Weldcote 60/40 Tin/Lead Solid Solder Is Used Extensively For Electrical Applications. With Some Exceptions, Tin-Lead Solders Can Be Used To Solder Copper And Most Copper Alloys, Lead, Nickel Alloys, And Steel. The 60/40 Solder Is Also Used For Wave Dip Soldering On Electrical Assemblies Where Lower Temperatures Are Required. The Tin-Lead Solders Are Not Recommended In High Stress Or Vibration Joints In The Cooling Industry Due To The Lack Of Sufficient Elongation Properties. This Product Contains Lead And Should Not Be Used In Potable Water Systems.