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Flux & Flux Removers

Peruse Circuit Specialists' lineup of inexpensive solder flux and flux removers (liquid and aerosol). Our no-clean liquid rosin flux has superior fluxing ability — after soldering the rosin residue is non-corrosive, non-conductive, and moisture- and fungus-resistant. 

Circuit Specialists carries aerosol or liquid flux removers which clean all manner of organic rosin fluxes and ionic soils left over after soldering circuits which feature variable valves that allow you to control the rate of flow.

What is Solder Flux? 

Solder flux is a chemical cleaning agent that serves three key purposes in soldering:

  • Flux removes oxidated metals and corrosion from the surfaces you’re soldering
  • Flux coats and prevents surfaces from further oxidation 
  • Flux improves the wetting characteristics of solder

Without soldering flux, you run the risk of creating “cold” solder joints, which occur if oxidation is still present on the surfaces you’re soldering. Unclean, oxidized metal surfaces can also cause solder beads, which can short-circuit and damage surrounding components. 

Today, solder flux comes in a few different forms, including liquid and paste—some solder wires even contain flux cores. Solder flux also comes in various compositions, depending on the application you’re using it for. For example, it’s important to not confuse solder flux for electronics with acid flux types that are used for plumbing. 

Always check that the solder flux you’re purchasing is designed specifically for the project you’re using it for. 

Types of Solder Flux for Electronics

Rosin Flux

Rosin flux is made of natural rosin that’s extracted from the sap or resin of pine trees. Rosin contains the active ingredient abietic acid, which naturally cleans and deoxidizes surfaces. Other acid activators might be added to rosin to improve its cleaning abilities. Because of the varying levels of acidic activators, rosin flux actually comes in three key types:  

Rosin (R) Flux contains no added acid activators and is ideal for relatively clean surfaces and doesn’t leave residue behind.

Rosin Mildly Activated (RMA) Flux is Rosin flux with additional activators that help it clean dirtier surfaces. Although a stronger cleaner, RMA Flux tends to leave more residue than pure Rosin flux types, so you’ll need to use flux removers or cleaners after the project is complete.

Rosin Activated (RA) Flux is the most activated rosin flux and is the best flux cleaner by far, but will leave significant residue behind that needs to be removed later. Otherwise, the corrosive residue might damage the PCB you’ve soldered. 

Water Soluble (Organic Acid Flux)

Organic acid flux—also referred to as water soluble flux—is typically made from glycol bases and is more reactive than rosin-activated flux. Water-soluble flux is a more aggressive oxidizer than rosin-activated flux and usually requires more clean-up afterward because of the leftover residue.

No-Clean Flux

No-Clean flux is made of organic resins (minus rosin) and other inorganic agents. The flux is referred to as “no-clean” either because the residue it leaves behind won’t affect electrical conductivity (requiring no clean-up), or the flux leaves no residue at all.

Solder Flux Forms

Flux comes in different compositions as well as different forms. 

Liquid flux is solder flux that, unsurprisingly, comes in liquid form. Liquid flux can help reduce surface tension to help the solder flow more uniformly and freely. For this reason, liquid solder is ideal for low-temperature soldering or wave soldering. 

Powder flux is typically only used for specialized applications like brazing (similar to soldering, but with higher temperatures). If you’re soldering electronics, chances are you won’t use powder flux. 

Flux Paste or Solder Flux Paste (or simply “Solder Paste”) is a mixture of tiny solder spheres (powdered solder) and flux. The combination of solder and flux into one pasty form allows users to clean and solder pieces together at the same time.  It’s commonly used for PCB assembly. Although still in paste form, solder paste can come in small flux paste syringes for better control during application. 

Flux Core or Rosin Core Solder is solder wire that has a thin core made of flux, usually rosin. Most modern solder used for PCB and electrical soldering comes with flux at the core. Like the flux paste, by combining solder and flux into one material, the deoxidation and soldering of components can occur at the same time. 

Flux Pens are prefilled pens of flux that can be held like a pencil and apply flux in small, controlled movements, much like you would highlight lines on a textbook. Flux pens can be cheaper and more convenient than standard bottles of liquid flux or solder paste. 

Flux Removers

Some flux leaves a high amount of residue that, if corrosive enough,  can end up short-circuiting, corroding, and ultimately destroying printed circuit boards you’ve soldered. To avoid this unfortunate outcome, spray or liquid flux removers are used after soldering to clean leftover flux residue. 

