Soldering & Flux Safety

Purpose

Establish safety procedures specific to soldering and brazing operations at Spartan Plumbing, including chemical safety for flux, solder, and related materials.

When to Use

• Any soldering or brazing operation
• When handling flux, solder wire, solder paste, or brazing rods
• Cleaning up after soldering work

Chemical Hazards

Flux

• Flux contains corrosive chemicals (zinc chloride, ammonium chloride, rosin) that can irritate skin, eyes, and lungs
• Flux fumes are hazardous — always work in ventilated areas
• Avoid skin contact — wash hands after handling

Lead-Free Solder

• Modern solder is lead-free but still contains tin, silver, and copper compounds
• Fumes from heated solder should not be inhaled — use ventilation
• Wash hands after handling solder, especially before eating

Old Solder (Pre-1986 Homes)

• Solder in homes built before 1986 may contain lead
• When removing or reheating old solder joints, the fumes may contain lead
• Use additional ventilation and consider a respirator for extensive old solder work

Procedure

Safe Soldering Practices

Work in a ventilated area — open a window, use a fan, or work near an open door

Wear safety glasses — hot flux and solder can splatter

Use heat-resistant leather gloves when handling hot pipes and fittings

Apply flux sparingly — excess flux creates more fumes and splatter

Use a heat shield behind every joint near combustible materials

Keep a wet rag and spray bottle nearby for cooling and fire prevention

Never touch freshly soldered joints — they remain hot for several minutes

Cleanup

Wipe excess flux from completed joints with a damp rag

Excess flux left on pipes can cause corrosion over time

Dispose of used flux containers per Hazardous Waste Disposal procedures

Clean your hands and tools before eating or touching your face

First Aid

Flux on skin: wash with soap and water immediately

Flux in eyes: flush with water for 15 minutes, seek medical attention

Solder burn: run cool water over the burn, apply burn cream from first aid kit

If you feel dizzy or nauseated from fumes, move to fresh air immediately

Important Notes

• Lead-free solder is required by code for potable water systems — never use lead solder on drinking water lines
• Keep your flux container closed when not in use to prevent contamination and fumes
• Soldering generates enough heat to start fires — always follow Hot Work Permits & Procedures
• Replace your soldering torch tip when worn — a clean tip provides better heat control and reduces splatter

Related SOPs

• Hot Work Permits & Procedures — fire prevention during soldering
• Chemical Handling & Storage — general chemical safety
• PPE Requirements — soldering-specific PPE
• SDS (Safety Data Sheets) Access & Use — flux and solder SDS information