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Rosin Soldering Flux Paste 50G

4.6 4.6 out of 5 stars 2,857 ratings
$5.99
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Purchase options and add-ons

  • Improves solder flow for accurate and controlled soldering
  • Facilitates the soldering process, making it faster and more efficient
  • Creates strong mechanical and electrical bonds for long-lasting connections
  • Prevents corrosion with its protective coating over the solder joint
  • Conveniently packaged with over 1oz net weight for easy storage and handling during soldering
› See more product details

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Customer reviews

4.6 out of 5 stars
2,857 global ratings

Customers say

Customers like the quality, value, and ease of use of the product. They mention it works well for soldering new components to PCBs, is a high-quality product, and provides good flow. Some also like the ease of cleaning, solder joints, and speed of shipping.

AI-generated from the text of customer reviews

Select to learn more
Works wellQualityFlowValue for moneyEase of useEase of cleaningSolder jointsSpeed of shipping
124 customers mention "Works well"105 positive19 negative

Customers like the product. They mention it's easy to use and works well for soldering new components to PCBs. Some say it looks and works as described.

"Works as it should. I had to transfer some wire fittings on my tractor to a replacement component and was easily soldered into place...." Read more

"It works as intended for solid connections when soldering" Read more

"Works great for solderingm" Read more

"I bought this for my jewelry / soldering projects. It works well for me." Read more

53 customers mention "Quality"53 positive0 negative

Customers are satisfied with the quality of the product. They mention it's a high-quality product and the solder iron tip is clean and in good shape.

"Case is not reliable to stay on, so use caution when storing. Excellent product - performed just as well or better than expected...." Read more

"Good product but takes forever to get" Read more

"Good quality" Read more

"Good quality, not dried out or crystallized. Best price on Amazon for the class of material, but still retains high quality." Read more

32 customers mention "Flow"25 positive7 negative

Customers like the flow of the product. They say it's a good flux and helps the material flow nicely. Some customers also mention that it works like magic.

"...away, your work will look so good and professional your solder will flow so nicely on whatever you are soldering, this is the good stuff." Read more

"...However, it does seem to be a very good flux for those occasions where you don't want a really aggressive flux. I would buy it again if needed." Read more

"...Wire to wire,plugs,connecters,etc. The solder flows easily,making a much better connection...." Read more

"Rosin Soldering Flux works like magic. It guides solder flow going to and staying at location where it needs the most." Read more

31 customers mention "Value for money"31 positive0 negative

Customers appreciate the value for money of the flux. They mention it's pretty good and cheap.

"...No complaints and priced perfectly" Read more

"...I still have plenty left, and this jar was cheap enough that having the excess wasn't a problem and just means I'll be happy to be ready to do more..." Read more

"Products received were as expected and the purchase was a good value...." Read more

"...going to solder.. dont do it without some sort of Flux, and the price was great and was delivered on time.." Read more

27 customers mention "Ease of use"21 positive6 negative

Customers find the product easy to use. They mention it makes soldering easy, has a handy container, and makes fast and accurate work of installing their stereo.

"I haven't used flux until now, but this made my soldering MUCH easier than without it...." Read more

"It melted quick and easy and made connections look like I knew what I was doing." Read more

"Works as described. Made fast and accurate work of installing my stereo...." Read more

"...I’ve tried without flux and it’s very difficult" Read more

12 customers mention "Ease of cleaning"9 positive3 negative

Customers like the ease of cleaning the product. They mention it doesn't smell like rosin, doesn't clean contacts like rosin, and helps keep joints clean.

"...It really helped clean up the contacts from the old solder so that the new batteries could sit in properly and snugly...." Read more

"...I use it sparingly and there is no need for cleaning after use. I use a toothpick or sharp probe to apply just a small amount on the components...." Read more

"...Incorrect flux must be thoroughly cleaned, and the chance of missing some or forgetting where it was used is not worth the risk...." Read more

"...But on the other hand , it doesn't drip either. And it's a lot easier to clean up." Read more

9 customers mention "Solder joints"9 positive0 negative

Customers like the solder joints. They mention it makes their solder joints much better, makes their soldering easy, and well-glued. It penetrates wire strands for a solid connection.

"...Used it on a circuit board to replace two resistors and got good solder joints." Read more

"...My solder joints are clean and strong." Read more

"this really made my solder joints much better. The solder was supposed to have flux pre-loaded but never sufficient. Thank youl" Read more

"Helps solder flow and penetrate wire strands for a solid connection. Works as expected." Read more

8 customers mention "Speed of shipping"8 positive0 negative

Customers are satisfied with the speed of shipping. They mention the product works as described and makes fast, accurate work of installing it.

