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Sn60Pb40 SW21

The most popular solder wire with flux, for professional use.

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Alloy designation in accordance with ISO 9453:2014: Sn60Pb40 (103)
Product type: Cored solder wire
Flux: SW21

1. General characteristics

The solder was produced in the first smelt of tin and lead. The composition of the solder complies with the ISO 9453:2014 standard. SW21 is organic, water-soluble based, halide activated flux. The solder is soldering most metals except aluminum and stainless steel. If used in electronics and electrotechnics it is recommended to remove flux residues. Residues of flux after soldering are water washable. It is leaded alloy for manual and automatic processes where meeting the requirements of the RoHS2 Directive is not required..
The product is intended for professional use.

2. Chemical compositions, mass fraction in %

Sn Pb Sb Bi Cd Cu Au In Ag Al As Fe Ni Zn
59,50 - 60,50 rest max 0,20 max 0,10 max 0,002 max 0,08 max 0,05 max 0,10 max 0,10 max 0,001 max 0,03 max 0,02 max 0,01 max 0,001

3. Physical characteristics

Melting point (solidus/liquidus)183/190°C
Density8,50 g/cm3
Electrical conductivity0,153 μΩ•m
Thermal conductivity49 W/m•K
Tensile strength535 kgf/cm2
Elongation at break40 %
Hardness16 HB
Suggested operating temperatures340 - 420°C

4. SW21 flux

Organic, water-soluble based, halide activated flux. Special flux composition offers good solderability on various metal surfaces excluding aluminum and its alloys. Residues of flux after soldering are water washable if cleaning is necessary or required. The flux is exceptionally well suited for flame soldering.

Flux type acc. to DIN 8511SW25
Flux type acc. to ISO 94542.1.2B
Flux type acc. to J-STD-004ORH1
Flux content2,0 +/- 0,2%; 3 cores of flux (1 core or other flux content on request)
Halide content> 2,0%
Acid Valuenot applicable
SIR test (PN-EN ISO 9455-17)no data
WashabilityRecommended washing

5. Other information

Available diameters

0,25 • 0,38 • 0,50 • 0,56 • 0,70 • 0,80 • 0,90 • 1,00 • 1,20 • 1,50 • 1,60 • 2,00 • 2,50 • 3,00 • 4,00 mm

other on request


50 g – cartons 120 pcs.
100 g – cartons 30 pcs. / 3 kg
250 g – cartons 5 kg
500 g – cartons 5 kg
1 kg – cartons 10 kg
Vial Ø1,00 mm (10g, 16g) – cartons 600 pcs

other on request

Expiration date 3 years from the end of the year of production.
for example: batch 61112233 = date of production 2016, date of expiry 2019
Label Reels and cartons marked with alloy type, flux type, diameter, net weight and batch number.
Storage Store at room temperature, in a dry place and beyond the reach of children.

Files to download:

Sn60Pb40 SW21 - Technical data sheet

Sn60Pb40 SW21 - Safety data sheet

Physical, mechanical and chemical properties available in TDS (download above).

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