Best Solder Fluxes of 2025

The Mercury Solder Flux is a convenient 30g tin that offers a clear solution for all your soldering needs. Its compact dimensions of 15 x 40mmØ make it easy to handle and store, allowing you to work efficiently without clutter. The clear colour ensures that you can easily see where you've applied the flux, helping you achieve precise results. As a solder flux, it enhances the flow of solder, ensuring strong, reliable connections in your electronic projects.

The LA-CO Solder Flux is a compact and efficient product, measuring 7.1 centimetres in height, 5.8 centimetres in length, and 5.8 centimetres in width. Weighing just 0.15 kilograms, this solder flux is easy to handle and store, making it perfect for both professionals and DIY enthusiasts. Its convenient size allows you to carry it around without any hassle, ensuring you always have it on hand when you need to make soldering tasks easier and more effective.

The Zocipro Solder Flux is a high-performance solution for precision electronics soldering. Its no-clean formula ensures a low residue, providing you with bright solder joints and making it ideal for reworking BGA, CGA, and CSP packages. The 10ML syringe contains acid-free and halogen-free rosin, which guarantees strong oxidation effects while maintaining good insulation for your electronic components. With its easy-to-use design, you can effortlessly dispense the right amount for various soldering tasks, enhancing your overall soldering experience.

The Switch Electronics Soldering Flux is a high-quality rosin-based flux paste, designed to make your soldering tasks easier and more efficient. Its non-corrosive residue ensures that your electronic components remain safe and free from damage, allowing for a cleaner finish. The compact 40g size is perfect for home or professional use, making it easy to store and transport. This flux paste enhances the soldering process, providing a reliable and effective solution for achieving excellent electrical connections.

The GMHLLES Solder Flux is a versatile solution for all your soldering needs. It comes in a complete package, providing you with two 10ml flux pastes, four needles, and two push rods, making it easy to tackle various welding tasks. Its user-friendly design allows you to effortlessly transfer paste between syringes, minimising waste and enhancing storage efficiency. Crafted from high-quality, acid-free, and lead-free materials, it ensures optimal soldering results while protecting your equipment from damage. Experience excellent electrical and thermal conductivity, which significantly boosts your welding efficiency.

The Laco Soldering Flux is a top-quality product made in the United States, weighing just 0.08kg. With its UK specification, you can trust that it meets high standards for performance. This 60g pack is designed for users who require reliable soldering solutions, ensuring that your connections are secure and effective. The high-quality formulation helps to improve solder flow, making your projects easier and more efficient.

The BEEYUIHF Soldering Flux is a versatile no-clean solder paste designed for various electronic repairs. It operates effectively within a soldering temperature range of 250℃-320℃, helping you reduce heat exposure to components while ensuring strong solder joints. The high purity rosin formulation is lead-free and acid-free, making it safe for both you and your projects. Additionally, its convenient syringe dispenser allows for precise application, making touch-ups and repairs on surface mount assemblies quick and easy.

The Hocklliy Solder Flux offers excellent performance with its high viscosity and no-cleaning features, making it ideal for various welding tasks. You can easily repair BGA, CGA, or CSP packages with confidence. This 10 ml paste is made from acid-free and lead-free materials, ensuring minimal residue and low smoke production for a safer experience. Its unique formula provides strong oxidation effects and insulation for electronic components, guaranteeing the stability and quality of your solder joints.

The BEEYUIHF Soldering Flux is designed for high-density soldering tasks, making your soldering process more efficient. Its no-clean ultra-low residue formula means you won’t need to clean up afterwards, saving you time. The high-activity flux enhances the fluidity of tin, allowing you to achieve clean and precise solder joints with ease. Additionally, this flux operates effectively at a lower temperature, helping to protect sensitive electronic components while improving the overall solidity of your soldering work.

The Clothing Estates Soldering Flux is an excellent choice for soldering with tin-lead alloy. It enhances adhesion for horsehair strings, making them easier to work with. The rosin is a hard, brittle substance with a faint piny odour, melting between 100°C and 120°C, which allows for effective soldering. Additionally, it contains activators that make it nearly as effective as traditional soldering paste, ensuring a smooth and efficient soldering process for your electronics projects.