Anhui Tianming Cable Co., Ltd. selects the shielding materials for computer cables primarily based on the following factors:

1. The electromagnetic shielding layer material should be a metal with good conductivity, such as copper or aluminum. Due to cost considerations, alloy materials like copper-clad aluminum can also be chosen.

2. The shielding layer should be designed with a double or multi-layer structure to enhance the shielding effect.

3. The shielding layer should be constructed with a braided structure to increase the difficulty of electromagnetic leakage, thereby reducing the likelihood of electromagnetic leakage.

4. Shielded cables should utilize a shielding layer structure with high weaving density, reliable fixation, and no shedding during weaving.

5. In the insulation and sheath layers, additives to prevent electromagnetic wave interference should be added to enhance the resistance to electromagnetic interference.

6. Shielded cables should possess excellent electrical continuity to ensure the effectiveness of electromagnetic shielding.

7. The shielding material for electrical cables should possess high-temperature resistance, oil resistance, cold resistance, tensile strength, and resistance to distortion to ensure the cable's lifespan and reliability.

In summary, the shielding material for computer cables should possess good conductivity, reasonable structure, and excellent mechanical properties to ensure electromagnetic compatibility and resistance to electromagnetic interference. The selection criteria for the shielding material of computer cables mainly include the following aspects:

1. Conductor Shielding Layer: Typically made of woven metal wire or metal foil, its primary function is to limit the leakage of electromagnetic fields inside and outside, enhancing the cable's confidentiality, and preventing signal interception.

2. Insulation Layer: Insulating materials prevent short circuits between conductors and also shield against external interference.

3. Metal Armor: Generally used for external protection, it can prevent damage to the cable from external forces and also isolate electromagnetic interference.

When making actual selections, it is recommended to choose the appropriate cable based on the electromagnetic environment, power voltage, and electrical parameters of the computer cable application. You may also refer to relevant domestic industry standards. Specifically, some common shielding materials include:

Metal woven mesh: commonly used as twisted shielded pairs, effectively preventing external electromagnetic interference.

Metal foil sheets: commonly used for single or multilayer composite shielding, effectively preventing internal signal leakage and enhancing confidentiality.

Aluminum pipes: Provide good shielding in cables but are more expensive.

Tinned copper braid mesh: It offers good shielding performance and good grounding, hence it is widely used.

In summary, the shielding material for computer cables must have excellent electromagnetic shielding properties, while also considering factors such as cost, processing technology, and operating environment. In specific applications, a comprehensive assessment and selection based on actual needs are required.