How to distinguish inferior terminal

Terminal blocks are the most basic items for purchasing personnel working in the electrical field. Because of the function of transmitting signals, any electrical can not do without terminal blocks. The appearance of terminal products can not be described by color, but you can see the shape, color, smoothness and other factors of the appearance. Generally speaking, the terminal shape is regular, no concave and convex plane, no burr is preferred; Color check whether it is the color you need, there is no color difference; Whether the coating of conductive parts is uniform, whether due to the bad storage time or storage environment rust; Terminal needle distance size is consistent with the national standard creepage distance, needle distance is uniform.
To smell means to smell. In order to save cost, some businesses will be used for many times to do the production of raw materials to shape the terminal, in order to cover up the taste of the material, add aromatic agent in it, this terminal will smell a light fragrance after getting. Encounter this kind of terminal, should distinguish seriously.