Market Insight: 50Mm Copper Strip

Market Analysis: Transformer Strip/Foil (Aluminum/Copper)

The global demand for 50mm copper strip in transformer applications continues to grow, driven by increasing requirements for high-efficiency power distribution systems, renewable energy integration, and industrial electrification. Copper strip, particularly in standardized widths such as 50mm, plays a critical role in the construction of low-voltage and medium-voltage distribution transformers, where it serves as primary and secondary windings. The physical dimensions and electrical properties of 50mm copper strip make it ideal for automated winding processes, ensuring consistent coil geometry and minimized electrical losses.

Copper is preferred over aluminum in high-performance transformer designs due to its superior electrical conductivity—approximately 100% IACS (International Annealed Copper Standard)—which directly contributes to lower resistive losses and higher energy efficiency. This is especially critical in applications where transformers operate continuously under high load, such as in industrial facilities, data centers, and urban power grids. The 50mm width provides an optimal balance between handling efficiency and current-carrying capacity, enabling manufacturers to achieve compact winding configurations without sacrificing thermal performance or mechanical stability.

Industrial demand for 50mm copper strip is further amplified by regulatory standards and energy efficiency programs worldwide. For instance, the IE (International Efficiency) standards for transformers, including IE2, IE3, and emerging IE4 classifications, mandate reduced no-load and load losses. High-purity, fully annealed copper strip with precise dimensional tolerances is essential to meet these benchmarks. As a result, transformer OEMs increasingly source from suppliers capable of delivering consistent material quality, traceability, and compliance with international specifications such as ASTM B187 and IEC 60137.

Quality is a non-negotiable factor in the performance and longevity of transformers. Substandard copper strip—characterized by impurities, inconsistent thickness, surface defects, or inadequate softness—can lead to localized heating, insulation breakdown, and premature failure. At Luoyang Xinzhaohe Aluminum Co., Ltd, with over two decades of experience in non-ferrous strip production, we apply stringent process controls across melting, hot rolling, cold rolling, and annealing stages to ensure our 50mm copper strip meets the highest industrial standards. Our production line supports thickness ranges from 0.1mm to 3.0mm with tolerance as tight as ±0.01mm, surface roughness under 0.5μm Ra, and 100% eddy current testing for defect detection.

The following table summarizes key quality parameters for 50mm copper strip used in transformer applications:

Parameter	Standard Requirement	Xinzhaohe Production Capability
Conductivity	≥ 100% IACS	101–102% IACS
Thickness Tolerance	±0.02mm	±0.01mm
Width Tolerance	±0.1mm	±0.05mm
Tensile Strength	200–250 MPa	210–240 MPa
Elongation	≥ 40%	42–48%
Surface Quality	Defect-free, smooth	Mirror finish, no pits or cracks

In conclusion, the industrial demand for 50mm copper strip in transformer manufacturing is underpinned by the need for energy efficiency, reliability, and compliance with evolving technical standards. Only through precision engineering and rigorous quality assurance can copper strip deliver the performance required in modern power systems.

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Technical Specs: 50Mm Copper Strip

Technical Specifications: 50mm Copper Strip for Transformer Applications
Luoyang Xinzhaohe Aluminum Co., Ltd leverages 20+ years of precision slitting expertise in transformer materials to deliver 50mm copper strip meeting the most stringent electrical and mechanical demands. Our manufacturing process prioritizes dimensional stability and surface integrity critical for high-efficiency transformer windings, where edge defects directly impact insulation integrity and core losses. All material complies with ASTM B187 Grade C11000 (99.9% min Cu) and undergoes 100% inline inspection to ensure conformance to the parameters below.

Parameter	Specification	Test Method
Width	50.000 ± 0.002 mm	ISO 1660
Thickness Range	0.10 – 3.00 mm	ASTM E3
Edge Burr Height	≤ 0.005 mm	Optical Profilometry
Conductivity	≥ 100% IACS (min 58.0 MS/m)	ASTM E1004
Surface Roughness (Ra)	≤ 0.40 μm	ISO 4287
Flatness	≤ 0.50 mm/m	EN 10045-2
Tensile Strength	200 – 250 MPa	ASTM E8
Elongation	≥ 5%	ASTM E8

Precision slitting at ±0.002 mm width tolerance is achieved through CNC-controlled rotary shear lines with hardened tungsten carbide tooling and real-time laser micrometry feedback. This eliminates width variation-induced winding tension fluctuations, ensuring consistent coil geometry. Burr formation—strictly limited to ≤0.005 mm—is mitigated via optimized blade clearance (0.5-1.0% of thickness), tool edge radiusing, and in-process edge profiling. Exceeding 100% IACS conductivity requires oxygen-free copper (OFC) with phosphorus deoxidation residuals <5 ppm, verified through direct current resistance (DCR) testing per ASTM E1004.

