20/80 Tin Solder

20/80 tin solder is an ASTM B32 Sn20 tin-lead alloy with high lead content and a wide pasty range. Its advantage is allowing filling, leveling and manual finishing in jobs where a more fluid solder would run too easily. It is suitable for radiator repair, metal bodywork, sheet metal work, surface restoration and workshop seals that are not intended for potable water or food contact. It differs from 30/70 because it is even more pasty and oriented to building volume; compared with 40/60 or 50/50, it sacrifices fluidity to gain control during shaping. Selection must consider ventilation, lead handling and compatibility with the base metal and flux.

Selection guide

• Choose 20/80 when the job requires filling or rebuilding a surface with manual control.
• Use 30/70 if a pasty option is needed, but with slightly more tin.
• Do not use it in potable water, food or lead-free specifications.
• Check whether the workshop requires bar for torch work or a different packaging.

Use recommendations

• Remove paint, grease and rust until sound metal remains in the work area.
• Apply suitable flux and heat gradually to prevent detachment.
• Shape the solder during its pasty phase with a tool appropriate to the process.
• Work with ventilation and personal protection because it is a lead-containing alloy.

SoldaForce supplies 20/80 solder for radiator shops, maintenance and specialized metal repair. We dispatch to Bogotá, Medellín, Cali, Barranquilla and all of Colombia. Request a quote via WhatsApp indicating kilograms, packaging and application.