Terminal plastic insulating material and the conductive member is directly related to the quality of the terminals, which are decided insulation properties and electrical conductivity of the terminals. Failure of any one of the terminals will result in failure of the whole system works. Painful lessons in this regard, domestically and internationally is very profound.
　　Prevention is the purpose of the analysis is the foundation. In a sense, the prevention of failure is more important than the analysis of the failure. Ensure the quality and reliability of the terminals have a more realistic sense.
　　Terminals from the use of perspective, the function should be achieved: contact area of ??the conductive areas must be turned on reliable contact. Insulation parts should not turned the place must be insulated and reliable. Wiring common fatal failure mode terminal has the following three:
　　1, poor contact
　　Terminals inside the metal conductor is terminal core parts, it voltage, current, or a signal from an external wires or cables transmitted to its corresponding mating connector contacts. Therefore, the contact must have excellent structure, stable and reliable contacts retention and good electrical conductivity. Since the contact unreasonable structure design, material selection errors, mold unstable machining size tolerance, surface roughness, and other surface treatment plating heat treatment process is unreasonable, improper assembly, improper use and operation of the storage harsh environment, will be in contacts the matching portion of the contact area and cause poor contact.
　　2, poor insulation
　　The role of the insulator is to maintain the correct position of the contact member are arranged, and between the contact member and the contact member in contact with each other between the insulating member and the housing. Therefore insulating member must have excellent electrical properties, mechanical properties and molding process performance. Especially with the effective thickness of high-density, extensive use of small terminals, insulators increasingly slim. This insulation material, plastic injection molding and other precision molds and made more restrictive and burdensome requirements. Since the metal extra material, surface dust, moisture and other pollution flux, organic material precipitates and harmful gas adsorption membrane fusion with the surface film of water to form an ion conductive channel, absorb moisture, mildew, aging of insulation materials and other reasons the presence of the insulator surface or inside, It can cause a short circuit, leakage, breakdown, poor insulation and low insulation resistance.