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Pure Copper Flat Bar Material Characteristics and Technical Parameters
Pure Copper Flat Bar is an indispensable high-conductivity material in power systems and lightning protection grounding projects. As a leading manufacturer in the industry, Shaoxing Sweld Electric Co., Ltd. consistently insists on using high-purity cathode copper as raw material to ensure that every Pure Copper Flat Bar meets electrical grade standards.
Core Material Standards
High-quality Pure Copper Flat Bar is mainly divided into two categories: Oxygen-Free (OF) copper and Electrolytic Tough Pitch (ETP) copper. Shaoxing Sweld Electric Co., Ltd. strictly controls the impurity content in materials through a production process certified by the ISO9001 quality management system.
- High Purity: Copper content greater than or equal to 99.90%, guaranteeing extremely low resistivity.
- Superior Conductivity: Conductivity is usually greater than or equal to 100% IACS (International Annealed Copper Standard), effectively reducing energy loss.
- Excellent Corrosion Resistance: In underground burial or humid power distribution environments, Pure Copper Flat Bar maintains physical structural stability for long periods.
- Processing Performance: Good ductility facilitates cutting, bending, and welding, allowing it to adapt to various complex installation spaces.
Key Technical Parameter Comparison
To help you better choose the Pure Copper Flat Bar suitable for your project, the following table lists reference data for common specifications and physical properties:
| Parameter Item | Soft (O) | Half-Hard (1/2H) | Hard (H) |
| Tensile Strength (MPa) | Greater than or equal to 200 | 245 to 345 | Greater than or equal to 350 |
| Elongation (%) | Greater than or equal to 30 | Greater than or equal to 15 | Greater than or equal to 5 |
| Vickers Hardness (HV) | Less than or equal to 50 | 75 to 120 | Greater than or equal to 110 |
| Conductivity (% IACS) | Greater than or equal to 100% | Greater than or equal to 97% | Greater than or equal to 96% |
| Primary Applications | Complex bending parts | Busbars, main cabinet lines | Structural support, conductive rods |
Manufacturing Advantages
Shaoxing Sweld Electric Co., Ltd. is located in Shengzhou, Shaoxing, covering an area of 3000 square meters. We do not only focus on the supply of finished Pure Copper Flat Bar but also leverage 7 high-speed CNC machining centers to provide precise hole punching, cutting, and shaping based on customer requirements. Currently, the company has a professional technical team and sales elite totaling more than 50 people to provide comprehensive technical support.
Since Shaoxing Sweld Electric Co., Ltd. also produces an annual capacity of 500 tons of exothermic welding powder, our Pure Copper Flat Bar is designed with compatibility for exothermic welding processes in mind. In lightning protection projects, using our Pure Copper Flat Bar with our self-produced molds and powder enables molecular-level permanent connections, ensuring near-zero resistance at connection points.
Common Specifications and Surface Treatments of Pure Copper Flat Bar
In electrical engineering and industrial manufacturing, the variety of Pure Copper Flat Bar specifications directly determines current-carrying capacity and installation convenience. Shaoxing Sweld Electric Co., Ltd. provides high-precision products complying with international standards such as ASTM, DIN, and EN.
Dimensions and Range
Shaoxing Sweld Electric Co., Ltd. produces Pure Copper Flat Bar covering a full range of sizes from small precision electronic components to large power distribution systems:
- Thickness Range: 3mm to 20mm.
- Width Range: 10mm to 200mm.
- Common Lengths: 3 meters, 6 meters, or precision-cut according to customer requirements.
- Tolerance Control: Through advanced processing equipment, we control thickness tolerance within 0.05mm, ensuring seamless docking in high-voltage switchgear installations.
Surface Treatment Process Comparison
Depending on the environment, Pure Copper Flat Bar requires different surface treatments. The following table outlines the mainstream solutions provided by Shaoxing Sweld Electric Co., Ltd.:
| Surface Type | Process Characteristics | Corrosion Resistance | Main Application Scenarios |
| Bare Copper | Maintains natural reddish color, direct conductivity | Standard | Indoor dry cabinets, short-circuit bars |
| Tin-plated | Silver-white surface, prevents verdigris | Excellent | Humid environments, marine engineering |
| Nickel-plated | High hardness, high-temperature oxidation resistance | Strong | High-temp environments, frequent plug-ins |
| Anti-oxidation Coating | Maintains original color with ultra-thin film | Medium | Aesthetic-focused equipment with basic protection |
Edge Processing and Custom Fabrication
Shaoxing Sweld Electric Co., Ltd. utilizes 7 high-speed CNC machining centers to provide deep customization for Pure Copper Flat Bar:
Edge Trimming: Available in Square Edge, Radius Edge, and Full Radius Edge. Rounded edges significantly reduce point discharge in high-voltage environments.
Precision Punching: Using CNC technology, we pre-drill connection holes in the Pure Copper Flat Bar according to your drawings, with a daily capacity of 180 sets of related mold parts or connection samples.
