... flow rate tin welding bar for PCB board1:good humidity,bright beautiful,fast 2:and high isolation resist Shenzhen ... engineering of electronics,communication,electric appliances,electric instruments and meters. tin weilding powder Sn63Pb37(soldering material)Accordance with the ... RMA grade of GB-T3131-2001.Waving soldering wire:Good humidity, bright soldering point, beautiful, fast, no halogen, no ...