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A little silver, a lower melting point

Ka wah core Lead-free silver solder wire Sn99 Ag0.3 Cu0.7, 1.0 mm, 2 % flux, 100 g

A 100 g reel of lead-free solder wire from Ka wah core in Sn99 Ag0.3 Cu0.7 with a 2.0 % rosin-core flux, 1.0 mm thick and a stated melting point of 217 °C, for ICs, circuit boards and hobby soldering.

Unbranded green reel labelled lead free solder wire, WT 100 g, flux 2.0 %, 1.0 mm ticked

Ka wah core Lead-free silver solder wire Sn99 Ag0.3 Cu0.7, 1.0 mm, 2 % flux, 100 g

A 100 g reel of lead-free solder wire from Ka wah core in Sn99 Ag0.3 Cu0.7 with a 2.0 % rosin-core flux, 1.0 mm thick and a stated melting point of 217 °C, for ICs, circuit boards and hobby soldering.

Alloy
Sn99 Ag0.3 Cu0.7, lead-free, first bullet
Melting point
217 °C (422.6 °F), second bullet
Diameter
1.0 mm (0.039 in), title and second bullet
Flux type and percentage
Rosin core, 2.0 %, first bullet
Net weight
Absent from the listing — 100 g gross, second bullet
Handling guidance
Absent from the listing — lead-free wire is called safer than leaded, fourth bullet
Amazon reference
B0BX9G3WDQ (same reference on 5 Amazon marketplaces)
EAN
0732214071186
  • A silver-bearing alloy at a stated 217 °C
  • Flux share stated: 2.0 %
  • Weight given as gross only

Best for: A hobbyist who solders regularly and wants a silver-bearing lead-free wire in a larger reel.

≈ 16 €
Check price on Amazon

Specifications

Alloy
Sn99 Ag0.3 Cu0.7, lead-free, first bullet
Melting point
217 °C (422.6 °F), second bullet
Diameter
1.0 mm (0.039 in), title and second bullet
Flux type and percentage
Rosin core, 2.0 %, first bullet
Net weight
Absent from the listing — 100 g gross, second bullet
Handling guidance
Absent from the listing — lead-free wire is called safer than leaded, fourth bullet
Amazon reference
B0BX9G3WDQ (same reference on 5 Amazon marketplaces)
EAN
0732214071186

The Ka wah core solder listing, bullet by bullet

Five bullets: an Sn99 Ag0.3 Cu0.7 rosin-core wire with 2.0 % flux; 100 g gross, 1.0 mm and a melting point of 217 °C; good flow and even heating; a comparison with leaded wire, brighter in colour; and uses in ICs, circuit boards and hobby work.

Ka wah core’s silver

0.3 % silver, 217 °C. A small silver share lowers the melting point against plain tin-copper at 227 °C. The goobay reel on this site uses the same 0.3 % silver and 0.7 % copper.

Ka wah core’s numbers

The 100 g is a gross weight, and no net weight is given, so the solder on the reel is less than 100 g by an unstated amount.

Availability

At the last look-up, the German, French, Italian and Spanish Amazon stores were asking 16 € to 21 €.

The British Amazon catalogue lists the product, yet no seller was offering it.

The American Amazon store returned no entry, so the buy button there opens a search rather than a missing page.

Every figure here is Keepa’s reading on the date this page was last updated. Stock and prices can change at any time.

Prices quoted in this text were read on 15 September 2026. The live price is at the top of the page.

More solder wire

  • AIYHSW reel labelled Sn99.3 Cu0.7, flux 2.0 %, lead-free, WT 20 g, DIA 0.8 mm

    AIYHSW Lead-free solder wire Sn99.3 Cu0.7, 0.8 mm, 20 g, rosin core

    A 20 g reel of lead-free solder wire from AIYHSW in Sn99.3 Cu0.7, 0.8 mm thick, with a no-clean rosin core and a stated melting point of 227 °C, for cable, circuit board and small electronics repair.

    Alloy
    Sn99.3 Cu0.7, lead-free, title and first bullet
    Melting point
    227 °C, third bullet
    Diameter
    0.8 mm, title and first bullet
    Flux type and percentage
    Rosin core, no-clean formula, second bullet; the reel label in the product photograph reads FLUX 2.0 %
    Net weight
    20 g, title and first bullet
    Handling guidance
    Absent from the listing — “no toxic gas” and “no odour” are the seller’s wording, fourth bullet
    Amazon reference
    B0H6FHB7MX (same reference on 6 Amazon marketplaces)
    EAN
    0714047028612
    • Alloy, diameter and melting point all given
    • No-clean rosin core
    • Flux percentage only on the reel label

    Best for: An occasional repairer who needs a small reel of lead-free solder for cables and boards.

