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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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