---
product_id: 6991836
title: "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)"
price: "Bs.210"
currency: BOB
in_stock: true
reviews_count: 8
url: https://www.desertcart.bo/products/6991836-sra-solder-135-rosin-paste-soldering-flux-for-electronics-no
store_origin: BO
region: Bolivia
---

# Safe acid-free for electronics Superior wetting performance No-goop semi-solid paste 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)

**Price:** Bs.210
**Availability:** ✅ In Stock

## Summary

> ⚡ Master your solder game with clean, precise flux every time!

## Quick Answers

- **What is this?** 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)
- **How much does it cost?** Bs.210 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/6991836-sra-solder-135-rosin-paste-soldering-flux-for-electronics-no)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Long-Lasting Value:** Generous 2oz jar means you get premium flux that lasts through countless DIY and professional projects.
- • **Wide Thermal Range:** Active from 93°C to 315°C (200°F to 600°F) for versatile soldering across lead and lead-free applications.
- • **Engineered for Electronics:** Acid-free, no zinc or ammonium chloride—perfectly safe for sensitive circuit boards and copper wiring.
- • **Precision Control, Zero Mess:** Semi-solid rosin paste lets you apply flux exactly where needed—no sticky goop, no waste.
- • **Trusted Quality, Proven Results:** Top-rated with 4.7 stars and #2 in soldering flux—join thousands of pros who rely on SRA 135.

## Overview

SRA Solder 135 Rosin Paste Flux is a premium, acid-free soldering aid designed for electronics and electrical wiring. Its semi-solid consistency ensures mess-free application and superior solder flow, compatible with both lead and lead-free solders. With a broad active temperature range and a protective rosin coating, it’s trusted by professionals and hobbyists alike for durable, high-quality solder joints.

## 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

Review: Awesome product great quality and quantity - You get so much for so cheap. Works well and joins the solder perfectly.
Review: Accurate great quantity helps create stronger bonds! - The quantity of this product is amazing for the price. You only need a very small amount to get most jobs done, so this will last me quite a while. This is so easy to use and works fast. It’s not too thick and not too thin rather just right. I used this product to help me clean the ends of a tape measure I sanded for my ham radio tape measure antenna. This enabled me to solder the cable wires to the tape measure with ease. The joint bonded much stronger with the use of this flux. I highly recommend this for both those new to soldering and seasoned soldering experts.

## Features

- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B008ZIV85A |
| Assembled Diameter | 2.5 Inches |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #634 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Soldering Flux |
| Color | Rosin Paste |
| Customer Reviews | 4.7 4.7 out of 5 stars (17,768) |
| Cutting Diameter | 2.5 Inches |
| Date First Available | August 19, 2012 |
| Included Components | jar of flux |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 2 ounces |
| Item model number | FLS135 |
| Manufacturer | SRA Soldering Products |
| Material | lead |
| Part Number | 135 |
| Style | Rosin Flux |

## Images

![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) - Image 1](https://m.media-amazon.com/images/I/51yf-bKX00L.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Will this work for soldering copper speaker wire together**
A: Yes, apply the flux sparingly to the wires. Heat the assembled wiring wIth your soldering iron while touching  the wiring with your solder just until the solder melts and flows into the joint. Don't linger with the iron because you can oxidize the solder and the copper wire with excessive overheating. Insulate the joint with heat shrink tape or electrical tape where necessary.

**Q: Is this specific Rosin Paste Flux #135 non-conductive ?**
A: In case you meant to ask "non-corrosive" the answer is, this should not be corrosive. I haven't seen acid core solder or acid flux in years but it likely still exists. The acid flux is mostly used in plumbing applications, if memory serves me correctly. As someone else mentioned it is still a good idea to clean off the residue of any flux. Neatness counts!

**Q: What is this.  What does it do**
A: One states that it makes soldering easier and another states that it facilitates heat transfer. Both are right. But let ne try to further explain. Solder when heated will sometimes "ball up" when instead you want it to "flow" onto the contact pad on a printed circuit board or "soak" into the wire. It does this properly when there is the right amount of heat between the iron and intended surface. This is where the flux comes in play as it increases soldering productivity by making the desired soldering reactions take place more quickly. This also protects your insulation and other board components by effectively removing heat from surrounding areas more quickly. Hope this helps.

**Q: Is the flux supposed to be pretty hard? The instructions say to brush it on but it's to hard for a brush to pick anything up.**
A: If you just get a small/medium container/bottle(that seals so it wont dry out/evaporate) you can scoop some of this paste into a small amount of Isopropyl Alcohol(91% and up, 99% is best less water) let it sit for a day to dissolve, You can also use heat to make the mixing processes faster but better to let it sit and dissolve on its own and let it do its thing and boom liquid flux. You can use with a brush or some kind of squirt bottle to dispense It, I use old vape juice bottles. hope that this helps. It works really well for me! Good Luck!

## Customer Reviews

### ⭐⭐⭐⭐⭐ Awesome product great quality and quantity
*by B***R on December 31, 2025*

You get so much for so cheap. Works well and joins the solder perfectly.

### ⭐⭐⭐⭐⭐ Accurate great quantity helps create stronger bonds!
*by K***N on January 30, 2026*

The quantity of this product is amazing for the price. You only need a very small amount to get most jobs done, so this will last me quite a while. This is so easy to use and works fast. It’s not too thick and not too thin rather just right. I used this product to help me clean the ends of a tape measure I sanded for my ham radio tape measure antenna. This enabled me to solder the cable wires to the tape measure with ease. The joint bonded much stronger with the use of this flux. I highly recommend this for both those new to soldering and seasoned soldering experts.

### ⭐⭐⭐⭐⭐ Very good and long lasting flux
*by E***L on January 7, 2026*

I bought this to build drones... It may just last forever due to a micro dose being more than plenty for wires 12-30 AWG. Its sticky, perfect for joints and pads and doesn't leave nasty smells.

## Frequently Bought Together

- 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)
- MAIYUM 63-37 Tin Lead Rosin Core Solder Wire for Electrical Soldering (0.8mm 50g)
- Lesnow solder wick braid 10ft Length Desoldering Wick Braid Remover Tool Solder Sucker 1 piece No-Clean soldering Wick Wire Roll and Disassemble Electrical Components

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.bo/products/6991836-sra-solder-135-rosin-paste-soldering-flux-for-electronics-no](https://www.desertcart.bo/products/6991836-sra-solder-135-rosin-paste-soldering-flux-for-electronics-no)

---

*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-02-23*