Solder

Solder, or solder wire, is a fusible metal alloy with a low temperature melting point used to permanently join two metals that have a higher melting point. Soldering is a process commonly used in the electronics industry for PCBs and electronics components, jewellery manufacturing and pipework in plumbing, with the majority of soldering carried out through the use of a soldering iron.

Our range of solder wire contains products from industry leaders like Felder Lottechnik, MBO, Multicore, Weller and RS PRO, with a variety of wire diameters (ranging from 0.23mm to 7mm) and lead content (0% to 70%).

What is solder made of?

The alloys used in solder vary depending on the manufacturer and the intended application, as different applications require different materials.

Soft solder is commercially available at varying concentrations of tin, ranging from 5% to 70%. Higher percentages of tin provide greater tensile strength, with a 60/40 balance being a popular composition.

Lead-free solder is also available, created due to the call to remove or reduce hazardous materials in consumer electronics, which often has a lower melting point than lead-based alloys. Lead-free solder wire may contain copper, zinc, tin, silver, bismuth, antimony and/or traces of other materials depending on its intended use.

What is flux?

In order to prevent the oxidation of the metal alloy and ensure a strong electrical connection and high mechanical strength, soldering wire contains a flux, which can be made of different materials. A flux is a chemical agent that will help to reduce metal oxides (return oxidised metals to their original state) and seal out air from the join, preventing any further oxidation.

There are two main types of flux: acid/active, which contains strong acids and is used in plumbing and metal mending, and rosin/passive, which is used in electronics.

What forms of solder are there?

The majority of solder comes in wire form, with a range of wire diameters available to suit various applications and joints. Solder granules are ideal for soldering machines and tinning crucibles, but these small pellets of solder popular for jewellery making too. Paste solder is ideal for use in printed circuit boards (PCBs) and connecting surface mount electronic components. It is a sticky paste which is applied to a board by printing or painting.


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Description Price Model Number Wire Diameter Percent Lead Product Form Melting Point Percent Silver Percent Tin Flux Type Product Weight Flux Content Percent Percent Copper
RS Stock No. 788-3704
Mfr. Part No.T0051388199
BrandWeller
£27.62
1 Reel of 1
Reel(s)
WSW SAC M1 0.3mm - Wire 217°C 3% 96.5% Rosin 100g 3.5% 0.5%
RS Stock No. 788-3708
Mfr. Part No.T0051388299
BrandWeller
£27.62
1 Reel of 1
Reel(s)
WSW SAC M1 0.5mm - Wire 217°C 3% 96.5% Rosin 100g 3.5% 0.5%
RS Stock No. 788-3717
Mfr. Part No.T0051388399
BrandWeller
£27.62
1 Reel of 1
Reel(s)
WSW SAC LO 0.3mm - Wire 217°C 3% 96.5% Rosin 100g 3.5% 0.5%
RS Stock No. 788-3723
Mfr. Part No.T0051388699
BrandWeller
£48.68
1 Reel of 1
Reel(s)
WSW SAC M1 1mm - Wire 217°C 3% 96.5% Rosin 100g 3.5% 0.5%
RS Stock No. 788-3710
Mfr. Part No.T0051388499
BrandWeller
£27.62
1 Reel of 1
Reel(s)
WSW SAC LO 0.5mm - Wire 217°C 3% 96.5% Rosin 100g 3.5% 0.5%
RS Stock No. 788-3714
Mfr. Part No.T0051388599
BrandWeller
£48.68
1 Reel of 1
Reel(s)
WSW SAC M1 0.8mm - Wire 217°C 3% 96.5% Rosin 100g 3.5% 0.5%
RS Stock No. 788-3726
Mfr. Part No.T0051388799
BrandWeller
£48.68
1 Reel of 1
Reel(s)
WSW SAC LO 0.8mm - Wire 217°C 3% 96.5% Rosin 100g 3.5% 0.5%
RS Stock No. 788-3720
Mfr. Part No.T0051388899
BrandWeller
£48.68
1 Reel of 1
Reel(s)
WSW SAC LO 1mm - Wire 217°C 3% 96.5% Rosin 100g 3.5% 0.5%
RS Stock No. 175-7102
Mfr. Part No.T0051401399
BrandWeller
£18.08
Each
Units
WSW SCN M1 0.8mm - Wire 227°C - 99.3% Lead Free Sn0.7Cu 100g 2.3 → 3.7% 0.7%
RS Stock No. 2550520785
Mfr. Part No.T0051302699
BrandWeller
£44.71
Each
Units
- - - - - - - - - - -
RS Stock No. 2550520787
Mfr. Part No.T0051302899
BrandWeller
£32.78
Each
Units
- - - - - - - - - - -