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A pH figure on the tin

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.

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

Specifications

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

The LABUYI flux listing, bullet by bullet

Five bullets: a 50 g tin with a neutral pH of 7 ± 0.3; less residue, good wetting and little smoke; a semi-solid rosin paste, described by the seller as non-toxic and lead-free, with anti-oxidation effect on the tip; steps to clean, apply and solder; and repairs from phones and motherboards to SMT, LED and BGA work.

LABUYI’s pH

7 ± 0.3. A neutral pH says the paste is not acidic. It is not the same as a flux activity class, which the listing does not give.

LABUYI’s wording

“Non-toxic” and “safe” are LABUYI’s words, with no data sheet or standard named. Handling guidance belongs to the maker’s safety data. The tin in the product photograph carries the ZJ-18 label also seen on the YSHODGU and BOJACK pastes here.

Availability

At the last look-up, the German and French Amazon stores were asking 5 € to 7 €.

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

The Italian and Spanish Amazon catalogues list 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.

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