SGS environmentally friendly solder paste meets international requirements. It is tested by SGS and MSDS. The solder joints are full without slump, no residue, no irritating odor, no cleaning after soldering, no soldering or false soldering. Uses: It can be used for general instrumentation, welding on copper, tin, iron, stainless steel and other metal tools. Usage: Before welding, wipe the surface of the object, apply the paste to the copper, tin, iron and other metals, and then use the electric iron to melt the tin in the joint.