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. 756-8884
BrandRS PRO
MYR241.47
Each
units
SAC305 0.71mm - Wire 217°C 3% 96.5% Rosin Based 250g 2.2% 0.5%
RS Stock No. 818-3194
BrandRS PRO
MYR147.63
Each
units
- 0.8mm 40% - 183 → 188°C - 60% - 100g 2.2% -
RS Stock No. 756-8904
BrandRS PRO
MYR115.47
Each
units
NC600 0.71mm 40% Wire 183°C - 60% Rosin Based 250g 2.2% -
RS Stock No. 800-7664
BrandRS PRO
MYR154.27
Each
units
NC600 SN100E 1.01mm - Wire 228°C - 99.5% Rosin Based 250g 3.3% 0.5%
RS Stock No. 756-8881
BrandRS PRO
MYR94.58
Each
units
NC600 1.27mm 40% Wire 183°C - 60% Rosin Based 250g 2.2% -
RS Stock No. 800-7677
BrandRS PRO
MYR153.97
Each
units
NC600 SN100E 0.81mm - Wire 228°C - 99.5% Rosin Based 250g 3.3% 0.5%
RS Stock No. 756-8862
BrandRS PRO
MYR305.98
Each
units
SN100E NC600 0.81mm - Wire 228°C - 99.5% Rosin Based 500g 3.3% 0.5%
RS Stock No. 818-3204
BrandRS PRO
MYR33.95
Each
units
SN100E 0.8mm - - 227°C 3% 96.5% - 100g 3.3% 0.5%
RS Stock No. 756-8890
BrandRS PRO
MYR282.80
Each
units
NC600 1.27mm 40% Wire 183°C - 60% Rosin Based 500g 2.2% -
RS Stock No. 756-8887
BrandRS PRO
MYR206.04
Each
units
NC600 SN100E 0.38mm - Wire 228°C - 99.5% Rosin Based 250g 3.3% 0.5%
RS Stock No. 756-8865
BrandRS PRO
MYR300.64
Each
units
SN100E NC600 1.27mm - Wire 228°C - 99.5% Rosin Based 500g 3.3% 0.5%
RS Stock No. 756-8875
BrandRS PRO
MYR293.93
Each
units
SAC305 NC600 0.38mm - Wire 217°C 3% 96.5% Rosin Based 250g 2.2% 0.5%
RS Stock No. 800-7661
BrandRS PRO
MYR92.47
Each
units
NC601 0.71mm 40% Wire 183°C - 60% Colophony Free- ORL0 250g 2 → 4% -
RS Stock No. 756-8893
BrandRS PRO
MYR473.49
Each
units
SAC305 NC600 0.71mm - Wire 217°C 3% 96.5% Rosin Based 500g 2.2% 0.5%
RS Stock No. 800-7668
BrandRS PRO
MYR150.53
Each
units
NC600 SN100E 1.27mm - Wire 228°C - 99.5% Rosin Based 250g 3.3% 0.5%
RS Stock No. 800-7652
BrandRS PRO
MYR118.30
Each
units
NC601 1.27mm 40% Wire 183°C - 60% Colophony Free- ORL0 250g 2 → 4% -
RS Stock No. 756-8900
BrandRS PRO
MYR216.78
Each
units
NC600 0.71mm 40% Wire 183°C - 60% Rosin Based 500g 2.2% -
RS Stock No. 800-7642
BrandRS PRO
MYR473.78
Each
units
SAC305 NC600 1.01mm - Wire 217°C 3% 96.5% Rosin Based 500g 2.2% 0.5%
RS Stock No. 756-8907
BrandRS PRO
MYR224.67
Each
units
NC600 0.38mm 40% Wire 183°C - 60% Rosin Based 250g 2.2% -
RS Stock No. 756-8913
BrandRS PRO
MYR253.22
Each
units
SAC305 NC600 1.27mm - Wire 217°C 3% 96.5% Rosin Based 250g 2.2% 0.5%