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                            Paste Solder Fluxes

                            Non-Corrosive Fluxes

                            See chart below. Fluxes are classified as Non-Corrosive when their residue after soldering will not corrode and eventually destroy the joint if allowed to remain. Generally incorporating a rosin base, these fluxes contain mild organic acids which are neutral at room temperature but become slightly acidic upon heating. Neutral, rosin fluxes are particularly useful in electrical applications, where their non-conductive, non-corrosive residue may be safely left on the assemblies.

                            Intermediate Fluxes

                            See chart below. These fluxes usually consist of mild organic salts, with considerably stronger fluxing action than non-corrosive types. Residue after soldering is normally not harmful to the soldered joint. However, residue should be removed whenever possible, as moisture in the atmosphere may initiate corrosion.

                            Corrosive Fluxes

                            See chart below. Most corrosive fluxes contain active inorganic acids and salts. Due to their increased strength and ability to quickly remove surface oxides, these fluxes are ideally suited to high-speed, automated soldering operations. Although corrosive fluxes generally produce the most reliable soldered joints, their residue after soldering must be removed, or it will eventually attack and destroy the joint.

                            * – Extended heating times can cause fluxes to oxidize prematurely

                            ** – Unusual service conditions may facilitate stress corrosion of certain brass parts joined with fluxes containing ammonia. Laboratory evaluation suggested.

                            LT – Laboratory testing is recommended due to widely varied metallurgical surface conditions.

                            Non-Corrosive

                            Flux
                            Type

                            Fluxing
                            Range*

                            Suggested
                            to
                            Remove Residue

                            Flow
                            Traits

                            Recommended
                            for Use On

                            Copper
                            & Brass**

                            Steel

                            Plated
                            Surfaces

                            Stainless
                            Steel

                            GPR

                            300-525°F
                            149-273°C

                            Mineral
                            Spirits or
                            Chlorinated
                            Hydrocarbon Solvent

                            Fair
                            Spread

                            Yes

                            No

                            LT

                            No

                            LPS

                            300-525°F
                            149-273°C

                            Mineral
                            Spirits or
                            Chlorinated
                            Hydrocarbon Solvent


                            Restrictive

                            Yes

                            No

                            LT

                            No

                            MBC

                            450-595°F
                            232-313°C

                            Mineral
                            Spirits or
                            Chlorinated
                            Hydrocarbon Solvent

                            Restrictive

                            Yes

                            No

                            LT

                            No

                            Intermediate

                            Flux Type

                            Fluxing Range*

                            Suggested to
                            Remove Residue

                            Flow Traits

                            Recommended for Use On

                            Copper & Brass**

                            Steel

                            Plated Surfaces

                            Stainless Steel

                            WC

                            300-525°F
                            149-273°C

                            Hot Water

                            Stays in place, little spread
                            until molten.

                            Yes

                            Mild
                            (LT)

                            Most
                            (LT)

                            (LT)

                            PMS

                            300-525°F
                            149-232°C

                            Hot Water

                            Stays in place, little spread
                            until molten.

                            Yes

                            Mild
                            (LT)

                            Most
                            (LT)

                            300 Series
                            (LT)

                            PWC

                            300-525°F
                            149-232°C

                            Hot Water

                            Stays in place, little spread
                            until molten.

                            Yes

                            Mild
                            (LT)

                            Most
                            (LT)

                            300 Series
                            (LT)

                            PA

                            300-450°F
                            149-232°C

                            Hot
                            Water

                            Stays
                            in place, little spread
                            until molten.

                            Yes

                            Mild
                            (LT)

                            Most
                            (LT)

                            300
                            Series
                            (LT)

                            PAN

                            125-300°F
                            52-149°C

                            Hot
                            Water

                            Stays in place, little spread
                            until molten.

                            Yes

                            Mild
                            (LT)

                            Most
                            (LT)

                            300 Series
                            (LT)

                            Corrosive

                            Flux
                            Type

                            Fluxing
                            Range*

                            Suggested
                            to
                            Remove Residue

                            Flow
                            Traits

                            Recommended
                            for Use On

                            Copper
                            & Brass**

                            Steel

                            Plated
                            Surfaces

                            Stainless
                            Steel

                            SSE

                            250-600°F
                            121-316°C

                            Hot
                            Detergent
                            Water

                            Stays
                            in place, little spread
                            until molten.

                            Yes

                            Most
                            (LT)

                            Most
                            (LT)

                            300&400
                            Series (LT)

                            SMH

                            300-600°F
                            149-316°C

                            Hot Detergent
                            Water

                            Stays in place, little spread
                            until molten.

                            Yes

                            Most
                            (LT)

                            Most
                            (LT)

                            300&400
                            Series (LT)

                            WCE

                            300-600°F
                            149-316°C

                            Hot Detergent
                            Water

                            Stays in place, little spread
                            until molten.

                            Yes

                            Most
                            (LT)

                            Most
                            (LT)

                            Most
                            (LT)


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