Copper Anti-oxidants are suitable for single / double-sided flexible printed circuit board and pre-soluble flux is used to replace the traditional HASL process and oxidation treatment. The product provides a uniform dense organic protective coating (OSP) copper surface and the hole to keep leveling copper surface and prevents oxidation of the copper surface, off the copper surface after several surface mount soldering and crest After welding, still has an excellent ability to be welded, the technology has the process is simple, low cost, safe and reliable, is the PCB industry in an emerging popular process new technology. Shenzhen Yongxing Chemical Co., Ltd. Contact: Liang Sheng 15999511027 Tel: 0755-81478960