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A standard and a flux class named

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.

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 €
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Specifications

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

The GALLUNOPTIMAL Sn100Ni+ listing, bullet by bullet

Five bullets: a micro-alloyed lead-free Sn100Ni+ wire, Sn99.25 Cu0.7 Ni0.05, for hand soldering; 2.2 % Ultra-Clear REL0 active flux, halogen-free; a melting point of 227 °C from first-melt alloy; a 0.5 mm wire on a 100 g reel; and manufacture by FELDER GmbH in Oberhausen, to EN ISO 9454-1 and 1222.

GALLUNOPTIMAL classes its flux

REL0. Flux classes describe the base and activity; REL0 is a resin-type, low-activity, halide-free flux. The listing gives the class as well as the percentage, which lets the flux be compared with others.

GALLUNOPTIMAL at 0.5 mm

The finest wire of the six, for small pads and fine pitch. It is also the only one to name the standards it is made to. The FELDER reel in the product photograph writes the alloy as Sn99.3CuNiGe, naming germanium as well as nickel, which the bullets do not mention.

Availability

At the last look-up, the German Amazon store was asking roughly 19 €.

The American, British, French, Italian and Spanish Amazon catalogues list the product, yet no seller was offering it.

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

  • 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
  • goobay 40845 reel labelled 250 g, 0.3 % silver, lead-free, 1.0 mm

    goobay Lead-free silver solder wire Ag0.3 Cu0.7, 1 mm, 2.5 % no-clean flux, 250 g

    A 250 g reel of lead-free silver solder wire from goobay, 1 mm, with 0.3 % silver, 0.7 % copper, 96.5 % tin and 2.5 % halogen-free no-clean flux, a melting point of 217 °C and low smoke stated, for cables, boards and appliance repairs.

    Alloy
    96.5 % tin, 0.3 % silver, 0.7 % copper, lead-free, title and first bullet
    Melting point
    217 °C, title and first bullet
    Diameter
    1 mm, title and first bullet
    Flux type and percentage
    2.5 % no-clean flux, halogen-free, first and second bullets
    Net weight
    250 g reel, title and first bullet
    Handling guidance
    Absent from the listing — low smoke during soldering stated, third bullet
    Amazon reference
    B07RWKLB92 (same reference on 5 Amazon marketplaces)
    EAN
    4040849408458
    • A 250 g reel
    • No-clean, halogen-free flux at 2.5 %
    • No handling guidance beyond low smoke

    Best for: A regular solderer or small repair bench that goes through lead-free wire steadily.

    ≈ £37 / 32 €
    Check price on Amazon
  • Blue WUHANDAT reel labelled WT 50 g, flux 2.0 %, Sn99.3 Cu0.7, 1.0 mm ticked

    WUHANDAT Lead-free solder wire Sn99.3 Cu0.7, 1.0 mm, 2 % rosin flux, 30 g net

    A reel of lead-free Sn99.3 Cu0.7 solder wire from WUHANDAT, 1.0 mm with a 2 % rosin-core flux and a melting point of 227 °C, carrying 30 g of solder on a 50 g gross reel.

    Alloy
    Sn99.3 Cu0.7, lead-free, title and second bullet
    Melting point
    227 °C, fourth bullet
    Diameter
    1.0 mm, title and first bullet
    Flux type and percentage
    2 % rosin-core flux, second bullet
    Net weight
    30 g net, 50 g gross, first bullet; 50 g in the title
    Handling guidance
    Absent from the listing
    Amazon reference
    B0H14YWVQP (same reference on 4 Amazon marketplaces)
    EAN
    0761578230816
    • Flux share stated: 2 % rosin core
    • A 1.0 mm wire for general joints
    • 50 g in the title is gross; 30 g is solder

    Best for: A maker soldering wires and through-hole parts who wants a thicker lead-free wire.

    ≈ 9 €
    Check price on Amazon

Elsewhere on the workbench

  • Open 50 g tin of pale paste labelled Soldering Flux Paste, Advanced Quality ZJ-18

    LABUYI Rosin flux paste, 50 g tin, pH 7 ± 0.3

    A 50 g iron tin of lead-free rosin flux paste from LABUYI with a stated neutral pH of 7 ± 0.3, semi-solid, with less residue and little smoke, for phone, motherboard, SMT, LED and BGA repair.

    Form
    Semi-solid paste, title and third bullet
    Chemistry
    Rosin resin, lead-free, third bullet
    Residue and cleaning
    Less residue, second bullet; cleaning not addressed
    Activity level
    Absent from the listing — neutral pH 7 ± 0.3, first bullet
    Volume
    50 g net, title and first bullet
    Dispensing
    Iron tin, first bullet
    Handling guidance
    Absent from the listing — “non-toxic, safe” is the seller’s wording; application steps in the fourth bullet
    Amazon reference
    B0CBTSW7B2 (same reference on 5 Amazon marketplaces)
    EAN
    0761578202165
    • A pH figure: 7 ± 0.3
    • 50 g in a sturdy tin
    • No activity class

    Best for: A repair bench that uses paste flux daily and wants a larger tin.

    ≈ £4 / 5 €
    Check price on Amazon
  • Blue Stannol Lötfett tin marked soldering grease, 50 g, 2 oz net

    Stannol Soldering grease, 100 g tin, for copper pipe, sheet metal and brass

    A 100 g tin of soldering grease from Stannol, made of solder concentrates in mineral grease, for thick solder worked at high heat on copper pipes, sheet metal and brass.

    Form
    Grease, title
    Chemistry
    Solder concentrates in mineral grease, fourth bullet
    Residue and cleaning
    Absent from the listing
    Activity level
    Absent from the listing
    Volume
    100 g, title; the tin in the product photograph is marked 50 g (2 oz net)
    Dispensing
    Tin, title
    Handling guidance
    Absent from the listing
    Amazon reference
    B06XX9V2CP (same reference on 5 Amazon marketplaces)
    EAN
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    Best for: A workshop soldering copper pipe, sheet metal or brass with thick solder at high heat.

    ≈ £14 / 12 €
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  • NC-559-ASM 10 ml flux syringe marked no halogen, a plunger, a 5 ml syringe, three needles and a solder wick reel marked 2.5 mm × 3.0 m

    VACUBXBY NC-559-ASM no-clean flux paste 10 ml syringe with desoldering braid 2.5 mm

    A set from VACUBXBY with 10 ml of NC-559-ASM no-clean rosin flux paste in a push-in syringe with three needles, lead-free, halogen-free and non-corrosive, and a 2.5 mm oxygen-free copper desoldering braid for SMD, BGA and board rework.

    Form
    Paste in a 10 ml syringe, title and first bullet
    Chemistry
    Rosin, lead-free, halogen-free, title and third bullet
    Residue and cleaning
    No-clean, non-corrosive, third bullet
    Activity level
    Absent from the listing
    Volume
    10 ml (10 cc), title and first bullet
    Dispensing
    Push-in syringe with plunger and three needles, first and fifth bullets
    Handling guidance
    Absent from the listing text — the syringe label in the product photograph begins “Use under well ventilated conditions”; braid of 2.5 mm, 1.5 m in the title, 3 m in the first bullet and 3.0 m on the photographed reel
    Amazon reference
    B0GJZWXNKM (same reference on 6 Amazon marketplaces)
    EAN
    0759039211566
    • A syringe and needles for placing flux precisely
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    • Braid length: 1.5 m in the title, 3 m in the bullet

    Best for: A board repairer doing SMD rework who wants flux on a needle and braid to lift old solder.

    ≈ 7 €
    Check price on Amazon

All solder wire