Acid Core Vs Rosin Core Solder – Details, Pros & Cons

Soldering is a popular method of repair for a variety of projects. You can use the solder material to connect two metal wires or pipes by melting it. People choose solder because it creates a strong link between the many components involved. However, deciding which soldering substance to use can be difficult.

Acid Core Solder

Soldering flux is a company that distributes a variety of these types of products. All of the Acid Core Solder products, in addition to being concentrated, are water soluble. Because Acid Core Solder products are water soluble, they produce no acid or harmful fumes. This makes Acid Core Solder products environmentally friendly. Acid core solder is a type of aluminum-based flux that is specifically formulated to be highly corrosive to zinc or tin. When used in soldering, it is designed to prevent oxidation during the soldering process. Acid core solder is especially popular in the electronics industry as it eliminates the need for a separate fluxing agent.

Acid Core Solder


Acid Core Solder (ACS) is an affordable alternative to solid core printed circuit board (PCB) construction. ACS technology uses organic compounds chemical compounds derived from minerals and petroleum to bond solder and pads to the printed circuit board (PCB). Since the compounds used are not water-based, the resulting product is thinner than a traditional board (2.4 mm versus 4 mm), which reduces the weight and thickness of the finished circuit board. The acid core flux’s strength aids in the bond’s strengthening. This type of solder can be used on practically any metal due to the strong acid core flux. If you want to use the same spool of solder on other tasks around the house, or if you’re a professional builder or plumber, acid core flux’s adaptability is advantageous.

Even the toughest oxidations and greases can be dissolved by the acid core flux on your pipes or metal sheets. Acid core flux is used by professional plumbers and contractors because of the strength it provides to the linked components and the longevity of the solder.


Because the acid core is corrosive, some residue remains after the soldering operation. After the joining procedure is completed, the residual flux should be cleaned away to prevent corrosion and weakening of the connection. Once the pipes have cooled enough to touch safely, wipe it away with a moist towel.

As long as the water is hot, it should be sufficient to remove any leftover residue. Water-soluble active chemicals should remain after the soldering process. You can get rid of the residue with a little cleaning, maybe using soap if the residue is stubborn, but waiting for the metal to cool down can be a pain.

Aluminum is the only metal that cannot be soldered with acid core solder. Aluminum is a delicate metal, and the acidic flux’s corrosive nature will burn it and render it useless. You’ll need a more delicate solder for aluminium components, such as rosin core solder.

Rosin Core Solder

Rosin core solder is constructed out of a hollow wire with flux within, similar to acid core solder. Metals encircling the flux are similar to those utilised with acid core solder. The main distinction is that with a rosin core, the flux does not leave the same kind of residue as it does with an acid core. Rosin is obtained from pine tree resin and distilled into the flux that is used to improve the binding between the metals in rosin core solder. The flux is still strong enough to remove any oxides or other greases that may have accumulated in the electric circuit without harming the soldered wires. Because the active components in resin core solders are more substantial and clear away more of the grit and dirt that might get between the two joints being soldered together, certain varieties of resin core solder leave a bit of residue behind. For many customers, however, the corrosive property makes those sorts of rosin core less enticing.

Rosin Core Solder


Rosin core flux is appealing to people who use it to join small electrical wires because it does not leave a residue that needs to be cleaned. Acid core flux would be impossible to clean adequately due to the little wires on a circuit board, therefore it would not be the best choice for a small project.

As with acid core solder, the convenience of employing flux-filled solder vastly surpasses any disadvantages. By using flux in your soldering, you can save time and energy by not having to clean it afterward. For folks who want to finish the project quickly, saving the time and energy required to clean up after soldering is a huge benefit.


Because rosin core solder is non-corrosive, it can only be used on copper or brass components. Because of this limiting aspect, the number of projects in which rosin core flux can be used is limited, and a single spool may be more than enough unless you routinely work with copper and brass components.

When rosin core solder is heated, it has an unbearable odour that can also be hazardous to humans. Since most people are bent over their work and closely inspecting it, the fumes from the heated rosin are inhaled through the nose and mouth. Wearing face protection can help to reduce your exposure to the gases.

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