Best Soldering Flux in 2022

When it comes to soldering, flux is an integral component of the process. Finding the best flux for your soldering needs can be a daunting task, as there are so many different types and brands to choose from. In this blog post, we’ll discuss what types of flux are available and the key factors to consider when selecting the best flux for your project.

First off, there are two main types of flux: rosin-based flux and water-soluble flux. Rosin-based flux is the traditional, lead-free type of flux and it is usually made from a combination of rosin and acids. This type of flux is best for general-purpose soldering and it is relatively easy to find.

On the other hand, water-soluble flux is a newer type of flux that is designed for higher temperatures and is often used for soldering stainless steel and other metals that require higher temperatures for soldering. This type of flux is more difficult to find and is usually more expensive than rosin-based flux.

When selecting the best flux for your project, there are a few key factors to consider. First and foremost, you should consider the temperature of your soldering application. If you’re soldering at high temperatures, water-soluble flux is the best option, while rosin-based flux is best for lower temperature soldering.

You should also consider the type of metal you’ll be soldering. If you’re soldering copper or brass, then either type of flux can work, but if you’re soldering stainless steel or aluminum, then water-soluble flux is the best option.

Finally, you should also consider the brand of flux. Different brands of flux can have different levels of effectiveness, so it’s important to read reviews and do research to determine which brand of flux is best for your particular project.

In conclusion, finding the best flux for your soldering needs can be tricky. It’s important to consider the temperature, type of metal being soldered, and the brand of flux when selecting the best flux for your project. With a bit of research and experimentation, you should be able to find the perfect flux for your soldering needs.

1. 60 ml. / 2 Oz. KESTER 951 No Clean Soldering Solder Liquid Flux Reflow

60 ml. / 2 Oz. KESTER 951 No Clean Soldering Solder Liquid Flux Reflow

Informations:

60 ml. / 2 Oz. No Clean Soldering Solder Liquid Flux Reflow KESTER 951#

Review:

Even though I've been soldering for a long time, I'd never encountered this kind of flux.It enters spaces where ordinary flux cannot. Now that I'm older than 25, I can solder again. I got two bottles, and I'll probably buy more if I run out.

2. Sra Rosin Paste Flux #135 In A 2 oz Jar

Sra Rosin Paste Flux #135 In A 2 oz Jar

Informations:

Made in USA

designed to work with both lead-free and tin/lead alloys

2 ounces are included in a "Hockey puck" Jar.

Does not require cleaning

Active temperature range: 200–600°/93–315°c

Size: 2.5" dia. x 1" h. (64 x 25.5 mm)

The best flux for repairing electronics and electrical systems#

Review:

Wow, there is so much change right now. Prior to purchasing it, I had no idea and thought it was pricey but I needed it. I've abused it mercilessly and barely scratched the surface.Oh, and it's really nice stuff, too. Even though I know I shouldn't breathe it in, at least when it burns, it smells pleasant rather than like nasty chemicals. It makes making solid solder junctions ridiculously easy. Avoid purchasing the substance in a syringe. Simply dab this on with a toothpick or—as I do—the tip of one of those double-ended, blue-handled soldering tools that are available on Amazon.com. Use as much as you like; it will last you forever.Another method is to slowly pour it into or suction it up with your own syringe after melting it with your soldering iron until it is liquid. Syringes in quantity are simple to purchase on eBay or here on Amazon. I haven't done that, but if I can locate a spare, blunt needle, I'd like to. There will be a LOT of fumes, but the flux will re-harden and function perfectly once it has been melted.

3. Oatey Company 30374 1.7 Oz #95 Flux

Oatey Company 30374 1.7 Oz #95 Flux

Informations:

Flux never goes out of style

made with the same high-quality ingredients as No. 5. To pre-tin the copper pipe, however, patented Oatey silver solder powder is added.

excellent for copper with a large diameter

Oatey is a commercial brand.

Mexican imports

Equip

Review:

When soldering plumbing, especially if you're a beginner, you want this. This contains silver particles in the flux, which can help fill in minor gaps if your soldering isn't flawless. This has been used multiple times with no leaks or problems. My only complaint is that the material needs some warming up because it is a touch stiff out of the can. Due to its density, it can be challenging to apply with a brush, but I think this minor trade-off is worthwhile.

