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Relife RL-421-UV Bga Flux Paste Strong activity BGA Flux Paste for PCB, SMD, BGA Reballing Soldering, Relife RL-421-OR Soldering Paste Flux can be used for soldering and reballing of computer and phone chips. It is a mixture of high-quality alloyed powder and resinic pasty flux, it can avoid the pale yellow residue. Help to repair the circuit boards and protect the electronic components. A necessary material for repairing the mobile phone mainboard