![]() Rosin core solder usually causes light smoke and smells sweet. When burning solder to see what its core is it is important to pay attention to the smell. However, since this is not a guaranteed test, there is another thing that can help differentiate the two. Otherwise, the solder is most likely acid core which can be damaging for electronics. If burning the solder leaves a greasy stain on the paper, then it is rosin core. First, you want to burn the solder on a piece of paper so that you can see what kind of stain it makes. When doing the burn test, there are two things to look out for. How to Tell If Solder Is Rosin Core or Acid Coreīesides the difference in thickness, solder types can be determined by burning a small piece. If the acid core solder, which is meant for plumbing, is used on a circuit board then there is a high chance that the flux residue will damage the board over time. ![]() For this reason, it is important to be certain of which solder you are using. Rosin solder and acid solder are used in two very different areas. Never use acid-core solder on electronics. Generally speaking, rosin core solder is thinner than an acid core and will leave a grease stain and smell sweeter when burned than other solder types, including acid core. However, the packaging might be long gone, so here’s how to tell if solder is rosin core. When it comes to choosing the right solder for electronics, you have to be sure you’re using the correct core. This gives most users reason enough to make the switch to a newer flux that was designed specifically for lead-free processes.“This post contains affiliate links, and I will be compensated if you make a purchase after clicking on my links.” Since lead-free alloys melt at higher temperatures and don't spread as easily as leaded alloys, lead-free compatible fluxes tend to have higher activity and higher heat stability than traditional fluxes. These fluxes represent improvements over traditional fluxes in terms of solderability. ![]() Mike Scimeca created FCT Assembly after the purchase of Fine Line Stencil, Inc., and consists of two major operations: stencil manufacturing and the manufacturing of electronic assembly products such as solder paste, flux and solder bar.įrom the wording of your question, it isn't clear if you are referring to a lead-free flux for a surface mount application (solder paste flux), a wave soldering application (liquid flux) or a hand soldering application (cored wire flux), but in each case, at least to some degree, there is certainly value in utilizing fluxes are known to be lead-free capable.Īlthough some fluxes that had originally had been designed for leaded applications may work acceptablyinlead-free applications, there are many new fluxes on the market today that were designed specifically for lead-free soldering processes. In some cases with no-clean fluxes, a certain minimum reflow time is required to consume their activator so the residue is in fact no-clean. Some "lead free" fluxes just have higher activity levels to compensate for the moredifficult wetting andhigher reflow temperature. Be sure to evaluate the qualities of the residue when you do your testing. When claims such as this are made, I recommend contacting the manufacturer and asking for a FREE sample so you can prove to yourself that their claim is valid. Flux can be formulated to achieve superior results with aspecific lead free alloy. Notall lead free alloys work equally well with all fluxes. The answer is: you will not know unless you try it. Your question must be asking about flux that is marketed as being specially formulated for use with lead free alloy. Does using a lead free solder flux really make a difference? Why not use the same flux we use for leaded soldering in our lead free process?įluxes do not contain metals, such as lead, so all fluxes are lead free.
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