... the reflow soldering, can also in the nitrogen the backflow, after the backflow, does not need to clean.FT-766 lead-free ... can guarantee the soldering paste long-term stability. characteristic: broad backflow craft window, perfect reflow soldering effect. may print high ... 20-32°C the room temperature environment.Characteristic:1.broad backflow craft window, perfect reflow soldering effect.2.may print ...