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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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