Kester Acid Cored Wire Data Sheet
®
Acid Cored W
Acid Cored W
ire
ire
For Lead-bearing and Lead-free alloys
For Lead-bearing and Lead-free alloys
Product Description
Kester Acid Core is a highly active inorganic acid
type of flux developed for general-purpose
soldering applications where a flux-cored solder
wire is desirable. Rapid soldering can be
accomplished on all common met als except
aluminum and manganese. Acid flux is particularly
useful for soldering excessively oxidized met als.
Kester Acid Core possesses excellent thermal
stability to function under prolonged high
temperature conditions as with torch or flame
soldering. It is not recommended for electrical or
electronic soldering applications due to the
corrosive nature of the residue.
Performance Characteristics:
• Highest activity available
• Compatible with high temperature alloys
• Easy to clean
• Classified as INH1 per J-STD-004
RoHS Compliance
This product meets the requirements of the RoHS
(Restriction of Hazardous Subst ances) Directive,
2002/95/EC Article 4 for the st ated banned
substances. (Applies only if this core flux is
combined with a lead free alloy)
Suggested Alloys
50/50 and 40/60 - Tin/Lead:
General purpose - for non-electrical applications
such as galvanized gutters, sheet met al, radiator
repair and stained glass soldering.
96/4 - Tin/Silver:
High strength, non-t arnishing. Use for jewelry ,
plumbing and food service equipment rep airs.
Blends in well with stainless steel.
95/5 - Tin/Antimony:
For joining copper tubing in air-conditioning and
refrigeration equipment. Also for soldering copper
pipe and fittings for drinking water systems.
Application Notes
Availability:
Kester Acid Core is available in a wide variety of alloys, wire diameters and flux percentages. See suggestions
above for typical alloys and consult the alloy temperature chart in Kester ’s product cat alog for a
comprehensive alloy list. The st andard wire diameter for most applications is 1.00mm (0.031in). Wire
diameters range from 0.25 - 6.00mm (0.010 to 0.250in). A "Standard Wire Diameters" chart also is also
included i n Kester’s product cat alog. The amount of flux in the wire dict ates the ease of soldering for an
application. For most applications, core 66 (3.3% flux by weight) is recommended. Other core sizes, 50 and
58, (1.1% and 2.2% respectively) are available. Kester Acid Core is p ackaged on spools of dif ferent sizes
to accommodate a variety of applications.
Process Considerations:
Solder iron tip temperatures should range between 315-400°C (600-750°F) for suggested alloys. Heat both
surfaces to be soldered with the iron prior to adding Kester Acid cored wire. Apply the solder wire to a surface.
Do not apply the wire directly to the soldering iron tip. If needed, Kester 3350 Inorganic Acid Flux or SP-30
Soldering Paste Flux may be used as comp atible fluxes to aid in soldering joint s.
Cleaning:
The flux residue af ter soldering is hygroscopic and corrosive. The work should be allowed to cool
undisturbed until the solder solidifies. The flux residue is then removed with a hot water rinse. For more
thorough cleaning requirement s, rinse with a 2 - 10% solution of Kester 5760 Neutralizer followed by a
thorough hot water rinse.
For plumbing applications using Kester SP-30 Soldering Paste Flux, simply wipe off the residue with a damp
cloth. This may be followed by a hot water rinse.
Storage, Handling, and Shelf Life:
Storage must be in a dry , non-corrosive environment. The surface may lose it s shine and appear a dull
shade of grey. This is a surface phenomena and is not detrimental to product functionality. Flux cored solder
wire has a limited shelf life determined by the alloy used in the wire. For alloys cont aining > 70% lead, the
shelf life is two years from date of manufacture. Other alloys have a shelf life of three years from date of
manufacture.
Health & Safety:
This product, during handling or use, may be hazardous to health or the environment. Read the Material
Safety Data Sheet and warning label before using this product.
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