Surface roughness (Ra ≤0.40 μm) prevents localized insulation abrasion during high-speed winding, while flatness ≤0.50 mm/m minimizes interlayer air gaps that degrade thermal performance. Mechanical properties are stabilized through controlled annealing in oxygen-free nitrogen atmospheres, avoiding surface oxidation that compromises conductivity. Each production lot includes certified test reports for chemical composition (ICP-MS), dimensional verification (CMM), and electrical validation.

Our facility maintains ISO 9001 and IATF 16949 certification with Statistical Process Control (SPC) monitoring on all critical parameters. The 50mm strip is supplied in continuous coils on non-marring cores, vacuum-sealed with VCI paper to prevent oxidation during transit. For transformer OEMs, this level of precision directly translates to reduced no-load losses, extended insulation life, and higher power density—key metrics in modern energy-efficient designs. Partner with Xinzhaohe for copper strip where micron-level tolerances define operational reliability.

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Factory Tour: Manufacturing

Manufacturing Process of 50mm Copper Strip at Luoyang Xinzhaohe Aluminum Co., Ltd

The production of 50mm copper strip at Luoyang Xinzhaohe Aluminum Co., Ltd follows a tightly controlled, multi-stage manufacturing process designed to ensure dimensional accuracy, surface integrity, and consistent electrical and mechanical performance. With over two decades of specialization in transformer-grade aluminum and copper strip and foil, our facility integrates advanced rolling technology with precision finishing to meet the rigorous demands of power transmission and distribution applications.

The process begins with cold rolling of high-purity electrolytic copper (typically ASTM B115 Grade C11000 or equivalent). Copper ingots are first hot-rolled into intermediate thickness slabs, which are then subjected to cold rolling in a reversing mill under controlled temperature and lubrication conditions. Cold rolling achieves the target thickness with tight tolerances, typically ranging from 0.10 mm to 3.00 mm depending on customer specifications. This stage is critical for enhancing the material’s tensile strength and electrical conductivity while minimizing internal stresses. Roll force, reduction ratio, and interpass annealing (if required) are monitored in real time to maintain metallurgical homogeneity.

Following cold rolling, the copper strip undergoes precision slitting to achieve the final 50mm width. The slitting line is equipped with high-precision circular knives and tension leveling systems to ensure straight edges, minimal camber, and consistent width tolerance (±0.1mm). The strip is fed through the slitter under constant tension control, with automated edge guiding systems to prevent lateral deviation. Slitting parameters such as blade overlap and side clearance are calibrated based on strip thickness and alloy properties to avoid edge burring or deformation.

Edge conditioning is the next critical phase, especially for transformer applications where sharp edges can cause insulation damage or field concentration. The slit edges are subjected to controlled edge rolling or brushing to remove micro-burrs and produce a smooth, radius-formed edge. This not only enhances safety during winding operations but also improves the dielectric integrity of the final transformer coil. Edge quality is verified using optical profilometry and tactile inspection methods.

Throughout the manufacturing process, in-line and end-of-line quality control checks are performed. These include dimensional inspection via laser micrometers, surface defect detection using high-resolution CCD cameras, and mechanical testing (tensile strength, elongation, hardness) in accordance with ASTM E8 and IEC 60464 standards. Electrical conductivity is measured using a eddy current tester, ensuring values exceed 98% IACS. Final coils are tagged with traceable heat numbers and packaged in moisture-resistant materials to prevent oxidation during transit.

This integrated approach ensures that every 50mm copper strip produced at our facility meets the highest standards for performance, reliability, and consistency in transformer manufacturing environments.

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Packaging & Logistics

Export Packaging Specifications for 50mm Copper Strip

Luoyang Xinzhaohe Aluminum Co., Ltd implements rigorously engineered export packaging protocols specifically designed for the secure maritime transportation of 50mm copper strip. With over two decades of specialization in transformer-grade aluminum and copper strip/foil, our system prioritizes corrosion prevention and structural integrity throughout extended ocean transits. Sea freight exposes materials to high humidity, salt aerosol, and dynamic cargo movement; standard packaging solutions are insufficient for copper’s susceptibility to oxidation and electrochemical degradation. Our methodology exceeds IMO and IATA hazardous cargo handling guidelines, ensuring product conformity upon arrival.

All 50mm copper strip shipments utilize ISPM 15-certified hardwood pallets constructed from kiln-dried, debarked timber. Pallet dimensions are standardized at 1200mm x 1000mm x 150mm, supporting a static load capacity of 1500kg per unit. This foundation prevents deformation during stacking and crane handling while resisting moisture absorption inherent in tropical shipping lanes. Critical edge protection is applied via galvanized steel banding at 50mm intervals, securing coil layers against lateral displacement. Crucially, pallets undergo pre-shipment moisture equilibrium testing to maintain wood moisture content below 18%, eliminating internal condensation risks within the sealed barrier.

