--- product_id: 11971074 title: "83-1000-0186 Mildly Activated Rosin Liquid Flux Pen for Lead-Bearing and Lead Free Alloy, 0.33 fl. oz." brand: "kester" price: "25141CFA" currency: XOF in_stock: true reviews_count: 8 url: https://www.desertcart.sn/products/11971074-83-1000-0186-mildly-activated-rosin-liquid-flux-pen-lead store_origin: SN region: Senegal --- # High thermal stability ORH1 J-STD-004 classification pH neutral chemistry 83-1000-0186 Mildly Activated Rosin Liquid Flux Pen for Lead-Bearing and Lead Free Alloy, 0.33 fl. oz. **Brand:** kester **Price:** 25141CFA **Availability:** ✅ In Stock ## Summary > ⚡ Elevate your solder game with flux that works as hard as you do! ## Quick Answers - **What is this?** 83-1000-0186 Mildly Activated Rosin Liquid Flux Pen for Lead-Bearing and Lead Free Alloy, 0.33 fl. oz. by kester - **How much does it cost?** 25141CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/11971074-83-1000-0186-mildly-activated-rosin-liquid-flux-pen-lead) ## Best For - kester enthusiasts ## Why This Product - Trusted kester brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Residue You Can Trust:** Non-corrosive, non-conductive, moisture and fungus resistant—leave it on without worry. - • **Seamless Compatibility:** Chemically compatible with most solder masks and board laminates for versatile application. - • **Optimized for Professional Use:** Classified ORH1 per J-STD-004, meeting rigorous industry standards for quality and safety. - • **Thermal Resilience Under Pressure:** Maintains performance at high preheat temps—perfect for multi-layer assemblies demanding reliability. - • **Precision Flux for Critical Soldering:** Engineered for both leaded and lead-free alloys, ensuring flawless rework on complex circuit boards. ## Overview The Kester 83-1000-0186 Mildly Activated Rosin Liquid Flux Pen delivers high-activity fluxing for both leaded and lead-free soldering. It offers exceptional thermal stability for multi-layer circuit boards, leaves non-corrosive and non-conductive residues, and is pH neutral and ORH1 certified per J-STD-004. Designed for critical applications, it ensures reliable, clean solder joints with moisture and fungus-resistant residue, compatible with most solder masks and laminates. ## Description Kester 186 Flux-Pen is specifically designed for leaded and lead-free rework of conventional and surface mount circuit board assemblies. 186 under MIL-F-14256, was QPL approved as Type RMA. Although the fluxing ability approaches that of Type RA flux, residues after soldering are non-corrosive and non-conductive. 186 has been developed for use in critical applications where difficult assemblies are to be soldered, but process requirements stipulate use of Type RMA flux. 186 possesses high thermal stability for soldering multi-layer assemblies which require higher temperatures. Exposure to high preheat temperatures does not degrade solubility of the residue in normal cleaning solvents. There is no surface insulation resistance degradation caused by the flux residue. The use of a minimum of ionic activating agents and the inactive nature of the residue permits leaving the residue on circuit board assemblies for many applications. The flux residue is also moisture and fungus resistant ## Features - High activity - Chemically compatible with most solder masks and board laminates - pH Neutral Chemistry - Classified as ORH1 per J-STD-004 ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B005T8OR4I | | Best Sellers Rank | #55,404 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #58 in Soldering Flux #205 in Soldering Parts & Accessories #925 in Welding Equipment & Accessories | | Date First Available | April 19, 2011 | | Item Model Number | 83-1000-0186 | | Item Weight | 0.81 ounces | | Manufacturer | NTE Electronics, Inc. | | National Stock Number | 3439-01-510-2558 | | Package Dimensions | 5.5 x 0.5 x 0.5 inches | ## Images ![83-1000-0186 Mildly Activated Rosin Liquid Flux Pen for Lead-Bearing and Lead Free Alloy, 0.33 fl. oz. - Image 1](https://m.media-amazon.com/images/I/51+ryQAbzsL.jpg) ## Available Options This product comes in different **Color, Size** options. ## Questions & Answers **Q: This is listed as one pack; how many pens come in the pack?** A: One pen **Q: What does the applicator tip look like? Does it drip out if you apply pressure drop by drop like super glue or is it something else?** A: Works like a felt tip marker. **Q: Hello is this the same flux as kester 186 rosin soldering flux 2oz bottle, rma no clean lead free and can i get it in a case like in your pics** A: Yes it is just in a pen instead of a bottle. We sell them per pen not in case quantities. The picture is per piece. **Q: Does this solder contain lead ?** A: This isn't solder. It is soldering Flux. It's an alcohol based liquid that you apply before soldering an electrical connection . ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good quality RMA flux in a convenient pen *by on Reviewed in the United States August 17, 2020* Good reliable flux pen. Takes a few tries to first prime the pen when brand new but after that it flows fine. Just paint the flux on where you need it.Kester 186 is a good RMA flux. It's a bit sticky, as most rosin base fluxes, so I like to clean it with a bit of flux cleaner after I'm done. Technically you can leave it on as it is non-conductive and non-corrosive.Kester 186 (RMA) and Kester 951 (No Clean) are my go to liquid fluxes for both lead and non-lead solder work. Great for soldering and desoldring.Don't cheap out on solder, flux, and soldering iron and you'll have no problem soldering. ### ⭐⭐⭐⭐⭐ Love this stuff, works great *by on Reviewed in the United States March 7, 2021* This is my go-to flux, especially for tight spots, small items, and keeping in my portable solder station. It makes the solder flow and isn't a globby mess like paste flux. And you can kinda pump the tip if you need to soak a bigger tumble of wires. I love this stuff- Kester makes excellent products. ### ⭐⭐⭐⭐⭐ Excellent flux for all electronics *by on Reviewed in the United States April 13, 2023* Kester RMA is excellent flux. Yes, it's sticky and leaves residue, but the residue is self passivating. That means that you do not need to clean it off. In fact, you will have less trouble, less leakage, less corrosion if you just leave it in place. I had the opportunity to work with one of the top experts in solder when I worked for Bill & Dave's Excellent Company. There is NO solder joint better than a tin-lead eutectic fluxed with Kester RMA. Everything else is a step down in quality. ## Frequently Bought Together - Kester 83-1000-0186 Mildly Activated Rosin Liquid Flux Pen for Lead-Bearing and Lead Free Alloy, 0.33 fl. oz. - Thermaltronics TMT-TC-2 Tip Tinner (20g) in 0.8oz Container - 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.sn/products/11971074-83-1000-0186-mildly-activated-rosin-liquid-flux-pen-lead](https://www.desertcart.sn/products/11971074-83-1000-0186-mildly-activated-rosin-liquid-flux-pen-lead) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-08-17*