The quality and service life of the terminal harness is closely related to the harness material.

The terminal harness is the wiring component connecting the electrical equipment in the circuit, which is composed of insulation sheath, wiring terminal, wire and insulation wrapping material. The quality and service life of the terminal harness are closely related to the selection of the harness material. Therefore, when selecting the harness material, we must be careful to ensure the quality from the source. The main factors affecting the quality of wiring harness usually include wire, terminal, plastic shell and production process. 1. The selection of wires shall be based on the different use environments. For example, the ambient temperature around the automobile engine is high, and there are many corrosive gases and liquids. Therefore, the wires with high temperature resistance, oil resistance, vibration resistance and friction resistance must be used. The wires on the automatic transmission must be resistant to high temperature and hydraulic oil, and have good temperature stability; Weak signal sensors shall use shielded wires, such as crankshaft position sensor, knock sensor, ABS wheel speed sensor, etc.; the inner wire of the door shall use wires with high bending resistance, etc. 2. Selection of plastic shell The commonly used materials of plastic parts are mainly PA6, PA66, ABS, PBT, pp, etc. When designing the plug-in, different materials can be selected according to different needs. Flame retardant or reinforced materials can also be added to the plastic according to the actual situation to achieve the purpose of reinforcement or flame retardant, such as adding glass fiber reinforcement. 3. Selection of terminal materials The terminal materials are mainly brass and bronze (the hardness of brass is slightly lower than that of bronze), of which brass accounts for a larger proportion. In addition, different plating layers can be selected according to different requirements, such as tin plating, gold plating and the like. IV. Selection of other auxiliary materials The auxiliary materials are wear-resistant, flame retardant, anti-corrosion, anti-interference, noise reduction and beautification. Generally, the auxiliary materials are selected according to the working environment and space size. Accessories usually have the following: 1, adhesive tape-wiring harness with adhesive tape are PVC tape, acetate tape, insulating tape, conductive tape, copper foil and so on. The adhesive tape plays the role of bundling, insulation, conduction and marking in the harness. Different adhesive label materials can be selected according to different requirements. 2、 sleeving-sleeving includes PVC tube, glass fiber tube, silicone tube, heat-shrinkable tube, spiral tube, etc., which has the functions of flame retardant, insulation and protection. The PVC pipe has good flexibility and bending deformation resistance. 3、 tin material-tin material is also used in a large amount in the wiring harness, such as lead-free tin bar, silver-containing tin bar, tin wire, etc., which is mainly used for immersion tin and welding at the end of the wire. It can be selected according to different purposes. 4、 hardware heads are mainly used for injection molding. Hardware heads include DC head, BNC head, stereo head, DB head, USB head, Din head and RCA head. Hardware heads also need to select models, specifications, materials and coatings according to different use environments. 5、 sizing materials-sizing materials are also used for injection molded parts. The commonly used sizing materials are 45p, 60p, etc., which are different in hardness, and can be selected according to the needs. The different choices of colors should also be distinguished. 6、 packaging materials-there are other packaging materials, such as cable ties, end belts, PE bags, cartons, rubber rings, etc., should also be selected according to the packaging requirements. For example, the goods sent abroad need to be packed in double-layer cartons.

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