 aluminum sheet to tolerances of ±0.05 mm for critical electrical components.
Applications
1060 aluminum sheet is widely used in electrical and thermal management applications due to its high conductivity. Specific industry uses include:
- Electrical Bus Bars: 1060’s 62% IACS conductivity makes it ideal for low-voltage switchgear, distribution panels, and power transmission bus bars where weight reduction is important.
- Transformer Windings: Foil and strip windings for distribution transformers benefit from the alloy’s high thermal conductivity (234 W/m-K) for heat dissipation.
- Heat Sinks: LED lighting, power electronics, and automotive heat exchangers use 1060 sheet for its excellent thermal transfer properties.
- Capacitor Foil: Electrolytic capacitor electrodes require high-purity aluminum foil with consistent thickness and surface quality.
- Reflectors: Lighting reflectors and solar concentrators leverage the alloy’s high reflectivity when polished.
- Chemical Equipment: Storage tanks and piping for food processing and pharmaceutical industries benefit from corrosion resistance.
The alloy’s combination of high conductivity, formability, and corrosion resistance makes it the first choice for applications where electrical performance is paramount.
Quality Control
At Dongguan Stirling Metal Products Co., Ltd., every 1060 aluminum sheet undergoes rigorous quality control to ensure compliance with ASTM B209 and EN 485 standards. Verification methods include:
- Optical Emission Spectrometry (OES): Spectrochemical analysis confirms chemical composition within specified limits, with particular attention to silicon and iron content.
- Tensile Testing: Universal testing machines measure tensile strength, yield strength, and elongation per ASTM B557, with results recorded for each production lot.
- Hardness Testing: Brinell hardness measurements (HB) using a 10 mm ball indenter at 500 kg load verify consistent material condition.
- Dimensional Inspection: Coordinate measuring machines (CMM) and micrometers check thickness, flatness, and edge quality to ±0.02 mm tolerances.
- Conductivity Measurement: Eddy current conductivity meters verify electrical conductivity at 62% IACS minimum, with full traceability.
- Surface Quality: Visual inspection under controlled lighting detects scratches, pits, and oxidation, with surface roughness measured using profilometers.
Each shipment includes a material test certificate (MTC) with full traceability from mill to finished part.
Why Choose Us
Dongguan Stirling Metal Products Co., Ltd. combines over 15 years of CNC machining expertise with a deep understanding of aluminum metallurgy. Our facility houses 50+ CNC machining centers, including 5-axis machines capable of handling 1060 aluminum sheets up to 2000 mm × 1000 mm. We maintain ISO 9001:2015 certification and employ a dedicated quality team that performs 100% inspection on critical dimensions. Our engineers work closely with clients to optimize machining parameters for maximum productivity and surface finish. We offer just-in-time delivery, competitive pricing, and full technical support from material selection to final inspection. Whether you need prototype quantities or high-volume production runs, our team delivers precision-machined 1060 aluminum components that meet the most demanding electrical and thermal performance requirements.
