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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