Corrosive or highly activated flux (like RMA or RA Rosin flux) often requires flux remover. Even No-Clean fluxes can leave a residue that, although not harmful, can look unattractive and messy if not cleaned up.

 

Note: Many chemical products, including any aerosol sprays and flammable liquids, must be shipped by ground service only and can not be shipped to Alaska or Hawaii or any overseas US territories or foreign countries.
  • Original price $10.85 - Original price $10.85
    Original price
    $10.85
    $10.85 - $10.85
    Current price $10.85

    No Clean Flux Paste

    MG Chemicals
    13 in stock

    No Clean Flux Paste Convenient syringe dispenser ideal for touch up and repair of surface mount assemblies. A unique mixture of high grade syntheti...

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    Original price $10.85 - Original price $10.85
    Original price
    $10.85
    $10.85 - $10.85
    Current price $10.85
  • Original price $7.95 - Original price $7.95
    Original price
    $7.95
    $7.95 - $7.95
    Current price $7.95

    8342 - RA Rosin Flux Paste

    MG Chemicals
    Currently on Backorder

    8342 - RA Rosin Flux Paste The 8342 RA Rosin Flux Paste is a superior, electronic grade flux paste that makes surface-mount, electrical, and electr...

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    Original price $7.95 - Original price $7.95
    Original price
    $7.95
    $7.95 - $7.95
    Current price $7.95
  • Original price $7.95 - Original price $7.95
    Original price
    $7.95
    $7.95 - $7.95
    Current price $7.95

    Rosin Flux Pen

    MG Chemicals
    13 in stock

    Rosin Flux Pen For precision application of rosin flux, in a convenient microtip pen format. RA type flux. Superior fluxing ability Instant wettin...

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    Original price $7.95 - Original price $7.95
    Original price
    $7.95
    $7.95 - $7.95
    Current price $7.95
  • Original price $21.92 - Original price $21.92
    Original price
    $21.92
    $21.92 - $21.92
    Current price $21.92

    Flux Remover for PC Boards - 33 oz. Liquid

    MG Chemicals
    13 in stock

    Flux Remover for PC Boards - 33 oz. Liquid Removes most types of organic rosin fluxes and ionic soils found in post-solder applications. Moderate ...

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    Original price $21.92 - Original price $21.92
    Original price
    $21.92
    $21.92 - $21.92
    Current price $21.92
  • Original price $1.88 - Original price $1.88
    Original price
    $1.88
    $1.88 - $1.88
    Current price $1.88

    Solder Flux (10ml)

    Circuit Specialists
    Out of stock

    Solder Flux (10ml) 10ml Useable with all standard solders

    Original price $1.88 - Original price $1.88
    Original price
    $1.88
    $1.88 - $1.88
    Current price $1.88
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  • Original price $1.33 - Original price $1.33
    Original price
    $1.33
    $1.33 - $1.33
    Current price $1.33

    Rosin Flux

    Circuit Specialists
    Out of stock

    Rosin Flux Protects the iron tip from oxidation to prolong tip life

    Original price $1.33 - Original price $1.33
    Original price
    $1.33
    $1.33 - $1.33
    Current price $1.33
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  • Original price $9.45 - Original price $9.45
    Original price
    $9.45
    $9.45 - $9.45
    Current price $9.45

    Flux Remover Pen

    MG Chemicals
    Out of stock

    A special blend of ethyl alcohol, isopropanol and ethyl acetate. Excellent for removing rosin, non-rosin, no clean fluxes, and ionic contamination....

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    Original price $9.45 - Original price $9.45
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    $9.45
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    Current price $9.45
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  • Original price $13.93 - Original price $13.93
    Original price
    $13.93
    $13.93 - $13.93
    Current price $13.93

    No Clean Water Washable Tack Flux For Lead and Lead-Free Rework 10cc Syringe

    CHIP QUIK
    Only 3 left!

    CHIP QUIK® SMD4300TF Tack Flux No Clean Water Washable For Lead and Lead-Free Rework 10cc Syringe w/ Handle & Tip Features: No Clean Water Was...

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    Original price $13.93 - Original price $13.93
    Original price
    $13.93
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    Current price $13.93
  • Original price $28.34 - Original price $28.34
    Original price
    $28.34
    $28.34 - $28.34
    Current price $28.34

    Lead Free Removal Alloy - SMD 4.5NL

    CHIP QUIK
    Currently on Backorder

    Lead Free Removal Alloy - SMD 4.5NL Simply by adding Chip Quik's Removal Alloy, normal solder will reflow at a safe low temperature below 300ºF (1...