"Works as described. Made fast and accurate work of installing my stereo...." Read more

"Good quality and fast shipping" Read more

"Works great. Soldering smooth as butter. Fast shipping. A+" Read more

"good product, quick ship" Read more

Not a deal-breaker but...
3 out of 5 stars
Not a deal-breaker but...
The cap wasn't properly closed on the container, and a good bit of the product had seeped out of the package when I received it and was in the box on the other packaged items. Amazon was very good about taking care of the issue, but this could have been avoided by shrink-wrapping the container.I'm giving 3 stars because Amazon took care of the product replacement for me. I haven't used the flux yet but looks to be the same as the last container I had.As some other reviewers mentioned, the package is different and from a different manufacturer.
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Top reviews from the United States

leila banner
5.0 out of 5 stars Works well
Reviewed in the United States on June 28, 2024
Item Package Quantity: 1Verified Purchase
Works as it should. I had to transfer some wire fittings on my tractor to a replacement component and was easily soldered into place. I’ve tried without flux and it’s very difficult
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SHENRY
5.0 out of 5 stars Priced Right
Reviewed in the United States on June 15, 2024
Item Package Quantity: 1Verified Purchase
Case is not reliable to stay on, so use caution when storing. Excellent product - performed just as well or better than expected. No complaints and priced perfectly
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michael
4.0 out of 5 stars Works as intended
Reviewed in the United States on July 12, 2023
Item Package Quantity: 1Verified Purchase
It works as intended for solid connections when soldering
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Jordan
5.0 out of 5 stars Dense consistency, quality seems good.
Reviewed in the United States on January 30, 2018
Item Package Quantity: 1Verified Purchase
Rosin Soldering Flux Paste 50G arrived quickly from CMT and the paste was of very thick consistency. It arrived in an opaque white container instead of the translucent package in the photo. Color of the flux is darker than what appears in the photo, but it could be due to the different opaque container and photo lighting. One reviewer claimed it wasn't actual rosin and I disagree, but maybe they've updated the product. The seller followed up well after I received the product and expressed sincere interest in my satisfaction. Based on this ambitious behavior I would not be surprised if they are attentive to feedback.

Before knowing better, I've used water based flux on some electronic projects. DON'T DO IT! Unless maybe you're in a true pinch and can guarantee returning to rework the job, but, even still, it's a bad idea. Incorrect flux must be thoroughly cleaned, and the chance of missing some or forgetting where it was used is not worth the risk. The cost of rework is threefold and doesn't include the mental anguish of doubting integrity. Do it right and get the right stuff.

For years I've counted on the flux built into rosin-core solder, but, as my skillset improves and scope of work widens, the need has overcome the "want". Additional solder is a Godsend with terminal connections, rework, salvaging components, and conserving solder when running the iron for multiple connections. The flux, among its other functions, allows heat to flow and solder follows suite. Heat flow is especially useful when soldering small terminals with an iron instead of flame. Without flux (dry) the iron needs to be in contact for a much longer time; the heat transfer is slower than the dissipation; you end up melting wire insulation and taking an eternity to solder connections. For rework and salvage, faster and more direct heat transfer helps to get in and out without burning up the component you are pulling as well as the surrounding components; this is also good for virgin work, but rosin-core solder usually does the job. However for tasks that require leaving an iron on between multiple connections, the solder sits on the tip between tasks and the flux eventually burns off. Later, when you're ready for the iron again, rather than cleaning off the tip and reapplying solder, you can apply some rosin flux directly to the connection and simply use the solder that is already on the tip.

I used this flux immediately for a 1/0 battery terminal lug and time will tell how well it holds up, but I am confident it will protect protect it well. If something changes, then I will update this review.
47 people found this helpful
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Kay B
5.0 out of 5 stars Used on video game electronics, worked great!
Reviewed in the United States on December 2, 2023
Item Package Quantity: 1Verified Purchase
I bought this so that I could replace the internal batteries in a few GameBoy Advanced Pokémon games. It really helped clean up the contacts from the old solder so that the new batteries could sit in properly and snugly. I still have plenty left, and this jar was cheap enough that having the excess wasn't a problem and just means I'll be happy to be ready to do more with it in the future.
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Amazon Customer
5.0 out of 5 stars Soldering Flux
Reviewed in the United States on August 3, 2024
Item Package Quantity: 2Verified Purchase
Thanks
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Tracie
3.0 out of 5 stars Hmm.
Reviewed in the United States on May 28, 2024
Item Package Quantity: 1Verified Purchase
Tried this item and it works but not the best.
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Amy’s
5.0 out of 5 stars Works as advertised
Reviewed in the United States on July 14, 2024
Item Package Quantity: 1Verified Purchase
Title says all
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