With the increasing emphasis on environmental protection in today's world, the electronics industry has evolved from theory to practice in lead-free processes, making the lead-free process more widely used by electronics manufacturers. The 527 series of lead-free flux-free fluxes are developed using the latest environmental concepts and methods. The flux has high temperature resistance to the connection of lead-free solder and has a good function in helping lead-free solder from diffusion, wetting, chemical, active and thermal stability.