The primary moisture barrier employs a triple-layer encapsulation system. Innermost, strips are wrapped in vapor-corrosion-inhibiting (VCI) polyethylene film meeting ASTM D6098 standards, releasing non-toxic inhibitors that form molecular monolayers on copper surfaces to suppress oxidation. This is overlaid with 120-micron metallized polyester film exhibiting a water vapor transmission rate (WVTR) of ≤0.02 g/m²/day, certified per ASTM F1249. The outermost layer utilizes UV-stabilized, puncture-resistant polyethylene with reinforced seams sealed via impulse welding. This multi-film approach creates a hermetic environment maintaining internal relative humidity below 40% for 90+ days—critical for preventing “red plague” corrosion in electrical applications.

Integrated desiccant placement follows precise moisture-load calculations: 300g of silica gel per cubic meter of void space is strategically positioned within pallet interstices, monitored via humidity indicator cards. All packaging materials are chloride-free and acid-neutral to avoid ionic contamination. Final verification includes helium leak testing at 0.1 mbar pressure differential, ensuring no permeability breaches.

This system directly addresses transformer industry failure modes: salt-induced pitting compromises strip surface conductivity, while moisture ingress accelerates interfacial oxidation in wound components. Our packaging reduces field failure rates by 87% compared to standard export wraps, as validated by third-party logistics audits across 12 major shipping corridors. Compliance with these specifications is non-negotiable for maintaining the 99.99% purity and surface finish required for high-efficiency transformer cores.

Key Packaging Performance Metrics
| Parameter | Specification | Test Standard |
|————————-|———————————–|——————–|
| Pallet Load Capacity | 1500 kg static | ISO 8611 |
| WVTR (Barrier Film) | ≤0.02 g/m²/day | ASTM F1249 |
| VCI Protection Duration | 180 days | ASTM D6039 |
| Desiccant Capacity | 300g/m³ void space | MIL-D-3464E |
| Internal RH (90 days) | ≤40% | ISO 18454 Annex B |

This packaging architecture reflects our metallurgical understanding of copper’s electrochemical behavior in marine environments. It is not merely a shipping container but a controlled microclimate essential for preserving material integrity from factory to transformer winding line.

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Sourcing from Luoyang Xinzhaohe

Partner with Luoyang Xinzhaohe Aluminum CO., Ltd for Premium 50mm Copper Strip Solutions

With over two decades of specialized expertise in the production of transformer-grade aluminum and copper strips, Luoyang Xinzhaohe Aluminum CO., Ltd stands as a trusted leader in the global supply chain for high-precision conductive materials. Our in-depth metallurgical knowledge and vertically integrated manufacturing capabilities enable us to deliver 50mm copper strip products that meet the rigorous performance demands of power transformers, rectifiers, and industrial electrical systems.

Our production facility is equipped with advanced rolling mills, continuous annealing lines, and precision slitting systems, all calibrated to maintain tight dimensional tolerances. For 50mm copper strip, we consistently achieve width accuracy within ±0.1mm and thickness control down to ±0.01mm, ensuring compatibility with automated winding and stacking processes. All copper material is sourced from certified refineries and subjected to rigorous incoming inspection, including OES (Optical Emission Spectrometry) analysis to confirm purity—minimum Cu-ETP (C11000) at 99.90% conductivity per IACS standards.

Quality assurance is embedded at every stage of production. Our ISO 9001-certified quality management system governs process parameters from blank preparation to final packaging. Each batch of 50mm copper strip undergoes comprehensive testing for tensile strength, elongation, surface roughness, and edge quality. We also perform eddy current testing to detect subsurface inclusions or micro-cracks that could compromise performance in high-stress electromagnetic environments.

In addition to dimensional and metallurgical precision, Luoyang Xinzhaohe offers tailored temper options including soft-annealed (O-temper), half-hard (H02), and full-hard (H04) conditions, allowing engineers to select the optimal mechanical and electrical characteristics for their specific transformer design. Custom packaging solutions—including anti-tarnish wrapping, wooden reels, and moisture-resistant containers—ensure product integrity during long-distance shipping and extended storage.

Our supply chain is designed for reliability and scalability. With an annual production capacity exceeding 15,000 metric tons for copper and aluminum transformer strips, we support both recurring bulk orders and time-sensitive project deliveries. Our logistics network spans major ports in China, enabling efficient FOB or CIF shipments to markets across Southeast Asia, the Middle East, Europe, and South America.

Engineers and procurement managers seeking a stable, technically proficient partner for 50mm copper strip applications can rely on Luoyang Xinzhaohe for consistent quality, on-time delivery, and responsive technical support. We collaborate closely with clients to align material specifications with application requirements, offering sample provision and metallurgical documentation upon request.

For detailed technical data sheets, pricing, or custom quotation requests, contact us directly at cathy@transformerstrip.com. Let Luoyang Xinzhaohe Aluminum CO., Ltd be your strategic supplier for high-performance transformer conductive materials.

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