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Sold by: SRA Soldering Products
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SRA Solder 135 Rosin Paste Soldering Flux For Electronics, No Clean Flux Made for Lead and Lead-Free Solder Circuit Boards and Copper Electrical Wire - Safe Clean Residues with No Goopy Mess (2oz Jar)

4.7 4.7 out of 5 stars 15,760 ratings
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Amazon's Choice in Soldering Flux by SRA Soldering Products

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Rosin Paste

Purchase options and add-ons

  • USA Quality Flux - Achieve the soldering results you desire with SRA 135. Our rosin paste flux is impurity free with superior solder flux paste wetting performance. Rosin flux soldering perfected.
  • No Goop Solder Flux - Semi-solid solder wax consistency gives you superior control over application. Simply dip copper electric wires or apply electronic rosin flux to PCB and watch the solder flow!
  • Electric Solder Flux - Unlike paste flux wax found at the hardware store, SRA 135 acid free electronics soldering flux is the safe and effective choice for electrical and electronic applications.
  • Flux Specifications - 135 is a type RA (Rosen Activated) Flux with an Active Temp. Range of 93 – 315°C / 200 – 600°F. This listing is for one 2oz (56.6g) jar of electrical flux paste.
  • Flux for soldering DIY electronics projects including Car Audio, Stereo & Hifi, Computers, RC Vehicles, Drones / FPV, Musical Instruments, Gaming Consoles, Model Railroad, Arduino / Raspberry Pi, etc.
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Customer ratings by feature

Easy to clean
4.6 4.6
Easy to use
4.6 4.6
Value for money
4.6 4.6

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This product has fewer returns than average compared to similar products.

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From the manufacturer

rosin, flux, 135, paste, sra, solder, soldering, circuit, board, pcb, aoyue, wire, brush
SRA, 135, flux, puck, tools, spatula, brush, aoyue, solder, soldering, station, board, circuit, pcb

flux
Appearance of the Flux

SRA #135 flux is an amber colored paste. The consistency of the flux should not be gooey or hard to puncture. In other words it should be solid but also easy to dip wires and applicators into. If you see crystallization (rosin hardening) at the surface of the flux this is absolutely normal and NOT an indication of expired or tampered with flux.

  • SKU: FLS135

About

SRA #135 is a petrolatum-based soldering flux, containing Rosin and organic acid activator. Unlike many paste fluxes, it contains NO Zinc Chloride or Ammonium Chloride, making it ideal for electrical and electronic repairs. The Rosin also leaves a protective coating over the soldered area that can prevent corrosion.

  • Ideal for electrical and PCB repairs
  • Does not need to be cleaned
  • Contains 2 ounces (56.6 grams) in a jar
  • Type RA (Rosin-Activated) Flux
  • Active Temperature Range: 93 – 315°C / 200 – 600°
  • Dimensions: 2.5″ Dia x 1″ H (64 x 25.5 mm)
  • Weight: 2.5 Oz (70.8g)
  • Made in USA
flux, solder, 135. 80, 99, 312, no-clean, rosin, water soluble, wire, pens, liquid

Adhesives, flux, license, plate, label, surface, dirt
Flux Comparison

Soldering without flux is like trying to put a new registration label onto your license plate without first wiping off the layer of dirt and grime that has accrued on your license plate since last year. The surface needs to be clean so the adhesives on the label can do their job.

Why Use Flux?

because solder cannot bond without it!

In order for solder to do its job, the layer of oxides on the metal surfaces you're soldering must be removed. A good flux, like #135, removes the oxides and sets the stage for soldering. The solder follows the flux, as if the flux were clearing a path for the solder and telling it where it to go. For many soldering applications, using only flux-core solder wire is sufficient. However, there are benefits of adding an externally applied flux such SRA #135, these benefits include:

  • More control over where the solder will travel – Wherever you apply the flux, the solder will flow to.
  • Expedites the soldering process – It takes less heat and time to get the solder to flow where you need it.
  • Results in a stronger connection – The flux allows the solder to bond properly throughout the target area.
  • Protects the solder joint – This rosin paste not have to be cleaned off after soldering and the residue actually provides a protective coating from corrosion.

How it Works

surface, prep, rust, grease, paint, dirt, wire bursh, sandpaper, steel wool, alcohol, isopropyl

tools, applicator, flux, spatula, brushes, acid, toothpicks, flux, paste, dipped, wires

flux, apply, flow, bridges, solder, coating, brush, aoyue

Flux, solder, 135, magnify, tinning, melt, heat, solder, soldering, tools

Prep Surfaces

Prep the surfaces by removing any dirt, rust, grease, paint, and other contaminants with sandpaper, wire brush, steel wool, etc. For many applications, the residues can be removed with just a rag and some isopropyl alcohol. These impurities may prevent solder flow so it is important not to proceed until clean metal is visible.

Choose an Applicator

Various tools can be used as an applicator for the flux including toothpicks, acid brushes and spatulas. Wires and components can simply be dipped as well. One of the benefits of paste flux opposed to liquid is that it will stay put wherever you apply it.

