Genuine Kester 186-18 RMA Soldering Flux 18% Solids Low Residue - 30ml (1oz.) For Sale

📌 Seller's Note: We buy Genuine Kester 186-18 by the industrial gallon for our own automated PCB fabrication and high-end electronics repair shop because it’s the best flux on the planet. Since a gallon is way too much for a single bench, we precision-package the fresh surplus into these convenient 30ml needle-tip bottles so hobbyists and technicians can get the real deal without paying industrial prices. No fillers, no homebrew formulas—just 100% factory Kester.

Genuine Kester 186-18 RMA Flux

30ml (1oz) Needle-Tip Dispenser | 18% Solids | Low Residue Formula

⚠️ STOP BUYING "PINE TREE JUICE"

There is a massive difference between "rosin dissolved in alcohol" and Genuine Kester 186-18. Many sellers on are mixing cheap pine rosin with drugstore alcohol in their garage. That "DIY" mix smokes heavily, burns off instantly, and leaves a sticky, carbonized mess without actually cleaning surface oxides. Check their MSDS Sheet. What's that you say... no MSDS? Mmmm....
This listing is the real deal.

Why the "18%" Formula Wins

Technicians specifically hunt for the 186-18 variant over standard 36% flux for its incredible performance:

• ⚡ Half the Residue: Delivers full industrial oxide-cleaning power but leaves 50% less sticky residue behind. Your boards look factory-clean.
• 🔬 Engineered Activators: Proprietary Kester chemicals actively strip away oxidation the instant heat hits the board.
• 🎯 Instant Wetting Action: Drastically lowers surface tension so solder flows smoothly into perfect, shiny fillets.
• 🔥 Thermal Stability: Formulated to withstand sustained high temperatures without burning away or charring.

What is Included

• 1x 30ml (1oz) Bottle filled with factory-fresh Kester 186-18 RMA Flux.
• High-Precision Needle Tip: Stainless steel blunt needle for perfect fluid control—no flooding components.
• Fresh, Active Stock: We cycle our bulk supply continuously in our fabrication shop. Never expired.

⚙️ Perfect For: PCB Rework, Micro-Soldering, Vintage Restoration & Console Repair. Technical Specifications Brand Kester (100% Genuine Factory Bulk) Model / MPN 186-18 Flux Type RMA (Rosin Mildly Activated) Solids Content 18% (Low Residue Variant) Specific Gravity 0.879 +/- 0.005 IPC J-STD-004 Classification ROL0 (Non-corrosive, Non-conductive residue) 🚀 Fast & Free Shipping

We know you need your shop supplies quickly. All orders placed before 2:00 PM CST ship out the same or next business day. Our bottles are tightly sealed, packed, and bagged to ensure zero leaks arrive at your bench.

🤝 Buy with Confidence

No, we're not Kester agents or distributors. We utilize Kester products in our work because we believe Kester has been making the best for a very long time. We stand behind the absolute authenticity of our Kester products - 100%.