Analysis Of Basic Materials For Terminal Blocks
Conductive materials
There is no risk of stress rupture due to various molding requirements and electrical requirements in use. The surface of copper conductive parts is coated with tin alloy, which can ensure good contact performance and low contact resistance. Tin alloy coating not only has good electrical properties, but also has good corrosion resistance. Tin alloy surface treatment can protect the solderability of printed circuit board terminals and connector pins. In order to increase the wear resistance of connector plug-in, tin alloy is also used in this part. This treatment can also maintain long-term solderability.
Insulation material of terminal block
In order to meet the actual requirements of different products, different materials can be selected according to the specific application. Nylon 6.6 is preferred as the best insulation material for terminal and connector housing. It is also recognized by almost all international testing organizations. Due to its excellent anti leakage and leakage current breakdown capability, it reaches CTI 600 according to iec112 standard, thus reducing the creeping distance between air and leakage current. It has been used as the basic material of terminal blocks. Nylon 6.6 is elastic, rigid and resistant to most chemical agents and is classified as extinguished V-O or (V-2) according to UL94. The modified nylon 6.6 used in the terminal block does not contain halogen, fluorocarbon, chlorine, carbohydrate, silicone, asbestos, cadmium and formaldehyde. Therefore, all the insulation materials used in the terminal block do not contain toxic components.
Spring holding material
All clamping springs used in terminal blocks are made of high quality, carefully selected and reliable nickel chromium spring steel CrNi. It has high tensile strength and high corrosion resistance proved by many years of practical experience. It can resist sea salt fog, urban exhaust gas and industrial gases sulfur dioxide and hydrogen sulfide. At the normal temperature of 22 ℃, it can resist 30% brine solution and 30% dilute phosphoric acid.