Apply the Flux Paste

Using your applicator of choice, apply the flux to the target areas you are about to solder. The exact amount applied will depend on the job but in general use just enough to cover the area to be soldered in an even coating. Remember that the solder will flow to where the flux is so make sure to apply only where it is needed to prevent solder bridges and mess.

Apply Heat and Solder

Apply heat using a soldering iron or hot air gun to bring to melting temperature and solder. Remove heat and allow to cool. Remove residue with rag if wanted.

Frequently Asked Questions (FAQs)

Is it effective when working to simply dip the solder wire into the flux and solder or is it significantly better to apply to the joint and why? You want to apply the right amount of flux. Too little and you won’t get good soldering results. Too much and you run the risk of the solder flowing where you don’t want it to, since solder follows flux. You want to apply the flux in the manner that will best ensure you lay down the right amount. Usually this means using a tool to apply the flux to the area being soldered and not dipping the part into the #135. SRA #135 is not runny, and if you dip the part into the flux, you might not get enough flux on it. That being said, I am sure there are people who do dip their part into the #135 flux and get good results.

Is it advisable to heat up the flux with a heat gun if it is too hard/solid? You would want to do this very carefully since you don’t want the ingredients in the flux to separate. Quick, intense heat could cause the flux to separate into disparate ingredients. While this is not too likely, it can happen.

If the rosin flux becomes dry is there anything you can do to return it to more of a paste? You would want to gently heat it until it softens up, but you need to be careful not to heat it up too quickly or at too high of a temperature.

Does dipping your soldering iron directly into the flux help keep the tip clean, are there any benefits? Not a great idea. It wouldn’t be good for the solder iron because if you get too much rosin on a solder iron, it can be hard to clean off. Also, it can cause the flux to separate. Better to put the flux on the part that you are soldering, and to then apply the solder wire and solder iron to the area where the flux is. Of course, the solder iron will usually contact the flux, but you don’t want to 'bathe' the soldering iron inside the flux by sticking it in the flux jar.

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SRA

SRA Solder 135 Rosin Paste Soldering Flux For Electronics, No Clean Flux Made for Lead and Lead-Free Solder Circuit Boards and Copper Electrical Wire - Safe Clean Residues with No Goopy Mess (2oz Jar)


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Product Description

This petroleum/rosin contains No Zinc chloride or ammonium chloride, making it a better choice for electronic repairs. Rosin leaves a protective coating over soldered area Once job is finished

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SRA Solder 135 Rosin Paste Soldering Flux For Electronics, No Clean Flux Made for Lead and Lead-Free Solder Circuit Boards and Copper Electrical Wire - Safe Clean Residues with No Goopy Mess (2oz Jar)
SRA Soldering Products SRA Solder 135 Rosin Paste Soldering Flux For Electronics, No Clean Flux Made for Lead and Lead-Free Solder Circuit Boards and Copper Electrical Wire - Safe Clean Residues with No Goopy Mess (2oz Jar)
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Price-23% $8.49
List:$10.99
$15.99-30% $6.99
List:$9.99
$13.99$6.99$7.99
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Wednesday, Apr 3
Customer Ratings
Easy to use
4.6
4.7
4.6
4.0
4.2
4.7
Value for money
4.6
4.6
4.5
4.5
3.9
4.3
Easy to clean
4.6
4.4
4.0
4.1
4.6
Sold By
SRA Soldering Products
ZHUOBAO
SZPLD
SRA Soldering Products
BOJACK ELECTRON
Sell-U Latam

Customer reviews

4.7 out of 5 stars
4.7 out of 5
15,760 global ratings

Customers say

Customers like the ease of cleaning, quality, ease of use, value, and performance of the flux. For example, they mention it's easy to work with, provides a solid solder, and is good value for money. That said, they say it works great on general soldering.

AI-generated from the text of customer reviews

355 customers mention334 positive21 negative

Customers are satisfied with the performance of the flux for electronics. They mention that it works well on general soldering, and does the job intended with ease. Some say that it's very effective at wetting tin-lead solder, and works well for cold-soldering. Overall, most are happy with the product's performance and recommend it to others.

"Is as advertised. Works great on our electronics. Shipped quick." Read more

"works really well. makes soldering breeze-easy.would recommend," Read more

"If you solder, you need this flux. It works great on soldering...." Read more

"...product for my projects I use it to solder LED to wire systems and it works well" Read more

292 customers mention287 positive5 negative

Customers are satisfied with the quality of the solder. They mention that it helps make strong solder joints, and is easy to apply. Customers also say that the small size of the product is perfect for their applications.

"...I really like this stuff and it's made in the U.S. It cleans well and solder flows easily...." Read more

"...the solder to work its way into the piece you're soldering, providing a solid solder...." Read more

"Fast shipping ! Great seller ! Sold paste that's made in USA. Good stuff. Will buy again" Read more

"...I did enjoy how well it stays put when it dries though. Good stuff." Read more

141 customers mention110 positive31 negative

Customers find the product easy to use. They say it's very easy to work with the paste flux and the small size of the solder. They also say it helps distribute heat and apply solder smoothly. Customers say it makes precision soldering easy and is cheap and simple to use for small projects.