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    Original price $28.34 - Original price $28.34
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    $28.34
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    Current price $28.34
  • Original price $77.93 - Original price $77.93
    Original price
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    $77.93 - $77.93
    Current price $77.93

    Lead Free Removal Alloy - SMD 16NL

    CHIP QUIK
    6 in stock

    Lead Free Removal Alloy - SMD 16NL Simply by adding Chip Quik's Removal Alloy, normal solder will reflow at a safe low temperature below 300ºF (15...

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    Original price $77.93 - Original price $77.93
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    Current price $77.93
  • Original price $13.89 - Original price $13.89
    Original price
    $13.89
    $13.89 - $13.89
    Current price $13.89

    ChipQuik SMD No Clean Paste Flux

    ChipQuik
    Only 2 left!

    CHIP QUIK® SMD-291 No Clean Flux in 10 cc. Syringe with Nozzle The same flux used in CHIP QUIK® SMD-1. Ideal for all rework solder & desolder ...

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    Original price $13.89 - Original price $13.89
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    $13.89
    $13.89 - $13.89
    Current price $13.89
  • Original price $41.75 - Original price $41.75
    Original price
    $41.75
    $41.75 - $41.75
    Current price $41.75

    Liquid Rosin Flux - 33 oz.

    MG Chemicals
    Only 2 left!

    Liquid Rosin Flux - 33 oz. For leaded and lead free soldering. Fully activated. Offers superior fluxing ability. Instant wetting. After soldering, ...

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    Original price $41.75 - Original price $41.75
    Original price
    $41.75
    $41.75 - $41.75
    Current price $41.75
  • Original price $10.95 - Original price $10.95
    Original price
    $10.95
    $10.95 - $10.95
    Current price $10.95

    Flux Remover Pen - 4140A-P

    MG Chemicals
    42 in stock

    Flux Remover Pen - 4140A-P The 4140A-P Flux Remover Pen cleans post solder residues quickly and conveniently. Its plastic safe formula removes rosi...

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    Original price $10.95 - Original price $10.95
    Original price
    $10.95
    $10.95 - $10.95
    Current price $10.95
  • Original price $87.65 - Original price $87.65
    Original price
    $87.65
    $87.65 - $87.65
    Current price $87.65

    Liquid Rosin Flux - 1 gal.

    MG Chemicals
    Only 1 left!

    No Clean Liquid Rosin Flux - 1 gal. For leaded and lead free soldering. Fully activated. Offers superior fluxing ability. Instant wetting. After so...

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    Original price $87.65 - Original price $87.65
    Original price
    $87.65
    $87.65 - $87.65
    Current price $87.65
  • Original price $9.95 - Original price $9.95
    Original price
    $9.95
    $9.95 - $9.95
    Current price $9.95

    Liquid Rosin Flux - 4 oz.

    MG Chemicals
    18 in stock

    Liquid Rosin Flux - 4 oz. For leaded and lead free soldering. Fully activated. Offers superior fluxing ability. Instant wetting. After soldering, t...

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    Original price $9.95 - Original price $9.95
    Original price
    $9.95
    $9.95 - $9.95
    Current price $9.95
  • Original price $17.55 - Original price $17.55
    Original price
    $17.55
    $17.55 - $17.55
    Current price $17.55

    Flux Remover for PC Boards - 14 oz. Aerosol

    MG Chemicals
    Only 1 left!

    Flux Remover for PC Boards - 14 oz. Aerosol Removes most types of organic rosin fluxes and ionic soils found in post-solder applications. Moderate...

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    Original price $17.55 - Original price $17.55
    Original price
    $17.55
    $17.55 - $17.55
    Current price $17.55
  • Original price $21.95 - Original price $21.95
    Original price
    $21.95
    $21.95 - $21.95
    Current price $21.95

    Heavy Duty Flux Remover - 16 oz. Aerosol

    MG Chemicals
    Currently on Backorder

    Heavy Duty Flux Remover - 16 oz. Aerosol Penetrates to quickly remove all non-ionic and ionic soils found in post-solder applications. evaporates ...

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    Original price $21.95 - Original price $21.95
    Original price
    $21.95
    $21.95 - $21.95
    Current price $21.95

Peruse Circuit Specialists' lineup of inexpensive solder flux and flux removers (liquid and aerosol). Our no-clean liquid rosin flux has superior fluxing ability — after soldering the rosin residue is non-corrosive, non-conductive, and moisture- and fungus-resistant. 

