Tubular lead-free solder Sn99Cu1 (solder tin) is used to connect wires for conductivity of electric current. It contains flux, thermal melting is about 215 ° C. The recommended soldering temperature is 245 ° C.
Tube solder PbSn (solder tin) is used to connect conductors for electrical current conductivity. It contains flux, melting temperature is between 183-235 degrees Celsius