"...like this stuff and it's made in the U.S. It cleans well and solder flows easily. This is the only flux that I am going to buy going forward...." Read more

"works really well. makes soldering breeze-easy.would recommend," Read more

"...This layer creates an environment where solder flows freely onto the object and makes soldering much easier, even down to the individual component..." Read more

"I found it to be a little hard. Have to warm it up before I can load up my acid brush in it. Kind of annoying." Read more

104 customers mention99 positive5 negative

Customers like the flux. They mention that it stays a solid paste at room temperature, and makes soldering a breeze. Some say that it works wonderfully and is easily cleaned with isopropyl alcohol.

"This product is an easy to use soldering aid that creates a layer of flux on the item to be soldered...." Read more

"good electronic flux..seems to smoke much more than the old kester rosini recommend" Read more

"...Easy to apply using anything from a butter knife to a toothpick! Flows beautifully and solder flows just as well...." Read more

"...The above description is from the manufacturers website. The flux works good and makes soldering a breeze...." Read more

97 customers mention88 positive9 negative

Customers find the value of the rosin flux to be great. They say it's a good investment and makes soldering twice as fast. Some say the product is cheap, easy to use, and easy to clean up. Overall, most are satisfied with the value and quality of the product.

"...Well worth the money." Read more

"Works great! A little expensive but worth it." Read more

"...Seems to be a solid product and it was inexpensive. Works just as good as any other ive used in the past." Read more

"Great value and was easy to use for quality Flux." Read more

79 customers mention70 positive9 negative

Customers find the cleaning process of the flux to be easy. They mention that it cleans up quite easily with even the mildest flux remover, and is good for cleaning the soldering iron tips from contaminates and oxidation. It also does the job of cleaning contacts before solder. Customers also say that the flux is good at making the solders flow right into the wires, and that it leaves no residue.

"...I really like this stuff and it's made in the U.S. It cleans well and solder flows easily...." Read more

"...It's easy to clean up as well." Read more

"...I use this type flux because, once soldered, there is no clean up required as with traditional flux." Read more

"It's good for cleaning the soldering iron tips from contaminates and oxidation. Use as directed." Read more

42 customers mention42 positive0 negative

Customers find the product versatile and useful for their electronics projects. They say it's great for soldering, electrical work, and automotive needs. Customers also say it does good for cleaning.

"This is very good product for my projects I use it to solder LED to wire systems and it works well" Read more

"Perfect for what u use it for" Read more

"Great product for what I need. No worries no trouble's. Take the leap believe you'll land with ease" Read more

"...easy to use,easy to clean up,spread easy and evenly.perfect for electronics...." Read more

26 customers mention10 positive16 negative

Customers are mixed about the water resistance of the flux. Some mention that it is petrolatum-based, which means it will not dry out. However, others say that it arrived dry and hard, making it hard to apply to conductors.

"...My advice is to put it in a Ziplock bag when not in use otherwise it will dry up and be harder to apply especially on wiring...." Read more

"Tends to leave a difficult to clean residue, but provides superior wetting & adhesion in cold-soldering . Very thick...." Read more

"...need to use a hot air station with a lot of heat, this stuff burns out rather quickly for chips that require a lot of heat and isn't tacky enough to..." Read more

"The flux paste was very dry and hard to apply on wires/contacts." Read more

I've come to really like this flux.
5 Stars
I've come to really like this flux.
Cleans easily, keep chips where you place them, diluted with 99% iso alcohol it works well in syringe and is non conductive from my experience.
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Top reviews from the United States

Reviewed in the United States on September 12, 2023
Color: Rosin PasteVerified Purchase
6 people found this helpful
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Reviewed in the United States on February 21, 2024
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Reviewed in the United States on March 24, 2024
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Reviewed in the United States on November 10, 2023
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Top reviews from other countries

Roberto Cuesta
5.0 out of 5 stars Excelente
Reviewed in Mexico on November 15, 2023
Color: Rosin PasteVerified Purchase
Shawn Ettinger
5.0 out of 5 stars The SRA Soldering Products Rosin Paste Flux #135 in a 2-Ounce Jar is a soldering essential
Reviewed in Canada on November 1, 2023
Color: Rosin PasteVerified Purchase
One person found this helpful
Report
Dimitry
5.0 out of 5 stars Superb quality but best used with a syringe
Reviewed in the United Kingdom on March 21, 2021
Color: Rosin PasteVerified Purchase
Amazon Customer
1.0 out of 5 stars Not good
Reviewed in India on July 2, 2019
Color: Rosin PasteVerified Purchase
Steve
5.0 out of 5 stars As expected
Reviewed in Australia on January 4, 2024
Color: Rosin PasteVerified Purchase