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Five one-line bullets

BOJACK No-clean lead-free flux paste, 50 g, pH 7 ± 0.3

A 50 g pack of flux paste from BOJACK, no-clean and lead-free according to the title, with a stated neutral pH of 7 ± 0.3, for soldering electronic components, instruments and metals and for PCB, SMD and SMT repair.

Open BOJACK tin of amber paste labelled Soldering Flux Paste, Advanced Quality ZJ-18, Nw 50 g

BOJACK No-clean lead-free flux paste, 50 g, pH 7 ± 0.3

A 50 g pack of flux paste from BOJACK, no-clean and lead-free according to the title, with a stated neutral pH of 7 ± 0.3, for soldering electronic components, instruments and metals and for PCB, SMD and SMT repair.

Form
Paste, title and first bullet
Chemistry
Absent from the listing — lead-free, title
Residue and cleaning
No-clean, title
Activity level
Absent from the listing — neutral pH 7 ± 0.3; “no corrosion” stated, second and fourth bullets
Volume
50 g (1.8 oz), title and second bullet
Dispensing
Absent from the listing text — the product photograph shows a screw-top metal tin
Handling guidance
Absent from the listing — “non-toxic” is the seller’s wording, fourth bullet
Amazon reference
B09P4LJG36 (same reference on 5 Amazon marketplaces)
EAN
0762917045382
  • A pH figure: 7 ± 0.3
  • No-clean and lead-free, as the title says
  • Flux chemistry not named

Best for: A hobbyist soldering boards who wants a no-clean paste in a medium quantity.

≈ £7 / 8 €
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Specifications

Form
Paste, title and first bullet
Chemistry
Absent from the listing — lead-free, title
Residue and cleaning
No-clean, title
Activity level
Absent from the listing — neutral pH 7 ± 0.3; “no corrosion” stated, second and fourth bullets
Volume
50 g (1.8 oz), title and second bullet
Dispensing
Absent from the listing text — the product photograph shows a screw-top metal tin
Handling guidance
Absent from the listing — “non-toxic” is the seller’s wording, fourth bullet
Amazon reference
B09P4LJG36 (same reference on 5 Amazon marketplaces)
EAN
0762917045382

The BOJACK flux listing, bullet by bullet

Five bullets: flux paste; a neutral pH of 7 ± 0.3 and 50 g net; soldering electronic components against oxidation, easing solder flow; described as non-toxic and non-corrosive, with good insulation; and uses from instruments to phone PCB, SMD and SMT repair.

BOJACK and LABUYI

The same pH, the same 50 g. Both listings give pH 7 ± 0.3 and 50 g. LABUYI names rosin and an iron tin; BOJACK names neither.

What BOJACK leaves out

No base chemistry, no container, no class in the text. The no-clean claim sits in the title. The product photograph shows a BOJACK metal tin with the same ZJ-18 label as the unbranded YSHODGU and LABUYI tins.

Availability

At the last look-up, the German, French, Italian and Spanish Amazon stores were asking 8 € to 10 €.

It is sold in the British Amazon store as well, in its own currency, which the euro figures above leave out on purpose.

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 soldering flux

  • FELDER Lötfett 20 g tin with a corrosive hazard pictogram, the word Gefahr and a zinc chloride content line

    GALLUNOPTIMAL Corrosive soldering grease F-SW 12 for copper and copper alloys, 20 g

    A 20 g tin of soldering grease from GALLUNOPTIMAL, made by FELDER in Germany, classed corrosive to F-SW 12, for soft soldering copper, brass, bronze and copper alloys in installation, repair and model work, with thorough cleaning of joints required.

    Form
    Grease, title
    Chemistry
    Active flux components, classed F-SW 12, second bullet; the tin in the product photograph states zinc chloride and DIN EN 29454.1, 3.1.1.C
    Residue and cleaning
    Corrosive; thorough cleaning of the joints required, second bullet
    Activity level
    Corrosive active flux, F-SW 12, title and second bullet
    Volume
    20 g, title and fourth bullet
    Dispensing
    Tin, fourth bullet
    Handling guidance
    Absent from the listing text — the tin in the product photograph carries a corrosive pictogram, the signal word Gefahr, a warning of serious eye damage and instructions to wear protective gloves, clothing and eye protection
    Amazon reference
    B0DZPL52G4 (same reference on 6 Amazon marketplaces)
    EAN
    4250078327714
    • A flux class given: F-SW 12, corrosive
    • Cleaning requirement stated plainly
    • Corrosive: residues must be cleaned off

    Best for: A model maker or repairer soft-soldering copper and brass who will clean every joint afterwards.

    ≈ 6 €
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  • 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
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    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
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    EAN
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    • 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 €
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    Form
    Grease, title
    Chemistry
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    Residue and cleaning
    Absent from the listing
    Activity level
    Absent from the listing
    Volume
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    Dispensing
    Tin, title
    Handling guidance
    Absent from the listing
    Amazon reference
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    EAN
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    Best for: A workshop soldering copper pipe, sheet metal or brass with thick solder at high heat.

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    Check price on Amazon

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    Iron fit
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    Cartridge or bare tip
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    Shape
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    EAN
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    Check price on Amazon
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    Iron fit
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    Plating
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    EAN
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    Base polymer
    PLA, title and fourth bullet
    Filler
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    Nozzle requirement
    Absent from the listing
    Recommended temperatures
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    Drying advice
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    Finish
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    Amazon reference
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    EAN
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All soldering flux