针筒锡膏 Sn63Pb37

针筒锡膏 Sn99Ag0.3Cu0.7

针筒锡膏 Sn96.5Ag3Cu0.5

针筒锡膏 Sn42Bi58

针筒锡膏 Sn60Pb40

针筒锡膏 Sn98.5Ag1Cu0.5