Common Solder, Lead-Based, 40% Tin 60% Lead, Solid Core, 0.09375" Dia.With some exceptions, the tin lead solders can be used to solder copper and most copper alloys, lead, nickel alloys and steel Heat sources include soldering guns, irons and torch applications Acid Core: For soldering materials with poor solderability, stainless steel application Rosin Core: For electrical application Tin Antimony 95 5: Useful for applications where moderately elevated temperatures is a factor. It has a high electrical conductivity and