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White-yellow rosin paste flux in a 100g bottle

Essmetuin XW799 Rosin Paste Flux 100g 3.5oz

SKU CH-RS70-EYQ52 MPN XW799

Lead-free rosin paste flux in a 100g bottle cleans PCB, BGA and SMD joints without residue

  • Lead-free, halogen-free and acid-free composition protects components
  • No-clean formula leaves residue that needs no removal after soldering
  • Fast wetting speed with low smoke improves joint quality and fluidity
  • High surface insulation resistance once residue solidifies for reliable boards
  • Suitable for PCB, BGA, SMD, phone and appliance repair work

Rosin paste flux for electronics repair

This lead-free, halogen-free, acid-free rosin paste flux comes in a 100g bottle. It is formulated for PCB, BGA and SMD soldering tasks. The paste requires no cleaning after use and produces less smoke during application. It suits technicians and hobbyists working on phone boards, instruments and general appliance repair.

For precision board work.

The flux is designed for fine-pitch component soldering, chip tin implantation and drag welding on circuit boards. It is non-conductive and leaves a high surface insulation resistance once solidified. Builders needing flux for large-gauge wire, stained-glass lead came or plumbing sweating should look at a different formulation.

No-clean residue saves a cleaning step

After soldering, the residue remains on the board without affecting electrical insulation. This eliminates the need for solvent cleaning in most repair workflows. Users who require a flux that must be removed for conformal coating adhesion or strict ionic-contamination limits will need a water-soluble or solvent-clean alternative.

How it compares

Measured against everything we stock in Soldering Irons & Stations, at today’s prices. Recalculated every night.

Price $21.99
Cheaper than about 58% of the 802 comparable items (median $25.99).

Specifications

No published specifications for this item yet.

Questions about this item

What type of soldering iron and solder alloy are required to use this XW799 rosin paste flux?

A standard electric soldering iron and lead-free solder wire or paste are needed; the flux is formulated for lead-free, halogen-free, acid-free alloys and works with PCB, BGA, and SMD rework.

Can this 100g flux be used with older leaded solder wire I already have?

It is designed for lead-free alloys; while it will wet leaded solder, the no-clean residue and insulation resistance are optimised for lead-free, halogen-free processes.

How do I confirm the flux is performing correctly after applying it to a joint?

Look for rapid wetting, minimal smoke, a firm shiny fillet, and a clear non-conductive residue that shows high surface insulation resistance once solidified.

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