30/70 Tin Solder

30/70 tin solder is an ASTM B32 Sn30 tin-lead alloy formulated for soft soldering work where a wide pasty range and good manual bead control are needed. It is used in radiator repair, sheet metal work, bodywork, sealing galvanized sheet and traditional plumbing not intended for potable water. Compared with 40/60 or 50/50, it contains less tin and more lead, making it more suitable when the operator needs to fill, shape or even out the joint before it solidifies. It must not be selected for drinking-water networks or projects requiring lead-free material; in those cases, tin-copper, tin-silver or tin-antimony alternatives under ASTM B32 should be reviewed.

Selection guide

• Choose 30/70 when filling capacity and manual finishing are more important than fast fluidity.
• For fine electronics, prefer a eutectic alloy such as 63/37.
• For potable water or food, request a lead-free alloy compatible with the project specification.
• Confirm whether bar, spool or special packaging is required before quoting.

Use recommendations

• Clean rust, grease, paint and moisture before applying flux.
• Heat the base part uniformly; do not melt the solder only with the direct flame.
• Use flux compatible with copper, brass, tinned steel or galvanized sheet.
• Remove flux residues after finishing to reduce the risk of localized corrosion.

SoldaForce supplies 30/70 solder by kilogram or packaging according to availability for industrial maintenance, workshops and contractors. We dispatch to Bogotá, Medellín, Cali, Barranquilla and all of Colombia. Request a quote via WhatsApp indicating application, base metal and required packaging.