Circuit Specialists carries aerosol or liquid flux removers which clean all manner of organic rosin fluxes and ionic soils left over after soldering circuits which feature variable valves that allow you to control the rate of flow.

What is Solder Flux? 

Solder flux is a chemical cleaning agent that serves three key purposes in soldering:

  • Flux removes oxidated metals and corrosion from the surfaces you’re soldering
  • Flux coats and prevents surfaces from further oxidation 
  • Flux improves the wetting characteristics of solder

Without soldering flux, you run the risk of creating “cold” solder joints, which occur if oxidation is still present on the surfaces you’re soldering. Unclean, oxidized metal surfaces can also cause solder beads, which can short-circuit and damage surrounding components. 

Today, solder flux comes in a few different forms, including liquid and paste—some solder wires even contain flux cores. Solder flux also comes in various compositions, depending on the application you’re using it for. For example, it’s important to not confuse solder flux for electronics with acid flux types that are used for plumbing. 

Always check that the solder flux you’re purchasing is designed specifically for the project you’re using it for. 

Types of Solder Flux for Electronics

Rosin Flux

Rosin flux is made of natural rosin that’s extracted from the sap or resin of pine trees. Rosin contains the active ingredient abietic acid, which naturally cleans and deoxidizes surfaces. Other acid activators might be added to rosin to improve its cleaning abilities. Because of the varying levels of acidic activators, rosin flux actually comes in three key types:  

Rosin (R) Flux contains no added acid activators and is ideal for relatively clean surfaces and doesn’t leave residue behind.

Rosin Mildly Activated (RMA) Flux is Rosin flux with additional activators that help it clean dirtier surfaces. Although a stronger cleaner, RMA Flux tends to leave more residue than pure Rosin flux types, so you’ll need to use flux removers or cleaners after the project is complete.

Rosin Activated (RA) Flux is the most activated rosin flux and is the best flux cleaner by far, but will leave significant residue behind that needs to be removed later. Otherwise, the corrosive residue might damage the PCB you’ve soldered. 

Water Soluble (Organic Acid Flux)

Organic acid flux—also referred to as water soluble flux—is typically made from glycol bases and is more reactive than rosin-activated flux. Water-soluble flux is a more aggressive oxidizer than rosin-activated flux and usually requires more clean-up afterward because of the leftover residue.

No-Clean Flux

No-Clean flux is made of organic resins (minus rosin) and other inorganic agents. The flux is referred to as “no-clean” either because the residue it leaves behind won’t affect electrical conductivity (requiring no clean-up), or the flux leaves no residue at all.

Solder Flux Forms

Flux comes in different compositions as well as different forms. 

Liquid flux is solder flux that, unsurprisingly, comes in liquid form. Liquid flux can help reduce surface tension to help the solder flow more uniformly and freely. For this reason, liquid solder is ideal for low-temperature soldering or wave soldering. 

Powder flux is typically only used for specialized applications like brazing (similar to soldering, but with higher temperatures). If you’re soldering electronics, chances are you won’t use powder flux. 

Flux Paste or Solder Flux Paste (or simply “Solder Paste”) is a mixture of tiny solder spheres (powdered solder) and flux. The combination of solder and flux into one pasty form allows users to clean and solder pieces together at the same time.  It’s commonly used for PCB assembly. Although still in paste form, solder paste can come in small flux paste syringes for better control during application. 

Flux Core or Rosin Core Solder is solder wire that has a thin core made of flux, usually rosin. Most modern solder used for PCB and electrical soldering comes with flux at the core. Like the flux paste, by combining solder and flux into one material, the deoxidation and soldering of components can occur at the same time. 

Flux Pens are prefilled pens of flux that can be held like a pencil and apply flux in small, controlled movements, much like you would highlight lines on a textbook. Flux pens can be cheaper and more convenient than standard bottles of liquid flux or solder paste. 

Flux Removers

Some flux leaves a high amount of residue that, if corrosive enough,  can end up short-circuiting, corroding, and ultimately destroying printed circuit boards you’ve soldered. To avoid this unfortunate outcome, spray or liquid flux removers are used after soldering to clean leftover flux residue. 

Corrosive or highly activated flux (like RMA or RA Rosin flux) often requires flux remover. Even No-Clean fluxes can leave a residue that, although not harmful, can look unattractive and messy if not cleaned up.

 

Note: Many chemical products, including any aerosol sprays and flammable liquids, must be shipped by ground service only and can not be shipped to Alaska or Hawaii or any overseas US territories or foreign countries.

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