AIM CX18 63/37 Leaded Solder Wire is a no clean flux core wire solder designed to offer excellent soldering results on all surface finishes. Engineered for high operator satisfaction CX18 is a low odor/smoke formula which promotes thermal transfer, and fast wetting without the need for additional flux. CX18 post solder residues are minimal, clear and pass IPC-004A and IPC-004B SIR and corrosion requirements.