Liquid Borax 1 Lt

Liquid Flux Use – A Comprehensive and Practical Guide

Liquid flux is a chemical additive used primarily in soldering processes. It facilitates surface preparation of metals before soldering, ensures good solder adhesion, and improves solder quality.

????️ What is Liquid Flux?

It dissolves the oxide layer on metal surfaces.

It ensures good solder wetting.

It prevents new oxidation that may occur during soldering.

It generally contains organic solvents, resins (rosin), activators, and additives.

???? Applications

1. Electronic Soldering

This is the most common use.

It is used in PCB (printed circuit) soldering processes to clean component pins and pads and to spread the solder evenly.

The application of liquid flux is especially critical in SMT (surface-mount technology) processes.

2. Copper Pipe Soldering (HVAC / Plumbing)

Used for soldering copper pipes in air conditioning and cooling systems.

This type of flux is generally acidic and quickly removes surface oxides.

3. Microelectronics and Fine Soldering

Low-residue fluxes are preferred for precision soldering (e.g., BGA rework).

4. Jewelry and Jewellery

Using flux increases surface wettability when soldering gold, silver, and other precious metals.

???? How to Use Liquid Flux?

Cleaning: The surfaces to be soldered should be cleaned of oil, dust, and old solder residue.

Application:

Flux can be applied with a small brush, dropper, or special syringe.

Apply only to the areas to be soldered (messy application increases the risk of short circuits).

Soldering:

Soldering should be done at the appropriate temperature (usually between 250–350°C).

Cleaning (if necessary):

If no-clean flux is used, cleaning may not be necessary.

If active (RA, RMA) flux is used, the surface should be cleaned with alcohol or flux cleaner after the process.