China Zhenglan Cable Technology Co., Ltd Company News

3. Performance Characteristics (I) Electrical Conductivity: Oxygen-free copper has the best electrical conductivity, followed by low-oxygen copper, and electrolytic copper is slightly inferior. This is because the presence of oxygen and other impurities increases electron scattering, leading to increased resistance.(II) Mechanical Properties: Oxygen-free copper has good ductility and toughness, and a soft texture. The mechanical properties of low-oxygen copper are similar to those of oxygen-free copper, but slightly inferior. The mechanical properties of electrolytic copper vary depending on the type and content of impurities. Generally speaking, higher impurity content may increase its strength, but reduce its toughness and ductility.(III) Corrosion Resistance: Oxygen-free copper and low-oxygen copper have better corrosion resistance because their low oxygen content makes oxidation less likely. However, the presence of certain impurities in electrolytic copper may affect its corrosion resistance under certain conditions. 4. Application Areas: Oxygen-free copper: Commonly used in applications requiring extremely high conductivity and purity, such as high-end electronics, aerospace, and precision instruments. It is also used in the manufacture of specialized wires and cables, such as audio cables and radio frequency cables.Low-oxygen copper: Widely used in the wire and cable industry, it is a common material for manufacturing conventional power cables and communication cables. It is also used in some electrical equipment with certain requirements for conductivity and mechanical properties. Electrolytic copper: One of the most common copper materials, it is widely used in the construction, power, electronics, and machinery manufacturing industries, such as in the manufacture of wires, cables, busbars, and transformer windings. It can also be used as a raw material for other copper alloys.

The Difference Between Oxygen-Free Copper, Low-Oxygen Copper, and Electrolytic Copper: 1. Purity: Oxygen-free copper: Extremely pure, typically with an oxygen content below 20 ppm, minimal impurities, and a copper content exceeding 99.99%. Low-Oxygen Copper: Oxygen content is generally around 200-400 ppm, slightly lower in purity than oxygen-free copper. Electrolytic Copper: Higher in purity, reaching 99.95%-99.98%, but still contains a certain amount of oxygen and other impurities such as lead, bismuth, and antimony. 2. Production Process: Oxygen-free copper: Typically produced using the top-draw or continuous casting and rolling methods, strictly controlling oxygen content during production and utilizing specialized smelting equipment and processes to ensure copper purity and performance. Low-Oxygen Copper: Typically produced using the continuous casting and rolling process, with relatively loose control over oxygen content during production. Targeted performance requirements are achieved through controlled oxygen content during the smelting process and the use of additives. Electrolytic copper: Produced through electrolytic refining, using crude copper as the anode and pure copper as the cathode, electrolysis occurs in a copper sulfate electrolyte. Impurities in the crude copper are removed during the electrolysis process, resulting in high-purity electrolytic copper.

Dear Customer Thanks for visiting our website. Here comes China's National Day and Mid Autumn Festival holiday. We will be on a 8-day holiday from October 1st(Wednesday) to October 8th(Wednesday). During holiday, we may have limit access to email. Shall any delay to reply your email, kindly ask for your understanding. Zhenglan Cable Technology Co., Ltd 2025. 09.30

We are going to attend the FIEE exhibision (International Trade Show of the Electrical, Electronic, Power, Automation and Connectivity Industry) to be held on September 9th~12th at São Paulo Expo Exhibition & Convention Center, and our booth number is H4. A39.   If you are going there, welcome your coming to our booth. Look forward to meeting you.   Zhenglan Cable Technology Co., Ltd  

The International Electrotechnical Commission (IEC), the world's most authoritative electrical standards organization, specifies that safety grounding conductors must use alternating green and yellow conductors. This special color scheme requires alternating stripes of the two colors every 25 mm, creating a unique visual identifier. The choice of the yellow-green combination was based on rigorous human factors research. The two colors provide a sharp contrast in most lighting conditions, making them easily identifiable even for those with color blindness and difficult to confuse with other functional conductors.   In electrical equipment, the grounding conductor fulfills the crucial function of conducting fault current to the earth. When insulation failure causes the equipment casing to become live, a good grounding system can trigger protective devices to disconnect power within milliseconds, preventing electric shock accidents. Standardized colors enable operators to instantly identify grounding conductors, significantly reducing the risk of misoperation during emergency repairs or routine maintenance. Studies have shown that standardized color coding can increase electrical maintenance efficiency by 40% and reduce accident rates by over 60%.   While the IEC standard has been adopted by most countries, the United States maintains its unique grounding conductor specifications. According to the US National Electrical Code (NEC), grounding wires can be either bare copper wire or solid green insulated conductors. This difference stems from the history of electrical engineering. Early US electrical systems used green as a grounding color, a color that remains in place today to maintain system continuity. In contrast, the UK and EU countries strictly enforce the yellow-green stripe standard, with regulations such as BS 7671 clearly stipulating legal liability for non-compliance.   Special circumstances often require workarounds. High-voltage substations may use orange grounding wires, while offshore platforms may use blue. These exceptions require special approval from regulators, prominent warning signs on the equipment, and specialized training for personnel.

  Cable shielding density is a quantitative indicator of the shielding ability of a cable shield against electromagnetic signals. It is usually expressed as a percentage, reflecting the degree to which the shield can block or attenuate electromagnetic interference. For example, in the case of a braided shield, the shielding density depends on factors such as the thickness of the braided wires and the tightness of the weave. A higher braid density means smaller gaps between the braided wires, and thus a stronger ability to block electromagnetic interference. For example, a shielding density of 90% means that the cable shield can theoretically block 90% of external electromagnetic interference signals, allowing only 10% of interference signals to pass through the shield and affect signal transmission within the cable.   Common cable shielding densities vary. The following are some of the more common ones: • 70%: Provides a certain degree of protection against external electromagnetic interference and is suitable for general electrical equipment connections with relatively low electromagnetic shielding requirements. • 80%: Provides good electromagnetic interference suppression and is commonly used for internal wiring of general electronic equipment and office equipment. • 90%: Provides excellent shielding effectiveness and is suitable for applications with certain electromagnetic environment requirements, such as industrial automation control systems. • 95%: Offers high shielding performance and is commonly used in cables sensitive to electromagnetic interference, such as communications and data transmission. • 98%: High shielding density, suitable for specialized applications with stringent electromagnetic shielding requirements, such as medical equipment and aerospace. • 99% and above: Provides extremely excellent shielding effectiveness and is generally used in military, high-end scientific research, and other applications with extremely high electromagnetic compatibility requirements.   The selection of cable shield braid density requires comprehensive consideration of multiple factors, including the application scenario, equipment requirements, and cost.   Chinese standards have different requirements for cable shielding density: • For single-core shielded cables with a nominal cross-section of 0.12 mm² or less, the shield braid density should be no less than 60%. • For other shielded cables, the shielding density should be no less than 80%. • For computer cables: The individual shielding density must reach 85%, and the total shielding density must reach 95%. • For control cables: When using round copper wire braided shielding, the braid density should be no less than 80%.