
Paste Solder Fluxes

| Non-Corrosive
Fluxes: 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: 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: 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. |
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
|
| * |
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. |
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)
|
| * |
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. |
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)
|
| * |
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. |
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