    ≈ 5 €
    Check price on Amazon
  • FELDER ISO-Core Ultra-Clear reel, 0.50 mm, 0.100 kg, 2.2 % flux, Sn100Ni+, distributed by GALLUNOPTIMAL

    GALLUNOPTIMAL Lead-free solder wire Sn100Ni+, 0.5 mm, 2.2 % halogen-free flux, 100 g, made by FELDER

    A 100 g reel of Sn100Ni+ lead-free solder wire from GALLUNOPTIMAL, made by FELDER in Germany: Sn99.25 Cu0.7 Ni0.05, 0.5 mm, with 2.2 % halogen-free Ultra-Clear REL0 active flux and a melting point of 227 °C, to EN ISO 9454-1.

    Alloy
    Sn100Ni+, micro-alloyed Sn99.25 Cu0.7 Ni0.05, lead-free, first bullet; the reel label in the product photograph reads Sn99.3CuNiGe
    Melting point
    227 °C, third bullet
    Diameter
    0.5 mm, title and fourth bullet
    Flux type and percentage
    2.2 % Ultra-Clear active flux, REL0, halogen-free, second bullet
    Net weight
    100 g reel, title and fourth bullet
    Handling guidance
    Absent from the listing — EN ISO 9454-1 and 1222 named, fifth bullet
    Amazon reference
    B0F8JFHR8M (same reference on 6 Amazon marketplaces)
    EAN
    4250078313038
    • Full alloy with nickel micro-addition: Sn99.25 Cu0.7 Ni0.05
    • Flux class given: REL0, halogen-free, 2.2 %
    • No handling guidance

    Best for: A maker soldering fine electronics who wants an alloy and flux described to a standard.

    ≈ 19 €
    Check price on Amazon
  • Green CHANXUAN reel labelled lead-free, WT 30 g, flux 2.0 %, 0.6 mm ticked

    CHANXUAN Lead-free solder wire Sn99.3 Cu0.7, 0.6 mm, 2 % rosin flux, 20 g net

    A reel of lead-free Sn99.3 Cu0.7 solder wire from CHANXUAN, 0.6 mm with 2 % rosin flux and a melting point of about 227 °C, for a working temperature of 380 ± 20 °C, with 20 g of solder on a 30 g gross reel.

    Alloy
    Sn99.3 Cu0.7, lead-free, title and first bullet
    Melting point
    About 227 °C, third bullet
    Diameter
    0.6 mm, title and fifth bullet
    Flux type and percentage
    2 % rosin flux, low-residue formula needing no cleaning, first and fourth bullets
    Net weight
    20 g net, 30 g gross, fifth bullet; 30 g in the title
    Handling guidance
    Absent from the listing — a working temperature of 380 ± 20 °C is given, third bullet
    Amazon reference
    B0GZ2MHTH5 (same reference on 5 Amazon marketplaces)
    EAN
    0761578230731
    • A working temperature given: 380 ± 20 °C
    • Flux share stated: 2 % rosin
    • 30 g in the title is the gross weight; 20 g is solder

    Best for: A maker soldering small pads and SMD leads who wants a fine wire and an iron setting to start from.

    ≈ 6 €
    Check price on Amazon

Elsewhere on the workbench

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    Iron fit
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    Cartridge or bare tip
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    Shape
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    Size
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    Plating
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    Pack contents
    5 tips, fifth bullet
    Amazon reference
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    EAN
    6943862537434
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    Best for: The owner of a basic 30 W iron who can match the tip against the old one before ordering.

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    Check price on Amazon
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    Iron fit
    fixpoint soldering station AP2, article 51091, title and first bullet
    Cartridge or bare tip
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    Shape
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    Size
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    Plating
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    Amazon reference
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    EAN
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    • Four shapes from fine pencil to wide bevel
    • Plating not named

    Best for: A fixpoint AP2 station owner, or anyone who can match a 4.8 mm shank and 6.6 mm collar.

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  • Box of brass inserts labelled 450PCS Hot Melt Nut Kit with a size table, seven brass tips, two adapters, tweezers, a 60 W iron and a stand with sponge

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    Iron fit
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    Cartridge or bare tip
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    Shape
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    Size
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    Plating
    Absent from the listing text — the tips in the product photograph are brass-coloured
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    B0H6BLFQN8 (same reference on 4 Amazon marketplaces)
    EAN
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