4. Harris SSWF1 Stay Silv Brazing Flux, 1 lb. Jar, White

Harris SSWF1 Stay Silv Brazing Flux, 1 lb. Jar, White

Informations:

Active temperature 1050–1600°F

Made in USA

1lb Jar#

Review:

I've tried four fluxes for silver brazing, this being the fourth. Only this one was successful. Excellent for monitoring temperatures because it doesn't burn out and stays on.

5. Delcast Rosin Soldering Flux Paste 50G

Delcast Rosin Soldering Flux Paste 50G

Informations:

Flux makes solder flow more easily, allowing for more precise and controlled soldering. Solder will flow wherever flux is applied.

by creating a protective covering over the solder junction, prevents corrosion.

makes the soldering process more efficient and quick, requiring less time to get the solder to flow where you need it.

enables the creation of durable, strong mechanical and electrical connections by the solder

Size: 1 oz.#

Review:

Not confident in Flux's quality? Who knows if that's good or harmful, but I tried it on some wire solders and I have to admit that it significantly increased the solder's ability to bear loads. I was impressed. Don't solder without using some form of flux, plus the price was excellent and the delivery was prompt.

6. Kester 83-1000-0186 Mildly Activated Rosin Liquid Flux Pen for Lead-Bearing and Lead Free Alloy, 0.33 fl. oz.

Kester 83-1000-0186 Mildly Activated Rosin Liquid Flux Pen for Lead-Bearing and Lead Free Alloy, 0.33 fl. oz.

Informations:

Chemistry at pH Neutral

according to J-STD-004 classification ORH1

intense activity

compatible chemically with the majority of solder masks and board laminates#

Review:

admired the flow I've had liquid flux on my shopping list for a while, and I knew Kester was a reliable brand. Cleans up really well and transfers heat well. would repurchase.

7. MG Chemicals Liquid Rosin Flux, for Leaded and Lead Free Solder, 125 ml Bottle

MG Chemicals Liquid Rosin Flux, for Leaded and Lead Free Solder, 125 ml Bottle

Informations:

For lead-free and tin-lead solder

Non-hygroscopic

Non-corrosive

Quick wetting

RoHS compliant#

Review:

Since my goal is SMD re-flow, I was hesitant to use liquid flux because I had never used it before. However, so far, it seems to be working nicely.I spilled some of the liquid around the needle tip bottle and had to wash it with detergent and hot water to get rid of the stickiness. The liquid is very sticky if you manage to get any on your hands or working area where you didn't want to use it.The good: I purchased this flux since it stated that it was "for leaded and lead-free solder." I tested it with both types of solder and found that it functions admirably with both.The bad, but not too awful: When used with lead-free solder at 330 C, it burns and smokes a lot and leaves a brown residue. It burns quickly even with low temperature solder and iron at 210 C.By the way, the dark brown residue is normal for this type of flux and is a result of the substance (COLOPHANE) that it is made of; I was aware that it would be brown, so I won't be complaining.Cleaning: I tested leaving some 99% alcohol on the test board overnight and I was able to clean it with no effort. This was true for surfaces made of both lead-free and leaded solder.I advise having good ventilation if you plan to use this flux at high temperatures.

8. MG Chemicals 8341 No Clean Flux Paste, 10 milliliters Pneumatic Dispenser (Complete with Plunger & Dispensing Tip)

MG Chemicals 8341 No Clean Flux Paste, 10 milliliters Pneumatic Dispenser (Complete with Plunger & Dispensing Tip)

Informations:

Review:

I enjoy this material. I utilize a range of fluxes, like most people. Before this, Chipquik SMD291 was my go-to. Although they are both wonderful, there isn't much difference between them, but I prefer the MG Chemicals version. makes it much simpler to remove solder blobs, bridges, etc.However, I advise transferring the contents of this tube into a smaller (3-5cc) syringe. This makes application simpler because you can exert more pressure than in the huge syringe this comes in with less effort. My favourite technique involves joining the syringe tips with a small piece of silicone tube (0.5"). No mess and little air entrapment!Overall, it is strongly advised.
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Matt Grabowsky

My name is Matt Grabowsky and for over two decades I have been observing technological and social trends, talking about them and explaining them in an accessible way.