Hoe verwijder je veilig flux uit elektronica?
How to Safely Remove Flux from Electronics with Isopropyl Alcohol
When cleaning electronics after soldering, removing flux is essential to maintain optimal performance and prevent potential long-term problems. Isopropyl alcohol (IPA), especially at 99.9% purity, is widely considered one of the best solvents for cleaning electronics due to its strong dissolving power, rapid evaporation, and minimal residue.
Why use isopropyl alcohol to clean electronics?
Isopropyl alcohol is very effective for cleaning electronics because it can dissolve common flux residues left behind after soldering, including rosin-based and no-clean flux. Its volatility allows it to evaporate quickly without leaving moisture on sensitive components. Compared to other solvents, it is safer for most electronic materials and components. It is often available as rubbing alcohol and is a standard product in electronics maintenance kits.
Step-by-step guide to removing flux with isopropyl alcohol
Choose the right concentration: For effective flux removal, use isopropyl alcohol with a concentration of 90% or higher (ideally 99.9%). Lower concentrations may contain water or oils that leave a residue.
Prepare your tools: Use a soft brush (such as a toothbrush or acid brush) and lint-free wipes or paper towels. A spray bottle can help apply the isopropyl alcohol evenly. Ensure good ventilation and wear gloves for safety.
Apply the alcohol: Spray or dip the brush in isopropyl alcohol and gently clean the soldered joints and surrounding areas. Avoid applying too much pressure to protect delicate components like potentiometers.
Repeat as needed: Flux may require several cleaning cycles. Wipe away quickly dissolving flux with a lint-free cloth to prevent buildup.
Optional ridge cleaner fluid: For stubborn flux or dried-on residue, a specialized ridge cleaner fluid designed for electronics can be used along with isopropyl alcohol to enhance cleaning power.
Dry thoroughly: Let the circuit board air dry completely before turning it on. The rapid evaporation of isopropyl alcohol minimizes drying time.
Additional tips for cleaning electronics
Use caution when cleaning around sensitive parts such as optical sensors and switches.
Some fluxes marked "no-clean" do not necessarily need to be removed unless visual cleanliness is necessary.
Avoid using alcohol near polystyrene parts, as they may degrade with prolonged exposure.
Always store isopropyl alcohol in a tightly closed container to maintain purity and prevent contamination.
Why Rubbing Alcohol and Ethyl Alcohol are Less Recommended
While rubbing alcohol may contain additives and lower IPA concentrations, it can leave a residue that reduces the cleaning quality of electronics. Similarly, 96% ethyl alcohol , while a useful cleaning agent, typically evaporates more slowly and may contain more impurities than high-purity isopropyl alcohol.
In conclusion, using high-purity 99.9% isopropyl alcohol is an industry-recognized , safe, and effective method for removing flux and cleaning electronics. Using this solvent, along with the right tools and techniques, ensures thorough cleaning without damaging delicate components, extending the lifespan and reliability of electronic devices. Not for drinking .
For professional users requiring advanced cleaning solutions, combining isopropyl alcohol with ridge cleaner fluid can tackle even the most stubborn flux residue. Properly cleaning potentiometers and printed circuit boards is a crucial step in maintaining the quality of electronics.
⚠️ Please note:
This post is for informational purposes only. Always follow safety guidelines and professional recommendations when handling chemicals and electronic devices.
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