Viscosity and tack are two important material properties that define a flux. People often “tack” them together as one, thinking they go hand-in-hand. Typically, this is the case, but not always. This blog discusses the differences between these properties.
The different flux and solder paste formulations mean that some products will have different material lifetimes than others. Understanding the lifetimes and following manufacturers recommendations can help to ensure you get the optimum performance from the material.
Indium Corporation is a developer, manufacturer, and global supplier of: specialty solders (including solder paste, preforms, spheres, columns, wire, tubing, ribbon, and foil), fluxes, electrically-conductive adhesives, inorganic compounds (including indium oxide, indium-tin oxide, indium hydroxide, and indium chloride), fusible alloys, indium-containing fabrications of all types, and pure indium (from commercial-grade through high-purity).
Indium Corporation's flux pens utilize a spring-loaded applicator tip to deliver a controlled amount of flux to the work surface. The user friendly pin-point applicator is ideal for touch-up and light assembly work. To apply, simply depress the tip of the flux pen against the work area to start the flow of the applicator tip.
Indium Corporation flux pens come in Pb-free and SnPb, no-clean and water wash.
Our materials enable the manufacture of strong, reliable products that endure the inevitable physical shocks and thermal stresses associated with electronics devices in applications from the Internet of Things (IoT) mobile devices to next-generation - low-energy servers – to automobile electronics.
Indium Corporation provides fluxes for:
Package-on-package and fine-pitch component attach
Indium Corporation manufactures a complete line of TACFlux® which includes no-clean, water-wash, and RMA-based fluxes. Its many uses include: rework and repair of various electronics assemblies and components, SMT component attach (including BGAs and flip-chips), BGA ball-attach, preform soldering, and virtually any application where a flux is required. Cycle times are not critical as TACFlux® may sit for hours with no reflow degradation.
TACFlux® 020B-RC is the newest addition to our popular TACFlux® product line. TACFlux® 020B-RD is a no-clean flux formulated for both SnPb and Pb-free soldering. It is halogen-free and passes SIR in the unreflowed state, which is ideal for rework applications where the flux may not be heated properly.
Indium Corporation offers a full line of competitive, state-of-the-art wave solder fluxes for electronics assembly. We are the first company to introduce halogen-free, Pb-free wave fluxes that perform as well as the more established halogen-containing tin-lead wave fluxes.
All wave solder fluxes are available in 55-gallon (200 liter), 5-gallon, and 1-gallon containers.
Epoxy fluxes are often used in no-clean SMT component attach applications. The solder bumps on wafer level CSP, micro BGA or BGA packages are dipped in epoxy fluxes, or the flux is applied to the substrate via a jetting process. The assembly is then reflowed, and the epoxy flux acts to both clean up the solder joints before reflow, and to reinforce the final joint from the cured polymer.
Package-on-Package (PoP) assembly is most commonly carried out by printing solder paste onto the substrate and placing the logic chip into the paste. The memory package is then either dipped into a specially-designed PoP flux or PoP solder paste, then and placed on top of the logic chip. The whole assembly is then reflowed. No-clean processes are used. PoP flux is typically preferred over PoP solder paste as it is easier to set-up and control the process. PoP solder paste is primarily used when there is component warpage and the solder paste bridges the gap cause by warping boards or substrates. Colored versions of PoP flux are available – upon request – for help with automated inspection of the flux or even visual inspection for process optimization. The colored versions will aid in ensuring there is PoP flux present on the dipped components.