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The surface treatment process used for FPC cables is generally immersion gold, and occasionally has anti-oxidation. However, the anti-oxidation process cannot withstand high temperatures, and its environmental tolerance is worse than that of immersion gold, and the price of the two is similar. Therefore, most of them use the immersion gold process. In addition, there are processes such as tin plating and tin spraying, but the temperature resistance of FPC is generally below 280 degrees Celsius, while the temperature of spraying tin will be above 300 degrees Celsius, and the hardness of the solder paste is relatively small, so it is rarely used.