Common connector plastic materials

In different use scenarios, the material selection of the connector will be quite different. The housing of the connector is the main part of the whole connector, which roughly determines the size and size of the connector. Next, Xiaobian introduces five common plastic materials for connectors, which contain very important technical knowledge, whether purchasers, engineers, or enterprises, to learn technical knowledge. Connector plastic materials are usually LCP/Nylon/PPS/PBT/PET. (1) LCP liquid crystal polymer LCP is an excellent electrical insulation material, which can maintain its electrical characteristics between 200-300 ℃ without being affected, and can be used intermittently up to 316 ℃. In addition, LCP is extremely resistant to corrosion and will not corrode in 90% acidic or 50% alkaline environments. LCP also has excellent thermal stability, heat resistance, and chemical resistance. (2) Nylon Nylon has good toughness, self-lubrication, chemical resistance and wear resistance. The toughness of PA6T is better than that of PA9T, and the heat distortion temperature is 290 ℃, which is suitable for SMT connectors. PA46 products have high strength, good toughness and are not easy to crack. (3) PPS excellent: good rigidity, low water absorption, good dimensional stability, HDT 260 ℃, excellent flame retardant performance. Deficiency: slow crystallization speed, easy hairiness and poor toughness. (4) PBTPBT is a crystalline engineering plastic. Melting point significant (215-235 ℃). It has low viscosity in molten state, good fluidity and low hygroscopicity, and can maintain good electrical stability under humid and high temperature conditions. Lack: large shrinkage after molding. Because the heat resistance is not high, it can not be used in SMT. It can only be used in DIP type connectors (D-SUB25P, DR-9P, etc.) (5) PET crystalline engineering plastic, melting point 245-260 ℃. Good mechanical, electrical and solvent resistance. Lack: Anisotropy, large shrinkage. The crystallization rate is slow. The requirement for drying is high. The plastic materials of the above five connectors are common. To sum up, we can conclude that the principle of choosing which material is: 1. Good fluidity (such as LCP, nylon, etc., which can be made into thin-walled products) 2. High strength and good impact. 3. High temperature resistance (especially SMT) 4. Excellent electrical performance (high resistance, low dielectric loss) 5. Short molding cycle (improve productivity and reduce costs) 6. If the performance meets the requirements, the price will be advantageous.

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