Bending and Shaping: Thanks to our technical team's calculations, our Pure Copper Flat Bar features excellent ductility, preventing stress cracks during 90-degree or 180-degree bends.
Core Application Fields of Pure Copper Flat Bar
Pure Copper Flat Bar is the cornerstone of modern industrial infrastructure due to its high efficiency and stability. Shaoxing Sweld Electric Co., Ltd. ensures every product meets the rigorous demands of various industries.
Primary Application Scenarios
The Pure Copper Flat Bar produced by Shaoxing Sweld Electric Co., Ltd. is widely used in:
- Power Distribution and Busbar Systems: Used as main busbars in substations and industrial plants to reduce temperature rise during full-load operation.
- Lightning Protection and Grounding: Serving as the core material for lightning belts and grounding grids. Coupled with our daily production of 180 sets of exothermic welding molds, it builds permanent underground grounding networks.
- New Energy and Electric Vehicles (EV): High-precision Pure Copper Flat Bar handles high-current transmission inside battery packs and charging piles.
- Heavy Machinery and Electroplating: Utilized for its chemical stability as conductive rods in electroplating tanks or induction furnace coils.
Application Performance: Grounding Material Selection
Engineers often choose between Pure Copper Flat Bar and other materials. The following table shows performance comparisons measured in the Shaoxing Sweld Electric Co., Ltd. laboratory:
| Performance Indicator | Pure Copper Flat Bar | Copper Bonded Steel | Galvanized Steel |
| Conductivity (% IACS) | 100% to 101% | 20% to 40% | 8% to 12% |
| Thermal Stability | 210 | 145 | 70 |
| Service Life (Underground) | More than 50 Years | 30 to 40 Years | 10 to 15 Years |
| Corrosion Resistance | Extremely High | High | Medium |
| Construction Ease | Extremely High | Moderate | Poor |
How to Evaluate the Quality of Pure Copper Flat Bar
The quality of Pure Copper Flat Bar is directly related to the safety of the power system. Shaoxing Sweld Electric Co., Ltd. treats quality as the lifeblood of the enterprise through ISO9001 certified standards.
Core Quality Indicators
1. Temper and Mechanical Properties: The hardness of Pure Copper Flat Bar determines its bending radius and support strength.
- O (Soft): Tensile strength approx 200-250 MPa, Elongation greater than or equal to 35%.
- H02 (Half-Hard): Tensile strength approx 245-345 MPa, Elongation greater than or equal to 15%.
2. Electrical Conductivity: High-quality bars must have extremely low resistivity. Shaoxing Sweld Electric Co., Ltd. standards ensure conductivity greater than or equal to 100% IACS, with volume resistivity at 20 degrees Celsius not higher than 0.01724 ohm mm2/m.
3. Appearance and Tolerance: Using CNC centers, we ensure:
- No cracks, inclusions, or serious oxidation spots.
- Thickness tolerance within 0.05mm and width tolerance within 0.1mm.
Shaoxing Sweld Electric Co., Ltd. has a professional team of over 50 people providing real-time technical support. Our Pure Copper Flat Bar passes national laboratory testing and ensures copper content is no less than 99.9%.
Frequently Asked Questions (FAQ)
Q1: Why choose Pure Copper Flat Bar over round conductors in grounding projects?
A: Pure Copper Flat Bar provides a larger surface area. Due to the skin effect, a flat structure offers lower impedance for discharging high-frequency lightning currents. Furthermore, Shaoxing Sweld Electric Co., Ltd. bars offer more uniform stress underground.
Q2: How is the rated current-carrying capacity determined?
A: It depends on cross-section and heat dissipation. Shaoxing Sweld Electric Co., Ltd. provides these references at 40 degrees Celsius ambient and 30 degrees Celsius rise:
- 25 x 3 mm: Approx 280A (0.67 kg/m)
- 50 x 5 mm: Approx 750A (2.22 kg/m)
- 100 x 10 mm: Approx 2200A (8.89 kg/m)
Q3: Does Shaoxing Sweld Electric Co., Ltd. support export certifications?
A: Yes. We are ISO9001, ISO14001, and ISO45001 certified. We also provide special dangerous package certificates for exothermic welding powder exports and export licenses for molds to ensure the Pure Copper Flat Bar and its accessories reach global sites smoothly.
Q4: What is recommended for high-corrosion areas?
A: We recommend the Tin-plated process by Shaoxing Sweld Electric Co., Ltd. with a coating of 10-20 micrometers. This ensures the Pure Copper Flat Bar maintains low surface resistance in salt-mist environments.
Q5: How is production capacity guaranteed for large orders?
A: With a 3000 square meter workshop and a team of over 50 professionals, Shaoxing Sweld Electric Co., Ltd. maintains a 500-ton annual powder capacity and a daily mold capacity of 180 sets. This ensures steady delivery for both standard and customized Pure Copper Flat Bar orders.
