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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Viewing 61 - 80 of 239 products
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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. 179-6668
BrandRS PRO
£30.49
Each
Units
- 0.5mm 40% Wire 183°C - 60% Rosin 500g 2.2% -
RS Stock No. 179-6677
BrandRS PRO
£12.36
Each
Units
- 0.7mm 40% Wire 183°C - 60% Rosin 250g 3.3% -
RS Stock No. 619-5615
Mfr. Part No.291340
BrandMulticore
£17.25
1 Reel of 250 Gram(s)
Reel(s)
362 1.2mm 40% Wire 183°C - 60% Rosin Based 250g 3% -
RS Stock No. 555-235
Mfr. Part No.288322
BrandMulticore
£40.20
1 Reel of 500 Gram(s)
Reel(s)
362 0.7mm 40% Wire 183-188°C - 60% Halogen Free 500g 3% -
RS Stock No. 554-923
Mfr. Part No.288380
BrandMulticore
£39.91
1 Reel of 500 Gram(s)
Reel(s)
362 1.2mm 40% Wire 183-188°C - 60% Halogen Free 500g 3% -
RS Stock No. 436-4926
Mfr. Part No.442578
BrandMulticore
£40.69
Each
Units
105 0.5mm 0% Wire +217°C 3.8% 95.5% Halogen Free 250g 1.5% 0.7%
RS Stock No. 436-4881
Mfr. Part No.442570
BrandMulticore
£29.00
Each
Units
362 0.5mm 40% Wire 183-188°C - 60% Activated Rosin 250g 3% -
RS Stock No. 556-503
Mfr. Part No.290715
BrandMulticore
£33.77
1 Reel of 500 Gram(s)
Reel(s)
362 1.2mm 93.5% Wire 296-301°C 1.5% 5% Water Wash 500g 3% -
RS Stock No. 273-255
Mfr. Part No.YC00220
£2.58
Each
Units
YC00220 0.8mm 0% Wire 227°C - 99.25% Rosin Based 13g 2.5% 0.75%
RS Stock No. 625-8233
Mfr. Part No.342806
BrandMulticore
£86.31
1 Reel of 500
Reel(s)
105 0.7mm - Wire +217°C 3.8% 95.5% Activated Rosin Free 500g 1.5% 0.7%
RS Stock No. 185-0042
Mfr. Part No.291275
BrandMulticore
£23.43
1 Reel of 250 Gram(s)
Reel(s)
362 1.2mm - Wire +227°C - 99.3% Water Wash 250g 3% 0.7%
RS Stock No. 436-4869
Mfr. Part No.291708
BrandMulticore
£28.97
Each
Units
362 0.56mm 36% Wire 179°C 2% 62% Activated Rosin 250g 3% -
RS Stock No. 185-0070
Mfr. Part No.289807
BrandMulticore
£61.25
1 Reel of 500 Gram(s)
Reel(s)
362 0.7mm - Wire +227°C - 99.3% Activated Rosin 500g 3% 0.7%
RS Stock No. 295-4820
Mfr. Part No.288155
BrandMulticore
£40.77
Each
Units
105 0.7mm 40% Wire 183-188°C - 60% Activated Rosin 500g 3% -
RS Stock No. 512-5801
Mfr. Part No.761345
BrandMulticore
£31.30
1 Pack of 5
Pack(s)
- 7mm - Stick 227°C - 99.3% - 400g - 0.7%
RS Stock No. 436-4831
Mfr. Part No.288498
BrandMulticore
£21.37
Each
Units
C400 0.46mm 40% Wire 183-188°C - 60% Halogen Free 250g 2.2% -
RS Stock No. 229-4308
Mfr. Part No.288716
BrandMulticore
£21.86
1 Reel of 1
Reel(s)
C511 0.7mm 40% Wire 183-188°C - 60% Water Wash 250g 3% -
RS Stock No. 625-8132
Mfr. Part No.289703
BrandMulticore
£93.34
1 Reel of 500
Reel(s)
105 1mm - Wire +217°C 3.8% 95.5% Activated Rosin 500g 1.5% 0.7%
RS Stock No. 185-0109
Mfr. Part No.291286
BrandMulticore
£20.03
Each
Units
Hydro-x 0.7mm 40% Wire 183-188°C - 60% Water Wash 250g 2% -
RS Stock No. 555-276
Mfr. Part No.SN96.5 AG3 CU0.5 7/10 A11 - 100G
BrandMBO
£8.57
1 Reel of 100 Gram(s)
Reel(s)
SN96.5 AG3 CU0.5 0.7mm - Wire 217°C 3% 96.5% Rosin 100g 2.2% 0.5%
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